Parallel coupled-line bandpass filter with branch-line shape for G-band frequency

Parallel coupled-line bandpass filter with branch-line shape for G-band frequency

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A parallel coupled-line planar bandpass filter (BPF) with branch-line shape using coplanar waveguide technology on GaAs substrate is presented. The unit parallel coupled-line BPF utilises a parallel coupled-line resonator with an open-ended stub which has suppression response of spurious band. Four unit parallel coupled-line BPFs are integrated with branch-line shape and open-circuit stubs on input and output ports are also integrated for improvement of rejection performance. The proposed fourth-order filter was fabricated on GaAs substrate with dielectric thickness of 50 µm and gold thickness of 1.2 µm. The fabricated fourth-order BPF shows a 3 dB bandwidth from 177 to 209 GHz frequency range with insertion loss of 6.5 dB, rejection of 38 dB and return loss better than 12 dB. It has a high resolution fractional bandwidth of 17%


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      • Prigent, G., Rius, E., Blary, K., Happy, H., Lepilliet, S., Dambrine, G., Cappy, A.: `Design of narrow band-pass planar filters for millimeter-wave applications up to 220 GHz', IEEE Int. Microwave Symp., 2005, California, USA, p. 1491–1494.
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      • Prigent, G., Gianesello, F., Gloria, D., Raynaud, C.: `Bandpass filter for millimeter-wave applications up to 220 GHz integrated in advanced thin SOI CMOS technology on high resistivity substrate', 37thEur. Microwave Conf. Dig., 2007, Munich, Germany, p. 676–679.
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