NDLI: Enhanced broadband performance of thick CP patch antennas: A novel annular gap capacitor design

Content Provider	IEEE Xplore Digital Library
Author	Kovitz, J.M. Rahmat-Samii, Y.
Copyright Year	2014
Description	Author affiliation: Electr. Eng. Dept., Univ. of California, Los Angeles, Los Angeles, CA, USA (Kovitz, J.M.; Rahmat-Samii, Y.)
Abstract	Traditional probe-fed CP patch antennas are attractive design candidates due to their simplicity and intuitive design strategy, but unfortunately they suffer from narrow axial ratio (AR) and $S_{11}$ bandwidths (<;2%). In this paper, we enhance the $AR-S_{11}$ bandwidth through the utilization of thick substrates in combination with a novel annular gap capacitor to compensate for the feed reactance. Without the annular gap, thick substrates can increase the AR bandwidth, but the impedance matching within this band is severely degraded due to the inductive feed reactance. This paper demonstrates the annular gap design on the popular truncated corner patch antenna, although the annular gap concept can be easily applied to other traditional CP patch designs. A design prototype is demonstrated, with a measured $AR-S_{11}$ bandwidth of 5% for a substrate height of $0.08λ_{0}.$ To the authors' best knowledge, this is the first time that an annular gap in conjunction with thick substrates has been used to enhance the $AR-S_{11}$ bandwidth of CP patches.
Sponsorship	IEEE Antennas & Propag. Soc.
Starting Page	1881
Ending Page	1882
File Size	1472810
Page Count	2
File Format	PDF
ISBN	9781479935383
ISSN	15223965
e-ISBN	9781479935406
DOI	10.1109/APS.2014.6905267
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-07-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Substrates Bandwidth Patch antennas Feeds Probes Microstrip antennas Capacitors
Content Type	Text
Resource Type	Article

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