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Development of a Low-Profile Circularly Polarized Cavity-Backed Antenna Using HMSIW Technique

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2 Author(s)
Razavi, S.A. ; Electr. Eng. Dept., Ferdowsi Univ. of Mashhad, Mashhad, Iran ; Neshati, M.H.

In this paper, two single fed low-profile cavity-backed planar slot antennas for circular polarization (CP) applications are first introduced by half mode substrate integrated waveguide (HMSIW) technique. One of the structures presents right handed CP (RHCP), while the other one offers left handed CP (LHCP). A single layer of low cost printed circuit board (PCB) is employed for both antennas providing low-cost, lightweight, and also easy integration with planar circuits. An inset microstrip line is used to excite two orthogonal quarter-wave length patch modes with required phase difference for generating CP wave. The new proposed antennas are successfully designed and fabricated. Measured results are in good agreement with those obtained by numerical investigation using HFSS. Results exhibit that both antennas present the advantages of conventional cavity backed antennas including high gain and high front to back ratio (FTBR).

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Antennas and Propagation, IEEE Transactions on  (Volume:61 ,  Issue: 3 )