Low Insertion and Large Dynamic Range Substrate Integrated Waveguide Equalizer on Ceramic for Feeding Network

In this paper, a novel design method of substrate integrated waveguide (SIW) equalizer fabricated on ceramic substrate with surface resistance, operating in millimeter wave band, is presented. Different from the previous SIW equalizers in [1], the surface resistance (TaN) is discretely introduced into SIW equalizer. The measurement results show that: over the entire Ka-band, the equalizing values are 3.12 dB, 6.25 dB, 9.05 dB, 13.01 dB and 16.84 dB, respectively, while the return losses are all better than −15.40 dB. Correspondingly, the insertion losses at the maximum frequency (40GHz) are only 0.94, 1.94, 2.59, 2.79 and 2.10, respectively.