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This paper presents a spiral antenna backed by a mushroom-shaped EBG reflector. The antenna characteristics are investigated on the basis of the electric and magnetic fields obtained by using the finite-difference time-domain method. The investigation reveals that removing some patches from the EBG reflector improves the axial ratio.
Using the moment method, an asymmetrical two-wire spiral antenna has been analyzed in the presence of a conducting plane reflector. The spiral outer circumference is appropriately chosen for dual CP radiation. It is found that dual operation for a 3-dB axial-ratio criterion is obtained in a frequency bandwidth of 3%. Dual operation is also attained for a reflector-backed loop antenna with perturbation...
An equiangular spiral antenna backed by a cavity is investigated using the electric and magnetic fields obtained using Yeepsilas FDTD method. Strip absorbers are placed inside the cavity. Antenna configuration parameters other than the cavity height Hcav are fixed throughout this paper, where the cavity diameter Dcav is chosen to be 120 mm (slightly larger than the antenna diameter of 113 mm). The...
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