Analytical closed-form solutions for different configurations of parallel-coupled microstrip lines

A multilayer inphase power divider with an ultra wideband behaviour is presented. The proposed divider exploits broadside coupling via a multilayer microstrip/slot configuration. The design method utilised for the device is based on the conformal mapping techniques. The developed device has a compact size with an overall dimension of 20 mm×30 mm. The simulated and measured results show that the proposed device has equal power division between the two output ports wit