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2 GHz electromagnetic crystal reflector antenna

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4 Author(s)
Kim, D. ; Sch. of Electr. Eng., Korea Univ., Seoul, South Korea ; Kim, M. ; Xin, H. ; Hacker, J.

The radiation pattern of a monopole antenna with a small electromagnetic crystal (EMXT) reflector was investigated. High frequency structure simulations predict a considerable amount of near-field shielding with undisturbed antenna impedance matching when a perfect magnetic conductor reflector is positioned near the monopole. The pattern distortion created by the reflector gradually decreases, reaching a minimum in the far field. Experimental results show the monopole with an EMXT reflector, λ0/4×λ0/2 in size, produces a radiation pattern with a front-to-back ratio of 10.8 and 5.7 dB in the near and far fields, respectively.

Published in:

Electronics Letters  (Volume:39 ,  Issue: 15 )