A Millimeter-Wave TE
20
-mode SIW-fed
Patch Antenna Array with Differential Feeding
Network
Huayan Jin
#1
, Wenquan Che
#2
, Wanchen Yang
#3
, Kuo-Sheng Chin*
4
#
Department of Communication Engineering, Nanjing University of Science and Technology
Nanjing, China
1
huayan_jin@163.com
2
yeeren_che@163.com
3
yangwanchen@126.com
* Department of Electronic Engineering, Chang Gung University
Taoyuan 333, Taiwan, R.O.C
4
kschin@mail.cgu.edu.tw
Abstract—A millimeter-wave series-parallel differential-fed
patch antenna array is presented, where the intrinsic field
distribution of TE
20
mode in substrate integrated waveguide
(SIW) is used to conveniently implement dual-slot feeding. One
28 GHz patch antenna element fed by TE
20
-mode SIW is firstly
designed, achieving simulated 10-dB impedance bandwidth of
10.2% and peak gain of 6.48 dBi. A 4 × 4 array with a compact
series-parallel differential-fed network is further developed and
fabricated. Good agreement between the measured and simulated
results of the proposed antenna array is observed, indicating a
good and stable performance in terms of 8.5% matching
bandwidth, symmetry radiation patterns and low cross-
polarization levels (-30 dB in E-plane and -25 dB in H-plane,
respectively) from 26.9 GHz to 29 GHz.
Keywords—patch antenna; series-parallel differentially-fed
network; TE
20
mode; substrate integrated waveguide (SIW);
millimeter wave.
I. INTRODUCTION
In recent years, differential-fed patch antennas are
becoming more and more popular due to their good radiation
performances and compact integration with radio-frequency
integrated circuits (RFICs) and microwave monolithic
integrated circuits (MMICs). Therefore, differential-fed patch
antennas can be a good candidate for mmW applications.
Various designs of differential-fed antennas have been
reported in the last decade [1]-[5]. However, most of them
were fed by long probes or microstrips, causing undesirable
radiation leakage and additional loss in millimeter-wave bands.
Few differential-fed patch antenna arrays have been proposed
because of the bulky feeding network [6]. Alternatively,
substrate integrated waveguide (SIW), as an
electromagnetically closed planar guide-wave structure, has
been widely adopted for designs at mmW bands [7]-[8], which
features less radiation or transmission loss than the open
structures [9]. In [10] a differential-fed patch antenna array
with SIW series-parallel feeding network is proposed. But a
SIW - CPS - CMS transition is needed, which is complex and
difficult to design.
X
Z
Y
Substrate 1
GND 1
Substrate 2
GND 2
Input port
(TE
20
mode)
Patch
Coupling slots
SIW
h
h
(a)
Input port
Y-axis
X-axis
W
SIW
X
V
Lp
Wp
Ls
Ws
Xs
D
V
Ys
S
V
Matching
via1
Matching
via2
(b)
Fig. 1 The geometry of the proposed TE
20
-mode SIW-fed patch antenna
element: (a) 3D view and (b) top view.
In this work, a novel millimeter-wave patch antenna
element fed by TE
20
-mode SIW structure is proposed. A 4 × 4
differential-fed patch antenna array is further developed by
using a compact SIW series-parallel differential feeding
network. For demonstration, one prototype of the proposed 4 ×
4 antenna array is fabricated and measured, indicating low
cross-polarization level and symmetry radiation patterns.
Noting that, all the substrate materials used are Rogers 4003C
with dielectric constant of 3.55, loss tangent of 0.0029 and
thickness of 0.5 mm.
This work is supported by National Natural Science Foundation
Committee of China under project 61571231
, 61601224 and
the Natural
Science Foundation of Jiangsu Province BK20160844.
978-2-87487-047-7 © 2017 EuMA 10–12 Oct 2017, Nuremberg, Germany
Proceedings of the 47th European Microwave Conference
400