In this paper, an improved broadband substrate integrated waveguide (SIW) phase shifter with embedded air strips is presented. Phase shifter can be generated based on the variable widths of SIW, variable lengths of microstrip line and a row of embedded air strips. The simulated and measured results both show that this kind of SIW phase shifter has excellent performance for a wider bandwidth. Measured results indicate that the proposed SIW phase shifters for the 45° and 90° versions have achieved the fractional bandwidths of 59.6% from 10.2 to 18.85 GHz with the accuracy of 2.5°, and of 62.3% from 9.5 to 18.1 GHz with the accuracy of 5°, respectively. The return losses are better than 15.8 dB and 14.5 dB for 45° and 90° modules, respectively. In addition, the insertion losses are both found to be better than 1.6 dB in the considered band.
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