New reconfigurable SIW phase shifter with transverse CPW-based stubs and PIN Diodes

In this work, a new electrically reconfigurable substrate integrated waveguide (SIW) phase shifter is proposed. The proposed structure uses a single PCB layer and does not require wire bounding for the bias circuit. Its principle consists in the integration, in the SIW, of several transverse CPW lines, each one is connecting a post, a PIN diode and a radial stub. Numerical results are presented to validate this concept. With the proposed design, for the two states of the PIN diodes (ON and OFF), broadband matching is obtained and a relatively constant phase difference is achieved in a broad frequency band.