Design of a WLAN antenna with high isolation characteristic.

In this letter, a design procedure of a wideband WiFi antenna is presented. The proposed antenna consists of a 4-port patch antenna, LTCC hybrid quadrature coupler, and front-end structure. By taking advantage of LTCC components, the bandwidth property is improved and the front-end structure size is minimized. Also, using the proposed antenna and front-end structure, a low cost repeater system is implemented successfully. For verification, the proposed antenna is fabricated on FR4 substrate. From the measured results at the operating frequency 2.45 GHz, isolation between transmitter and receiver is achieved below −40 dB over a 100MHz bandwidth. [ABSTRACT FROM PUBLISHER]