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MultiFunctional, Magnetically-Coupled, Electrically Small, Near-Field Resonant Parasitic Wire Antennas

MultiFunctional, Magnetically-Coupled, Electrically Small, Near-Field Resonant Parasitic Wire Antennas,10.1109/TAP.2010.2103008,IEEE Transactions on A

MultiFunctional, Magnetically-Coupled, Electrically Small, Near-Field Resonant Parasitic Wire Antennas   (Citations: 1)
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Several electrically small antenna systems that utilize the magnetic couplings between a coaxially-fed semi-loop antenna and capacitively-loaded loop (CLL)-based near-field resonant par- asitic (NFRP) elements are presented. Both one and two gap CLL elements are considered; their impact on the system performance, particularly their effects of the resonance frequencies and the cor- responding values, is evaluated. By integrating multiple NFRP CLL elements with the coaxially-fed semi-circular loop antenna, electrically small multi-band systems are achieved. They can be designed for a broad range of frequencies by tuning the NFRP ele- ments separately. Dual band designs are reported that achieve op- eration at the GPS L1 (1.5754 GHz) and L2 (1.2276 GHz) frequen- cies. Their operational modes and performance characteristics are studied.Theseleadtoadditionalelectricallysmallantennadesigns, which feature only one driven loop antenna and two NFRP CLL elements and which achieve circularly polarized (CP) operation. A CP antenna whose electrical size is at the GPS L1 frequency is presented in detail. Its simulated bandwidth and beamwidth, for which the axial ratio (AR) is less than 3 dB, are, respectively, 7.8 MHz and 76 .
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