Abstract
In this work, a wideband low sidelobe slot array antenna for wireless communication system at E-band is presented. The slots are excited by a parallel feeding network where the Taylor distribution is applied. Two types of wideband
unequal power divider with compact structures are designed for various output ratios to fit the limited feeding network space. One is integrated vertically inside a 2 by 1 elements subarray using a set of pins with asymmetrical offset. The other type is designed inside an E-plane T-junction with unbalance impedance at two output ports. To avoid main lobe tilt and asymmetrical radiation patterns, the feeding network is designed to be biaxially symmetrical, and the feed port is placed in the center of the back. A prototype is fabricated with brass and measured in an anechoic chamber. It achieves a peak gain of 25.8 dBi and a fractional impedance bandwidth of 19.2% with S11 below −10 dB. The measured radiation patterns agree with the simulated patterns very well, and the sidelobe level is lower than −21 dB.
unequal power divider with compact structures are designed for various output ratios to fit the limited feeding network space. One is integrated vertically inside a 2 by 1 elements subarray using a set of pins with asymmetrical offset. The other type is designed inside an E-plane T-junction with unbalance impedance at two output ports. To avoid main lobe tilt and asymmetrical radiation patterns, the feeding network is designed to be biaxially symmetrical, and the feed port is placed in the center of the back. A prototype is fabricated with brass and measured in an anechoic chamber. It achieves a peak gain of 25.8 dBi and a fractional impedance bandwidth of 19.2% with S11 below −10 dB. The measured radiation patterns agree with the simulated patterns very well, and the sidelobe level is lower than −21 dB.
Original language | English |
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Journal | I E E E Transactions on Antennas and Propagation |
Volume | 70 |
Issue number | 4 |
Pages (from-to) | 2676-2685 |
Number of pages | 10 |
ISSN | 0018-926X |
DOIs | |
Publication status | Published - 1 Apr 2022 |
Keywords
- Antenna arrays
- Antenna feeds
- Couplings
- E-band
- Pins
- Power dividers
- Slot antennas
- Slot array antenna
- Taylor distribution
- Wideband
- low sidelobe
- unequal power divider
- wideband