The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics
Purpose: The question of the influence of modes of excitation of disk monopole antennas of microstrip topology on the antenna general properties is considered. The purpose of work consists in determination of the optimum method of antenna excitation for increasing the antenna matching level with the...
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| Цитувати: | The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics / S.A. Pogarsky, L.M. Lytvynenko, D.V. Mayboroda, A.V. Poznyakov // Радиофизика и радиоастрономия. — 2018. — Т. 23, № 2. — С. 128-136. — Бібліогр.: 21 назв. — англ. |
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irk-123456789-1501822019-04-03T01:25:22Z The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics Pogarsky, S.A. Lytvynenko, L.M. Mayboroda, D.V. Poznyakov, A.V. Антенны, волноводная и квазиоптическая техника Purpose: The question of the influence of modes of excitation of disk monopole antennas of microstrip topology on the antenna general properties is considered. The purpose of work consists in determination of the optimum method of antenna excitation for increasing the antenna matching level with the external microwave chains and its influence on the antenna energy characteristics. Предмет и цель работы: Рассматривается вопрос о влиянии способов возбуждения дисковой монопольной антенны микрополосковой топологии на основные характеристики антенны. Цель работы состоит в определении оптимального способа возбуждения антенны для повышения уровня согласования антенны с внешними СВЧ цепями и его влияния на энергетические характеристики антенны. Предмет і мета роботи: Розглядається питання про вплив способів збудження дискової монопольної антени мікросмужкової топології на основні характеристики антени. Мета роботи полягає у визначенні оптимального способу збудження антени для підвищення рівня узгодження антени із зовнішніми НВЧ ланцюгами і його впливу на енергетичні характеристики антени. 2018 Article The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics / S.A. Pogarsky, L.M. Lytvynenko, D.V. Mayboroda, A.V. Poznyakov // Радиофизика и радиоастрономия. — 2018. — Т. 23, № 2. — С. 128-136. — Бібліогр.: 21 назв. — англ. 1027-9636 PACS number: 84.40.Ba DOI: https://doi.org/10.15407/rpra23.02.128 http://dspace.nbuv.gov.ua/handle/123456789/150182 en Радиофизика и радиоастрономия Радіоастрономічний інститут НАН України |
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Антенны, волноводная и квазиоптическая техника Антенны, волноводная и квазиоптическая техника |
| spellingShingle |
Антенны, волноводная и квазиоптическая техника Антенны, волноводная и квазиоптическая техника Pogarsky, S.A. Lytvynenko, L.M. Mayboroda, D.V. Poznyakov, A.V. The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics Радиофизика и радиоастрономия |
| description |
Purpose: The question of the influence of modes of excitation of disk monopole antennas of microstrip topology on the antenna general properties is considered. The purpose of work consists in determination of the optimum method of antenna excitation for increasing the antenna matching level with the external microwave chains and its influence on the antenna energy characteristics. |
| format |
Article |
| author |
Pogarsky, S.A. Lytvynenko, L.M. Mayboroda, D.V. Poznyakov, A.V. |
| author_facet |
Pogarsky, S.A. Lytvynenko, L.M. Mayboroda, D.V. Poznyakov, A.V. |
| author_sort |
Pogarsky, S.A. |
| title |
The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics |
| title_short |
The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics |
| title_full |
The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics |
| title_fullStr |
The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics |
| title_full_unstemmed |
The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics |
| title_sort |
influence of a circular-patch monopole antennas excitation method on their integral characteristics |
| publisher |
Радіоастрономічний інститут НАН України |
| publishDate |
2018 |
| topic_facet |
Антенны, волноводная и квазиоптическая техника |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/150182 |
| citation_txt |
The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics / S.A. Pogarsky, L.M. Lytvynenko, D.V. Mayboroda, A.V. Poznyakov // Радиофизика и радиоастрономия. — 2018. — Т. 23, № 2. — С. 128-136. — Бібліогр.: 21 назв. — англ. |
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Радиофизика и радиоастрономия |
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ISSN 1027-9636. Радіофізика і радіоастрономія. Т. 23, № 2, 2018128
Радіофізика і радіоастрономія. 2018, Т. 23, № 2, c. 128–136
© S. A. Pogarsky, L. M. Lytvynenko, D. V. Mayboroda,
A. V. Poznyakov, 2018
ÀÍÒÅÍÈ, ÕÂÈËÅÂÎÄÈ
² ÊÂÀDzÎÏÒÈ×ÍÀ ÒÅÕͲÊÀ
S. A. POGARSKY 1, L. M. LYTVYNENKO 2,
D. V. MAYBORODA 1, A. V. POZNYAKOV 1
1 V. N. Karazin Kharkiv National University,
4, Svoboda Sq., Kharkiv, 61022, Ukraine
E-mail: spogarsky@gmail.com
2 Institute of Radio Astronomy,
National Academy of Sciences of Ukraine,
4, Mystetstv St., Kharkiv, 61002, Ukraine
THE INFLUENCE OF A CIRCULAR-PATCH MONOPOLE ANTENNAS
EXCITATION METHOD ON THEIR INTEGRAL CHARACTERISTICS
Purpose: The question of the influence of modes of excitation of disk monopole antennas of microstrip topology on the antenna
general properties is considered. The purpose of work consists in determination of the optimum method of antenna excitation
for increasing the antenna matching level with the external microwave chains and its influence on the antenna energy charac-
teristics.
Design/methodology/approach: The modeling of antenna general properties is made by using the finite element method (FEM).
The modeling is carried out within the model of a half-open resonator formed by the two metal surfaces (a grounded base and
just a strip conductor), on which the condition of electric wall is fulfilled, and also by the cylindrical surface on which the condition
of magnetic wall is fulfilled. In modeling, usually the thin substrate resh is assumed, where h is a substrate thickness, res
being the resonance wave-length in a resonator. For such an assumption we may affirm that the vector of an electric field
in a resonator will not have variations along the coordinate being perpendicular to the structure plane, and in the resonator,
the prevailing types of oscillations will be oscillations .mn0 mn0E (TM ) In modeling, special attention has been paid to the mutual
coupling of just a disk resonator and the resonator formed by a coaxial line segment.
Findings: The information on the influence of the mode of excitation of disk monopole antenna with microstrip topology on the
antenna general properties: spectral characteristics, degree of antenna matching with external chains, and energy characteristics
with variation of substrate dielectric constant values is obtained.
Conclusions: The data obtained testify that the monopole disk microstrip resonators with the complex-composite topology
of radiators can provide a high level of integral characteristics and form the radiated fields with the required characteristics.
Key words: disk microstrip resonator, slot radiator, mode of excitation, matching, directivity diagram
DOI: https://doi.org/10.15407/rpra22.03.128
PACS number: 84.40.Ba
1. Introduction
This paper is an extension of work originally presen-
ted in 2017 at the XI International Conference on
Antenna Theory and Techniques (ICATT) [1] and
describes new results in the field of microwave and
wireless technologies.
Microstrip antennas, due to their lightweight, com-
pact size, conformable structure and ease of fabrica-
tion, have found wide application in various fields.
They are widely used in many communication sys-
tems as independent transmitting or receiving an-
tennas, and as elements of phased array antennas.
In particular, microstrip antenna is used as a re-
ceiving antenna in user’s apparatus of space na-
vigation systems (GPS (Global Positioning Sys-
tem), GLONASS (Global Navigation Satellite Sys-
tem), etc.) [2], in modern wireless communication
systems [3], etc. Other fields of applications should
be mentioned such as medical therapy [4], elements
of microstrip devices (filters [5], hybrid junctions [6],
circulators [7], etc.).
Recently, applications in military radio technology
have become an important subject of microwave
communication [8]. For these applications, a set of
different (and sometimes contradictory) requirements
ISSN 1027-9636. Радіофізика і радіоастрономія. Т. 23, № 2, 2018 129
The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics
is presented. They have to be compact, extremely
wideband and to provide the ability to receive and
transmit signals accounting for the possible rapid
movement of the object and thus possible frequency
changes due to the Doppler effect.
The canonical forms of microstrip antennas are
rectangular and circular resonators and their various
modifications operating at the lowest modes. Each
of topology realization has its own advantages and
disadvantages. For example, a rectangular patch
design topology has resonant wavelengths propor-
tional to 1 r ( r means relative permittivity of a
substrate material). It allows to use substrates with large
values of permittivity and thus to reduce the geometrical
antenna dimensions at required frequencies.
Antennas with axially symmetric type topology
(circular, annular, and their modifications) have cer-
tain advantages as against antennas with a rectan-
gular topology. A wide operating frequency band
and the possibility of radiation with an elliptical (cir-
cular) polarization are the two most significant.
At the same time, the designs based on these topo-
logies have a significant defect. In these structures,
the degenerated modes may be excited that can be
result in technical difficulties in maintaining a sin-
gle-mode operation and polarization stability in a
given frequency band. In axially symmetrical reso-
nating structures, multiple degenerated eigenmodes
are observed because of the presence of infinite
symmetry around the rotation center (axis of sym-
metry equals )C [9]. The information on suffi-
ciently simple and technological ways of controlling
the spectral composition of the excited oscillations
can be found. Among them, one can point to the
methods based on changing the structure of the
current lines on the patch surface [10], and to
methods based of the effect on the so-called phase
excitation centers [11, 12].
Analysis of information cited in studies that have
already became classical [13–15] shows that the
problems of excitation of microstrip structures and
matching them with external circuits have received
much attention. The aforementioned studies focused
mostly on matching by the use of 3D elements (shor-
ting vias). These studies lack data on spectral inter-
actions between two primary parts of a structure,
namely a resonator and an exciting element. Due to
finiteness of geometrical dimensions of exciting ele-
ments and the possibility of appearance of resonan-
ces in these elements, the spectral interactions factor
can’t be ignored in the process of designing highly
efficient antenna systems.
There were attempts to create models for simula-
tions of an input impedance value, matching and fre-
quency tuning of microstrip antennas [16–20]. They
also have not accounted for the factor of possible
occurrence of resonance effects and its influence on
integral characteristics of antennas. Reviewed lite-
rature also lacks information on the influence of re-
latively small deviations of values of a dielectric
permittivity on amplitude-frequency and other cha-
racteristics of antennas with various technological
methods of antennas excitation.
Obviously, a detailed analysis of the influence of
various technological factors on the most important
antenna characteristics is very important.
In this regard, an attempt was made to fill such
gaps. The goal of this study was to identify more
subtle mechanisms of the influence of various tech-
nological factors on the most important characteris-
tics of circular-patch monopole antennas.
2. Models under Study
Now let us study a microstrip disk patch antenna with
discontinuities in the form of log-periodic slot line seg-
ments being excited by different methods shown in
Fig. 1(a)–1(c). Elements of discontinuities fulfil con-
ditions of the log-periodic law, that is, the distance
between the elements and the size of the cell changes
are decreasing up to geometric progression with a gi-
ven denominator. In Fig. 1(a), the patch antenna is
excited with a coaxial line segment. In Fig. 1(a), the
following notations are used: 1 – grounded plane, 2 –
dielectric substrate, 3 – disk patch, 4 – exciting seg-
ment of a coaxial line.
In Fig. 1(b) the structure is excited with a micros-
trip line segment. In addition, Fig. 1(c) shows the
structure excited with a coplanar line. Each excita-
tion method has certain electrodynamic and technical
advantages. Thus, excitation with a coaxial line al-
lows to excite the axially symmetric types of oscilla-
tion quite easily.
Excitation with a microstrip and coplanar lines
makes it possible to match the antenna with ex-
ternal circuits without any technical tricks. Further-
more, the excitation with a coplanar line allows to
achieve the radiation from both sides of the substra-
te (to achieve the radiation from both sides of the
aperture).
130 ISSN 1027-9636. Радіофізика і радіоастрономія. Т. 23, № 2, 2018
S. A. Pogarsky et al.
The used parameters of a structure under study
are as follows: dielectric substrate is FLAN-3.8
( 3.8)r with thickness of 0.5h mm, disk patch
with diameter of 35d mm, the angle between
neighbouring segments is 120 (between axes of
channels of a log-periodic structure). In the first case,
the exciting segment of a coaxial line has the cross
section of 7.5 3.8 mm and wave resistance 50 .
In other cases, the parameters of exciting elements
have been taken with account for matching with
external circuits. It will be observed that in the case
of coplanar excitation, there is a too large difference
between the values of the wave resistance of the
coplanar line and the input resistance of the patch,
the coplanar transition is made in a stepwise form.
In all cases, the values of dielectric constant are
variable.
As can be seen from the ratio of the parameters,
the substrate has been assumed to be thin ( ),rh
wherein h is the substrate thickness, r is the re-
sonant wavelength in the cavity. If such assumptions
are made, it can be argued that the vector of an
electric field in the resonator has no variations along
the direction perpendicular to the structure plane and
the cavity oscillation modes 0 0( )mn mnE TM are pre-
valent oscillations.
3. Results of Investigation
The key issues in the study of any microstrip struc-
ture with canonical topology of the patch are eigen-
mode spectrum, influence of internal parameters on
integral characteristics, broadbandness of operation,
and – if it is a radiating structure – the form and cha-
racteristics of patterns. By the FEM (Finite Element
Method), the eigenmode spectra of a complicated
structure for different methods of excitation are in-
vestigated.
Fig. 2 shows the spectrum of a canonical disk
resonator. The concentration of spectral lines can be
observed in the frequency range above 5 GHz. In the
frequency range above 6 GHz, there is a large num-
ber of degenerated modes (in Fig. 2 they are shown
with the thickened spectral lines).
Fig. 3 shows the spectrum of object with three
discontinuities in the form of segments of log-perio-
dic structure with a coaxial segment. It will be ob-
served that in any case a disk patch with disconti-
nuities and an element of excitation will together make
a system of coupled resonators. The relationship
between the resonant frequencies and the coupling
magnitude will determine the actual spectral charac-
teristics. In the case of excitation with a coaxial
segment, the rarefying of eigenmodes spectrum can
Fig. 1: A structure with coaxial excitation shown schematically
(a), topology of the structure with microstrip excitation (b),
and topology of the structure with coplanar excitation (c)
ISSN 1027-9636. Радіофізика і радіоастрономія. Т. 23, № 2, 2018 131
The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics
be noted. Only two spectral lines at frequencies
5.0003F GHz and 5.0333F GHz are sufficiently
close but not degenerated. This fact is confirmed by
the current structure on the patch obtained by nu-
merical simulations.
Fig. 4 shows the spectrum of an object excited by
a segment of microstrip line.
Here, a sufficiently rarefied spectrum in the entire
frequency band can be found. Only two spectral lines
at frequencies 6.144F GHz and 8.012F GHz
are degenerated.
Fig. 5 shows the spectrum characteristic of a struc-
ture with coplanar element of excitation. A suffi-
ciently large number of spectral lines can be seen.
They are distributed rather unevenly on the frequen-
cy axis. Degenerated modes are observed in the
frequency band above 7 GHz.
It is a well known fact that all parameters of mi-
crostrip devices depend essentially on the internal
parameters, first of all, on the permittivity value of a
dielectric substrate. This parameter is of particular
importance in cases where discontinuities which change
the structure of currents on the patch are present.
In addition, an important role is played by the method
of excitation of the structure, more precisely, by the
presence of additional functional elements. The per-
mittivity value on influence 11S in the frequency range
will determine both degree of antenna matching with
external circuits and radiation efficiency at certain fre-
quencies. Dependencies of 11S vs. frequency with
variation of the relative permittivity values in case of
a coaxial excitation (Fig. 1(a)) are shown in Fig. 6.
As can be seen, the minimum of 11S is observed
for 3.7r at 5.75F GHz with an absolute value
Fig. 4: Spectrum of the structure with three discontinuities
and a segment of microstrip line
Fig. 5: Spectrum of the structure with three discontinuities
and a segment of coplanar line
Fig. 3: Spectrum of the structure with three discontinuities and
a segment of coaxial line
Fig. 2: Spectrum of a canonical microstrip disk resonator
132 ISSN 1027-9636. Радіофізика і радіоастрономія. Т. 23, № 2, 2018
S. A. Pogarsky et al.
of 0.11 that is equivalent to voltage standing wave
ratio 1.247.VSWR This frequency corresponds to
the frequency of one of the degenerated modes of a
canonical microstrip disk resonator (Fig. 2). It will be
observed that this absolute minimum can be seen in
a very narrow frequency band. A small change in the
relative dielectric constant to the design value of
3.8r (about 2.6 %) shifts the minimum value of
11S to a low frequency region. The resonant fre-
quency is almost equal to the frequency of the spec-
tral line of one of the eigenmodes of a disk with log-
periodic discontinuities (Fig. 3). The bandwidth in this
case practically does not change, but the value of
11S itself rises to the level of 0.36 (equivalent to the
value of 2.125).VSWR Further increasing of the
relative dielectric permittivity value to 3.9r leads
to a further shift into a low frequency band and in-
creases the 11S level. We may assume that at fre-
quencies close to the minima of the reflection coef-
ficient, an effective radiation can be detected.
However, in the low frequency band (near
4.75 4.85 GHz), where the 410 410( )E TM mode is
excited, there are resonances with a relatively low
level of reflection (not exceeding the level of 0.45).
Resonances at these frequencies are not so sharp,
that is, the bandwidth here is wider.
Fig. 7 shows the changes of 11S with variations of
the r value within 3.7 to 3.9 for the case of a struc-
ture excitation using the segment of microstrip line
(Fig. 1(b)). As can be seen, there are some changes
with respect to the first case (Fig. 6). All the depen-
dences show a shift to the low-frequency region by
about 1 GHz. There is also a small frequency shift
down the frequency with increasing value of .r The
magnitude of the absolute minimum of 11S has slight-
ly increased. At the same time, there are two more
frequency bands in the considered frequency domain,
within which small values of 11S are observed.
Typical is the frequency band from 5.5 to 6.5 GHz.
In this band, sufficiently strong oscillations of 11S
values are observed, that is the result of resonant
phenomena in a microstrip line segment. The seg-
ment length is 12.5l mm, the average frequency
of the interval is 6 GHz, the obtained value of
1.688,eff the ratio is 0.42,l i.е. the situation
is close to the resonant one.
Fig. 8 shows the changes of 11S vs. frequency
with variations of the r value for coplanar excita-
tion case. The dependencies have substantial diffe-
rences from the earlier considered cases. Obviously,
there is no principle dependence of 11S vs. r in the
frequency band from 1 to 14 GHz. The noticeable
pulsations are observed in the high-frequency band.
The resonant phenomena associated with the finite-
ness of the segment of an exciting element are ob-
served in a higher frequency range. Taking into ac-
count the nature of the characteristic, one can expect
the effective radiation of a structure in two bands,
one of which being a sufficiently low-frequency.
The results of numerical simulations of energy
characteristics are shown in Fig. 9. Fig. 9 shows the
elevation pattern characteristic for 4.78F GHz
and 5.74F GHz being normal with respect to the
plane of the disk resonator structure. Characteristics
Fig. 6: Dependencies of 11S vs. frequency with variation
of the r value for a coaxial excitation case
Fig. 7: Dependencies of 11S vs. frequency with variation
of the r value for a microstrip excitation case
ISSN 1027-9636. Радіофізика і радіоастрономія. Т. 23, № 2, 2018 133
The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics
are double-lobe, because microstrip patch is excited
by a non-axially symmetric mode. Both characteris-
tics are represented in absolute values. This represen-
tation gives an indication of the radiation efficiency.
As expected, more effective radiation was found at
the frequency for which minimum reflectance is ob-
served. Comparison of both characteristics shows
that at 5.74F GHz the radiated power is much
more effective. In addition, at this frequency the
angular dimensions of lobes with an effective radia-
tion are substantially wider.
Fig. 10 shows the pattern characteristics of a struc-
ture with microstrip excitation for 4.86F GHz.
This frequency corresponds to the minimum value of
11S (see Fig. 7).
Curve 10a shows the elevation characteristic (with
the azimuth angle of 0 ) and curve 10b shows the
azimuthal dependence. Both characteristics are sin-
gle-lobe. The elevation dependence had small oscil-
lations of radiated power. The fluctuations are ob-
served at angles, which determine the position of the
longitudinal axes of segments of the meander line on
the patch surface. The difference in the radiated
power varies insignificantly.
Fig. 11 shows the pattern characteristics of a struc-
ture with coplanar excitation for 1.66F GHz.
Curve 11a corresponds to the elevation characte-
ristic (with the azimuth angle of 90 ) and curve 11b
shows the azimuthal dependence. Both characteris-
tics are double-lobe. It will be observed that the ra-
diation level from the side of a substrate free of
metallization is somewhat larger. In addition, the
angular width with the maximum of a radiation also
turns out to be wider. Both observed facts are ex-
plained by the influence of a dielectric substrate,
which ensures the redistribution of the electromag-
netic field to the side of aperture with a large value
of permittivity.
4. Conclusions
Thus, the studies of complicated structures being
microstrip objects with complex configuration of dis-
continuities, show that in order to design the effective
radiating systems, it is necessary to take into account a
number of important factors. The first one is the in-
fluence of material characteristics of the substrate on
radiation characteristics. Accounting for the fact that
there are no perfect dielectrics, they always have dif-
ferent kinds of defects, including deviation from the
desired ,r it is an important factor in designing the
radiators, which can be well matched to external cir-
Fig. 8: Dependencies of 11S vs. frequency with variation
of the r value for a coplanar excitation case
Fig. 9: Elevation pattern characteristic for a coaxial excitation case: curve a – 4.78F GHz, curve b – 5.74F GHz
134 ISSN 1027-9636. Радіофізика і радіоастрономія. Т. 23, № 2, 2018
S. A. Pogarsky et al.
cuits at one or several frequencies or in a certain fre-
quency band. The second one is the influence of exci-
tation method on spectral and radiation characteristics.
The influence on both characteristics is explained by
the fact that a circular-patch monopole (with disconti-
nuities) and a segment of an exciting line represent two
independent resonating systems. Besides, in exciting
elements may be observed resonance effects asso-
ciated with finiteness of their dimensions. The ratio of
the resonant frequencies has a significant effect on the
spectral characteristics. Moreover, the ratio of Q-fac-
tors has a significant effect on the radiation characte-
ristics too. Consideration of the influence of these fac-
tors makes it possible to design the effective radiating
systems with predictable characteristics. Use of exci-
tation with a segment of coplanar line allows to achieve
effective radiation in the low frequency range. Use of
other methods of excitation fails to realize effective
Fig. 10: Pattern characteristic for a microstrip excitation case
Fig. 11: Pattern characteristic for a coplanar excitation case
ISSN 1027-9636. Радіофізика і радіоастрономія. Т. 23, № 2, 2018 135
The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics
radiation in this frequency range with the same geo-
metric dimensions of the structure.
The results of investigations have allowed to design
a sample of the antenna being patented in Ukraine [21].
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С. А. Погарский 1, Л. Н. Литвиненко 2, Д. В. Майборода 1,
А. В. Позняков 1
1 Харьковский национальный университет
имени В. Н. Каразина,
пл. Свободы, 4, г. Харьков, 61022,Украина
2 Радиоастрономический институт НАН Украины,
ул. Мистецтв, 4, г. Харьков, 61002, Украина
ВЛИЯНИЕ СПОСОБОВ ВОЗБУЖДЕНИЯ ДИСКОВЫХ
МОНОПОЛЬНЫХ АНТЕНН НА ИХ ОСНОВНЫЕ
ХАРАКТЕРИСТИКИ
Предмет и цель работы: Рассматривается вопрос о влия-
нии способов возбуждения дисковой монопольной антенны
микрополосковой топологии на основные характеристики
антенны. Цель работы состоит в определении оптимального
способа возбуждения антенны для повышения уровня со-
гласования антенны с внешними СВЧ цепями и его влияния
на энергетические характеристики антенны.
Методы и методология: Моделирование основных харак-
теристик антенны осуществлено с использованием метода
конечных элементов (FEM). Моделирование проведено
в рамках модели полуоткрытого резонатора, образованного
двумя металлическими поверхностями (заземленное основа-
ние и собственно полосковый проводник), на которых вы-
полняется условие электрической стенки, и цилиндрической
поверхностью, на которой выполняется условие магнитной
стенки. При моделировании обычно вводят предположение
тонкой подложки ,resh где h – толщина подложки,
res – резонансная длина волны в резонаторе. При такогоо
рода предположении можно утверждать, что вектор элект-
136 ISSN 1027-9636. Радіофізика і радіоастрономія. Т. 23, № 2, 2018
S. A. Pogarsky et al.
рического поля в резонаторе не будет иметь вариаций вдоль
координаты, перпендикулярной плоскости структуры,
а в резонаторе превалирующими типами колебаний будут
колебания 0 0( ).mn mnE TM При моделировании особое внима-
ние уделено взаимному влиянию собственно дискового ре-
зонатора и резонатора, образованного отрезком коаксиаль-
ной линии.
Результаты: Получены данные о влиянии способа возбуж-
дения дисковой монопольной антенны с микрополосковой
топологией на основные характеристики антенны: спектраль-
ные характеристики, степень согласования антенны с вне-
шними цепями и энергетические характеристики при вариа-
ции значений относительной диэлектрической проницаемос-
ти подложки.
Заключение: Полученные данные свидетельствуют о том, что
монопольные дисковые микрополосковые резонаторы со слож-
нокомпозиционной топологией излучателей могут обеспечи-
вать высокий уровень интегральных характеристик и форми-
ровать излучаемые поля с требуемыми характеристиками.
Ключевые слова: дисковый микрополосковый резонатор,
щелевой излучатель, способ возбуждения, согласование,
диаграмма направленности
С. О. Погарський 1, Л. М. Литвиненко 2, Д. В. Майборода 1,
А. В. Позняков 1
1 Харківський національний університет
імені В. Н. Каразіна,
м. Свободи, 4, м. Харків, 61022, Україна
2 Радіоастрономічний інститут НАН України,
вул. Мистецтв, 4, м. Харків, 61002, Україна
ВПЛИВ СПОСОБІВ ЗБУДЖЕННЯ ДИСКОВИХ
МОНОПОЛЬНИХ АНТЕН
НА ЇХ ОСНОВНІ ХАРАКТЕРИСТИКИ
Предмет і мета роботи: Розглядається питання про вплив
способів збудження дискової монопольної антени мікросмуж-
кової топології на основні характеристики антени. Мета ро-
боти полягає у визначенні оптимального способу збудження
антени для підвищення рівня узгодження антени із зовніш-
німи НВЧ ланцюгами і його впливу на енергетичні характе-
ристики антени.
Методи і методологія: Моделювання основних характери-
стик антени здійснене з використанням методу кінцевих еле-
ментів (FEM). Моделювання виконано в рамках моделі на-
піввідкритого резонатора, утвореного двома металевими по-
верхнями (заземлена основа та власне смужковий провідник),
на яких виконується умова електричної стінки, та цилінд-
ричною поверхнею, на якій виконується умова магнітної
стінки. При моделюванні зазвичай вводять припущення тон-
кої підкладки ,resh де h – товщина підкладки, res –
резонансна довжина хвилі в резонаторі. За таким припущен-
ням можна стверджувати, що вектор електричного поля
в резонаторі не матиме варіацій уздовж координати, перпен-
дикулярної площині структури, а в резонаторі переважаю-
чими типами коливань будуть коливання 0 0( ).mn mnE TM
При моделюванні особливої уваги приділено взаємному впли-
ву власне дискового резонатора і резонатора, утвореного
відрізком коаксіальної лінії.
Результати: Отримано дані про вплив способу збудження
дискової монопольної антени з мікросмужковою топологією
на основні характеристики антени: спектральні характерис-
тики, міра узгодження антени із зовнішніми ланцюгами і енер-
гетичні характеристики при варіації значень відносної діе-
лектричної проникності підкладки.
Висновок: Отримані дані свідчать про те, що монопольні
дискові мікросмужкові резонатори із складнокомпозиційною
топологією випромінювачів можуть забезпечувати високий
рівень інтегральних характеристик і формувати випроміню-
вані поля з необхідними характеристиками.
Ключові слова: дисковий мікросмужковий резонатор, щілин-
ний випромінювач, спосіб збудження, узгодження, діаграма
спрямованості
Received 17.05.2018
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