Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 71, Issue 7, Pages 5616-5625Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2023.3267174
Keywords
Circular polarization; dual-band metaloop antenna; meta-atom; uncorrelated gain enhancement
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This article discusses the isolated gain enhancement (IsoGE) by inserting a parasitic ring or patch into the open space of a metaloop antenna. The analysis shows that both circular and square parasitic patches can effectively increase the small gain and meet the requirements of axial ratio and VSWR within certain frequency ranges.
When the circumference of a round metaloop antenna (RoMLA), made of C-type meta-atoms, is one guided wavelength (1 lambda(g)) of the current on the loop, the RoMLA radiates a left-hand circularly polarized (LHCP) wave at frequency f(N) and a right-hand circularly polarized (RHCP) wave at frequency f(H) in the direction normal to the antenna plane. These CP waves have different maximum gains. This article discusses enhancement in the small gain, not affecting the inherent large gain. Such uncorrelated enhancement in the gain, named isolated gain enhancement (IsoGE), differs from conventional correlated gain enhancement (non-IsoGE). For IsoGE, a parasitic ring is inserted into the open space of the RoMLA while maintaining the low-profile RoMLA structure on the order of lambda(0)/100 with lambda(0) being the free-space operating wavelength. It is found that the ring finally transformed into a round patch is effective for the IsoGE, where the induced current on the patch contributes to increasing the small gain. The analysis, for the first time, shows that the axial ratio (AR) and VSWR are, respectively, less than 3 dB and 2 across the 3-dB gain bandwidths around f(N) and f(H), as desired. Furthermore, the insertion of a square parasitic patch within the open space of a square metaloop antenna is also found to be effective for the IsoGE.
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