A Novel Ultra-Wideband Design of Ridged Siw Magic-T

Abstract

In order to obtain a wideband sum-and-difference network, a novel ridged substrate integrated waveguide (RSIW) magic-T is designed. The proposed magic-T is composed of a five-layer RSIW structure. The signal input from the coaxial H-plane port is transmitted to RSIW through a stripline and split into two in-phase and equal signals at the output ports on the top and bottom layers because of the vertically symmetric structure. An E-plane SIW power divider is utilized to realize the E-plane input/output port of the magic-T. A remarkable bandwidth improvement is achieved due to the ridged structure and the wide bandwidth of a ladder-shape stripline optimized by genetic algorithm (GA). Measured results indicate that the magic-T has a fractional bandwidth (FBW) of 78.7% (6.4-14.7 GHz) with return loss better than 18.1 dB and great isolation characteristics.

A novel compact planar magic-T using CPS and microstrip-to-CPS transition

“…Therefore, many planar magic-T structures have been proposed to reduce the size. There are magic-Ts miniaturized using LTCC technology [17], substrate integrated waveguide [18,19] and NRD-guide [20]. Other planar magic-Ts usually use microstrip lines and slot lines [21,22,23,24,25,26,27,28,29,30].…”