Improvement of the Isolation Characteristics of a Two-Layer Self-Diplexing Array Antenna Using a Circularly Polarized Ring Patch Antenna

Wataru CHUJO
Masayuki FUJISE
Hiroyuki ARAI
Naohisa GOTO

IEICE TRANSACTIONS on Communications   Vol.E76-B    No.7    pp.755-758
Publication Date: 1993/07/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section of Letters Selected from the 1992 IEICE Fall Conference and the 1993 IEICE Spring Conference)
antennas and propagation,  self-diplexing antenna,  array antenna,  ring patch,  circular polarization,  

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In a two-layer self-diplexing antenna fed at two ports, theoretical analysis has already shown that the isolation characteristics can be improved by adjusting the angle between the feed locations of the transmitting and receiving antennas. In this letter, we experimentally investigate the isolation characteristics of the self-diplexing array antenna. First, calculated and experimental results for each feed location of the element antenna are compared and good agreement is found. Second, experimental results with a 19-element planar array indicate that a self-diplexing antenna with suitably chosen feed configuration is effective in improving the isolation in a phased array antenna.