Study of the Combination Method and Its Application to Shrink a Patch Antenna Operating in the UHF Band

Abstract

This work is focused on how to efficiently shrink a patch antenna operating in the UHF band. Five typical independent methods are first introduced that were solely used to realize a small patch antenna. A potential combination method is further discussed utilizing two or more of these five methods. One miniature patch antenna is experimentally demonstrated operating at 735 MHz using the combination method, in which both of shorting wall and complementary split ring resonators are applied in a reconciling way. A two-step optimization procedure is given to show how the antenna sizes can be significantly reduced with this combination method. The antenna is fabricated on a simple dielectric with a low εεrr of 2.2. The patch size is only 0.127λλ ×× 0.123λλ. The antenna efficiency is considerably high as 77% in measurement.