The article investigates a compact annular antenna array with a circular radiation pattern in the horizontal plane with horizontal polarization of the radiation field. The antenna consists of four frame (loop) radiators arranged in a circle. Each loop radiator is shaped as a sector of a circle. The antenna array is powered by a quarter-wave transformer with a characteristic impedance of 25 ohms. The antenna diameter is close to 0.25λ, the perimeter of each loop radiator is 0.45λ. The irregularity of the antenna directional pattern in the plane of vector E is no greater than 0.1 dB. In the vertical plane, the radiation has a figure eight pattern. The antenna’s operating bandwidth is 5.1%. Experimental radiation patterns in the plane of vectors E and H are shown.

Topics
Transformer, Antennas
1.
Z.-Y.
 
Zhang
,
Y.
 
Zhao
,
S.
 
Zuo
,
L.
 
Yang
,
L.
 
Ji
, and
G.
 
Fu
,
IEEE Transactions on Antennas and Propagation
 
66
,
2229
–
2235
(
2018
).
https://doi.org/10.1109/TAP.2018.2810338
Google Scholar
Crossref
Search ADS
 
2.
Z.
 
Wang
,
Y.
 
Yin
,
X.
 
Yang
 and
J.
 
Wu
,
IEEE Transactions on Antennas and Propagation
 
63
,
3311
–
3316
(
2015
).
https://doi.org/10.1109/TAP.2015.2429733
Google Scholar
Crossref
Search ADS
 
3.
X. L.
 
Quan
,
R. L.
 
Li
,
J. Y.
 
Wang
, and
Y. H.
 
Cui
,
Progress in Electromagnetics Research
 
128
,
441
–
456
(
2012
).
https://doi.org/10.2528/PIER12042405
Google Scholar
Crossref
Search ADS
 
4.
L. H.
 
Ye
,
Y.
 
Zhang
,
X.
 
Yin
 Z. and
Q.
 
Xue
,
IEEE Transactions on Antennas and Propagation
 
67
,
2792
–
2797
(
2019
).
https://doi.org/10.1109/TAP.2019.2894030
Google Scholar
Crossref
Search ADS
 
5.
H.-Y.
 
Zhang
,
F.-S.
 
Zhang
,
F.
 
Zhang
,
T.
 
Li
,
C.
 
Li
,
IEEE Antennas and Wireless Propagation Letters
 
16
,
880
–
883
(
2017
).
https://doi.org/10.1109/LAWP.2016.2613875
Google Scholar
Crossref
Search ADS
 
6.
Y.
 
Yu
,
F.
 
Jolani
,
Z.
 
Chen
,
IEEE Antennas and Wireless Propagation Letters
 
12
,
686
–
689
(
2013
).
https://doi.org/10.1109/LAWP.2013.2264545
Google Scholar
Crossref
Search ADS
 
7.
C.-H.
 
Ahn
,
S.-W.
 
Oh
, and
K.
 
Chang
,
IEEE Antennas and Wireless Propagation Letters
 
8
,
966
–
969
(
2009
).
https://doi.org/10.1109/LAWP.2009.2030135
Google Scholar
Crossref
Search ADS
 
8.
T.
 
Liu
,
H.
 
Yang
,
Y.
 
He
 and
J.
 
Lu
,
AEU - International Journal of Electronics and Communications
 
90
,
123
–
129
(
2018
).
https://doi.org/10.1016/j.aeue.2018.04.006
Google Scholar
Crossref
Search ADS
 
9.
W.
 
Bhowmik
,
S.
 
Srivastava
,
International Journal of Electronics and Communications
 
108
,
29
–
35
(
2019
).
https://doi.org/10.1016/j.aeue.2019.05.036
Google Scholar
Crossref
Search ADS
 
10.
T. S. P.
 
See
,
X.
 
Qing
,
Z. N.
 
Chen
,
IEEE 4th Asia Pacific Conferences on Antennas and Propagation
,
294
–
295
(
2015
).
Google Scholar
 
11.
H.
 
Liu
,
Y.
 
Liu
,
W.
 
Zhang
,
S.
 
Gao
,
IEEE Transactions on Antennas and Propagation
 
65
,
4351
–
4356
(
2017
).
https://doi.org/10.1109/TAP.2017.2717959
Google Scholar
Crossref
Search ADS
 
12.
K.
 
Wei
,
Z.
 
Zhang
,
Z.
 
feng
,
IEEE Antennas and Wireless Propagation Letters
 
11
,
49
–
52
(
2012
).
https://doi.org/10.1109/LAWP.2012.2182670
Google Scholar
Crossref
Search ADS
 
13.
W.W.
 
Li
,
K.W.
 
Leung
,
IEEE Transactions on Antennas and Propagation
 
61
,
4246
–
4256
(
2013
).
https://doi.org/10.1109/TAP.2013.2262072
Google Scholar
Crossref
Search ADS
 
14.
X.
 
Li
,
J.
 
Liao
,
Y.
 
Yuan
,
D.
 
Yu
,
Microwave Conference
,
2401
–
2404
(
2010
).
Google Scholar
 
This content is only available via PDF.
© 2022 Author(s).
2022
Author(s)
You do not currently have access to this content.