Miniaturized Wideband Branch-Line Hybrid Coupler With Four Pine Shape Capacitive Effect

In this letter a 3dB miniaturized broadband branch-line coupler is designed and experimentally verified. The new distributed capacitors which are placed within the empty space of the hybrid, minimize the size of the coupler. A prototype at 2.5GHz was designed and built. Measurement result confirmed that there is 2700 phase difference between output ports. The size of fabricated modified structure shows 55% reduction with respect to conventional 3dB branch line coupler and also the measured bandwidth is 0.5 GHz

Keywords:

Bandwidth , Branch-line hybrid coupler , miniaturized hybrid , size reduction