Gain enhancement of a circularly polarized patch antenna using a suspended patch

A circularly polarized (CP) patch antenna with gain enhancement is presented. This paper provides a technique to increase the CP gain of an antenna without changing its original configuration. A gain enhancement of 1.7 dBic is achieved by an additional suspended patch. First, we design a CP patch antenna, which works in the band of Wireless Local Area Network (WLAN) with an antenna gain of 10 dBic. Second, adding a suspended patch along the z-axis to the original antenna which the gain enhancement of the modified structure can be improved. The measured and simulated results are equivalent agreement, and they both show that the antenna gain is indeed improved about 1.7 dBic by adding a suspended patch.