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In the design of circular patch antenna, the feed point locations SF=5, SF=6, SF=7 and SF=8 were selected and the simulated results compared and the optimum location adopted and implemented. The best feed point was located at SF=5mm where return loss RL is -37.81dB, followed by SF=6mm with return loss RL of -17.14dB and SF=7mm with return loss RL is -11.38dB. The feed point location at SF=8mm was rejected since it falls outside the acceptable figure of VSWR=2. The material used for the proposed antenna is FR-4 with the dielectric constant of 4.35 and dielectric loss tangent of 14e-3. The proposed antenna can find application in Wireless Local Area Network (WLAN) and cellular phone. General Terms Feed offset, feed pin radius, Feed variation, Antenna Magus, Circular patch microstrip antenna.

Investigation of the Effect of Feed Variation on the Performance of a Circular Patch Microstrip Antenna