Investigation of SIW Cavity-Backed Slot and Patch Antennas With Conical Radiation Patterns

Substrate integrated waveguide (SIW) cavity-backed slot and patch antennas with conical radiation patterns are investigated. In a center-fed SIW circular cavity with the top wall removed, a series of cavity modes with conical radiation patterns can be excited, wherein the lowest two modes are the TM...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2020-08, Vol.68 (8), p.5978-5988
Main Authors: Cai, Shuangqi, Liu, Juhua, Long, Yunliang
Format: Article
Language:English
Subjects:
Antenna radiation patterns
Antennas
Bandwidth
Bandwidths
Cavity-backed
conical radiation pattern
gap-coupled patch antenna
Investigations
Patch antennas
Reflectance
Reflector antennas
Resonant frequency
slot antenna
Slot antennas
substrate integrated waveguide (SIW)
Substrate integrated waveguides
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Summary:Substrate integrated waveguide (SIW) cavity-backed slot and patch antennas with conical radiation patterns are investigated. In a center-fed SIW circular cavity with the top wall removed, a series of cavity modes with conical radiation patterns can be excited, wherein the lowest two modes are the TM 01 and TM 02 modes. The cavity-backed slot antenna with either of the two modes can work independently, but the bandwidth is narrow. In order to improve the bandwidth, an SIW cavity-backed gap-coupled patch antenna is proposed. The antenna has a wide triple-resonance bandwidth, which includes the patch TM 02 mode, and the cavity TM 01 and TM 02 modes. The working principle and the mode characteristics are investigated. The antenna is designed, fabricated, and measured. Measurement results show that the antenna has a wide bandwidth of 64.6%. In the operation band, the antenna has a low reflection coefficient below −10 dB and provides a conical radiation pattern.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2020.2990312