Design and Implementation of Multi-Band Hybrid Coupler with Arbitrary Power Division

Patch hybrid couplers are used to provide arbitrary power division ratio over two frequency bands. The coupler is designed using three main topologies. They are Branch-line, Coupled-line and Patch. Branch-line and Coupled-line provides equal power division ratio over two frequency bands. Patch structure provides arbitrary power division ratios. The patch hybrid coupler is the rapid development of communication topologies, it has become a trend to make a wireless component workable in multiple frequency bands. Complementary split ring resonators (CSRRs) are loaded onto each quadrant of a patch hybrid coupler to enable dual-band operation. The unique property of CSRR was found to give different power division ratios over the two frequency bands, which is difficult to implement using conventional approaches. The complementary split ring resonator is designed using microstrip components which operates in the frequencies of 1.2GHz and 2.4GHz. Keywords—Arbitrary power division ratios, complementary split ring resonator (CSRR), dual-band hybrid coupler, metamaterial, patch hybrid coupler.