Improved Joint Feeding Network for Mode Composite Coplanar Wave-Guide with Single Layer Structure

This paper, presents a single layer joint feeding network (JFN) for mode composite coplanar waveguide (MCCPW). The MCCPW is a composition of quasi-CPW and substrate integrated waveguide (SIW) supporting the quasi-TEM mode and TE10 mode as its fundamental mode respectively. The two modes can be independently excited by the two sub-transition. namely, the microstrip line to quasi-CPW transition and the coaxial line to SIW transition. the proposed JFN demonstrates a low loss, low fabrication complexity. A back-to-back JFN of MCCPW is de-signed as an example with two bands coverage from 3.6 GHz to 8.1 GHz and above 28 GHz. The proposed JFN can expand the application of the MCCPW in multi-band microwave to millimeter-wave circuits and antennas.