Two-Dimensional, Un-Equal, Series Power Dividers for Feeding Antenna Arrays

Two-dimensional, un-equal, series power dividers based on microstrip line sections and quadrature couplers are proposed. The dividers can easily be designed to feed two-dimensional antenna arrays with specified amplitudes excitations and equal phases for each element at the center frequency. The design method is presented, together with a simple example of a 4 × 4 microstrip antenna array fed by the proposed divider with binomial distribution. The performance of the couplers is first analyzed by the MATHEMATICA (Wolfram) software, and then checked by the Keysight Advanced Design System software (ADS). The simulation of the microstrip array antenna is performed by the CST Microwave Studio software. The bandwidth of the antenna is approximately 10% around the center frequency 1.9 GHz.