Design of X-Polarized GSM 900 Base Station Antenna with Field Test Measurement

This paper present the design and development of base station antenna operating at 900 MHz GSM network. The base station antenna has a voltage standing wave ratio (VSWR) below 1.4, dual polarized, 16dB gain and horizontal beamwidth of 105 degree. Dipole antenna has been chosen due to its simplicity in antenna design and has been fabricated using brass. The dipole antennas are slanted to either +45 degree or -45 degree to increase the base station antenna sensitivity and the user capacity of a base station. This slanted feature is called X-Polarized or cross polarized. Feed network channel the radio frequency (RF) power equally to the antenna elements in the array. The VSWR of the base station antenna was measured by using Agilent 8722ES Network Analyzer and the radiation pattern was done in Anechoic Chamber in Multimedia University, in Cyberjaya, Malaysia. The field test measurement was done in a GSM900 base station site in Selangor, Malaysia.