Simulations of N-Way, Series Power Dividers

CST Microwave Studio simulations of N-way, un-equal, symmetric, microstrip series power dividers are proposed. The dividers are constructed from quarter wavelength transmission line sections and 90 degrees quadrature hybrids. For simplicity we have simulate microstrip dividers on air substrate, where the distances between output ports are one wavelength. 1:2, 1:3, 1:4 and 1:5 dividers are presented, where the output amplitudes were optimized to approach binomial distribution at the center frequency of 2 GHz. Moreover, 1:3 divider on FR4 substrate is presented, and an array antenna of 3 microstrip elements fed by this divider was simulated, showing sidelobes reduction as expected. The typical amplitude deviation from the binomial distribution at 2 GHz is less than 0.1 dB, and the phase error between adjacent output ports is 10 degrees approximately.