Two-Element Retrodirective/Beam-Switching Array Using Dual-Mode Coupler

A simple two-element integrated array, capable of dual-mode operations, is investigated. With the feeding network unchanged, the integrated array is identical to a reflection-type retrodirective array in one band, but automatically reconfigures as a beam-switching array with mutually orthogonal sum...

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Bibliographic Details
Published inIEEE antennas and wireless propagation letters Vol. 16; pp. 2240 - 2243
Main Authors Chang, Li, Yang, Hong-Yi, Nam Chu, Huy, Ma, Tzyh-Ghuang
Format Journal Article
LanguageEnglish
Published New York IEEE 2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Antenna measurements
Antenna radiation patterns
Antennas
Beam steering
Circuits
Couplers
Diplexers
Employee assistance programs
Feeding
Loads (forces)
lumped element microwave circuits
Phased arrays
Ports (Computers)
Reflection
retrodirective antennas
Scattering parameters
Switching
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Summary:A simple two-element integrated array, capable of dual-mode operations, is investigated. With the feeding network unchanged, the integrated array is identical to a reflection-type retrodirective array in one band, but automatically reconfigures as a beam-switching array with mutually orthogonal sum and difference patterns in the other band. The core building block is a dual-mode coupler, which functions identically to a 90° hybrid coupler and a 180° hybrid coupler, respectively, in the two bands. By integrating this unusual dual-mode coupler with reflection loads, diplexers, gain stages, and antennas, a planar integrated array is demonstrated on a printed circuit board. The idea is supported by experimental results including S-parameters and radiation patterns.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2017.2710086