Switchable & Configurable Feed Network for Array Antenna at C-Band Application

A 2 × 2 circularly polarized array is presented whose polarization diversity can be electronically controlled. The antenna array utilizes 180° rat-race and two pair of hybrid couplers. The antenna’s CPW feed-line comprises of a reconfigurable sequentially rotated network. Reconfigurable property is achieved by employing two pairs of PIN diodes that determine the right-handed and left-handed circular polarization, known as state1 and state2 respectively. Moreover, vias are used to provide a good transition among CPW feed-line to microstrip-line. Measurements confirm presented array exhibits broadband operation which makes the antenna applicable for C band and IEEE 802.16.a systems. The measured improved and optimized impedance bandwidth of the proposed arrays structure is 3.2–8.0 GHz in state#1 and 3.1–7.7 GHz in state#2 for S11 ≤ − 10 dB and its 3 dB axial ratio is 4.8–7.31 GHz in state#1 and 4.9–7.2 GHz in state#2. The approximately maximum gain of antenna is about 7dBi. The Proposed antenna array with its optimized and modified feed-network is outstanding candidate for wireless communication systems.