Polarization-Diversity Ring Slot Antenna With Frequency Agility

A design for polarization-diversity slot antennas with switchable frequency is described. The antenna structure is mainly composed of a radiating annular slot backed with a reflector and a quasi-lumped coupler with two different operating modes, quadrature hybrid mode and T-junction power divider mo...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2012-08, Vol.60 (8), p.3953-3957
Main Authors: ROW, Jeen-Sheen, SHIH, Chuang-Jiashih
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Capacitance
Couplers
Exact sciences and technology
Frequency reconfigurable antenna
Joining
Linear polarization
Networks
Polarization
polarization diversity
Prototypes
Radiocommunications
Resonant frequencies
Resonant frequency
slot antenna
Slot antennas
Studies
Switches
Telecommunications
Telecommunications and information theory
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Description
Summary:A design for polarization-diversity slot antennas with switchable frequency is described. The antenna structure is mainly composed of a radiating annular slot backed with a reflector and a quasi-lumped coupler with two different operating modes, quadrature hybrid mode and T-junction power divider mode. The resonant frequency of the slot antenna and the operating frequencies of the two modes of the coupler can be tuned with variable capacitors. First, the effects of changing capacitance values on the performances of the antenna and coupler are respectively analyzed. Then, according to the simulation results, validated with experiments, a reconfigurable antenna prototype integrating with several diodes and their related dc-bias networks is constructed. The prototype is designed to be with three working frequencies, and moreover it can provide one linear polarization and two circular polarizations at each working frequency. Details of measured antenna performances are shown.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2012.2201114