Single- and Dual-Polarized Tunable Slot-Ring Antennas

Single-and dual-polarized slot-ring antennas with wideband tuning using varactor diodes have been demonstrated. The single-polarized antenna tunes from 0.95 to 1.8 GHz with better than -13 dB return loss. Both polarizations of the dual-polarized antenna tune from 0.93 to 1.6 GHz independently with b...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2009-01, Vol.57 (1), p.19-26
Main Authors: White, C.R., Rebeiz, G.M.
Format: Article
Language:English
Subjects:
Annular slot antennas
Antennas
Applied sciences
Broadband antennas
Capacitance
Diodes
dual-polarized antennas
Exact sciences and technology
Frequency
Frequency ranges
Loaded antennas
Noise levels
Polarization
Radiocommunications
reconfigurable antennas
Resonance
Slot antennas
slot-ring antennas
Switches
Telecommunications
Telecommunications and information theory
tunable antennas
Tuning
Varactor diodes
Varactors
Wideband
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Description
Summary:Single-and dual-polarized slot-ring antennas with wideband tuning using varactor diodes have been demonstrated. The single-polarized antenna tunes from 0.95 to 1.8 GHz with better than -13 dB return loss. Both polarizations of the dual-polarized antenna tune from 0.93 to 1.6 GHz independently with better than -10 dB return loss and > 20 dB port-to-port isolation over most of the tuning range. The capacitance of the varactor diodes varies from 0.45 to 2.5 pF, and the antennas are printed on 70times70 times0.787 mm 3 substrates with epsiv r = 2.2. The dual-polarized slot-ring antenna can either be made both frequency- and polarization-agile simultaneously, or can operate at two independent frequencies on two orthogonal polarizations. To our knowledge, this is the first dual-polarized tunable antenna with independent control of both polarizations over a 1.7:1 frequency range.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2008.2009664