WSEAS Transactions on Communications
Print ISSN: 1109-2742, E-ISSN: 2224-2864
Volume 16, 2017
Novel Structure and the Characteristics of a Microwave Circular Polarization Antenna
Authors: ,
Abstract: This paper gives a novel structure of circular polarization antenna at the X-band. This antenna is made as plane antenna composed of a feed- and a reactance-elements on a wide ground plate. The feed element is made by a circular disc cut linearly at the both sides along x-axis. The resonant frequencies are fH and fL along x- and y- axes respectively. Degeneration is achieved by shifting the resonant frequencies to be fH > fL which correspond to resonant lengths along x- and y- axes. By defining the position of the feeding point, π/2 phase difference is provided for circular polarization with the current iL and iH. The reactance element is made of a circular disk smaller than the feed element. This element expands the bandwidth fH - fL of resonances, which brings expansion of effective band width of circular polarization. A circular polarization plane antenna with 0.7 GHz bandwidth was realized at 10GHz without spurious radiation between 5 ~ 15GHz.
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Keywords: Circular polarization, Plane antenna, Degeneration of resonances, spurious frequencies, Axial ratio, X-band antenna
Pages: 184-191
WSEAS Transactions on Communications, ISSN / E-ISSN: 1109-2742 / 2224-2864, Volume 16, 2017, Art. #22