Rectangular Waveguide Cross-Guide Couplers: Accurate Model for Full-Band Operation

In this letter, a precise model for accommodating the cross-guide couplers is proposed and validated. This includes accurate formulas for the polarizabilities of cross slots as well as the effect of finite wall thickness on the coupling level. The proposed model shows a leading performance compared with previously published models in the literature showing a maximum error of 2.5%. The experimental validation shows an excellent agreement with the simulated results.