Venter, J.J.P. (Johannes)Stander, TinusFerrari, Philippe2018-10-102018-10-102018-09Venter, J.J.P., Stander, T. & Ferrari, P. 2018, 'X-band reflection-type phase shifters using coupled-line couplers on single-layer RF PCB', IEEE Microwave and Wireless Components Letters, vol. 28, no. 9, pp. 807-809.1531-130910.1109/LMWC.2018.2853562http://hdl.handle.net/2263/66833In this letter, an X-band reflection-type phase shifter is presented. It is based on a single-layer stub-loaded coupled-line coupler loaded by two-varactor tuning circuits. This choice of coupler significantly improves on the phase shifter bandwidth achievable with a branch-line coupler, as it features a lower phase imbalance across the band of interest. The proof-of-concept prototype achieves better than 10-dB return loss across a 20% fractional bandwidth. The phase shifter further exhibits insertion loss of 2.1 ± 1.3 dB and maximum phase shift of 392° at 10 GHz, leading to a state-of-the-art figure of merit at X-band of 115°/dB. The occupied area is 0.25λ g 2 .en© 2018 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.BandwidthReflection-type phase shifter (RTPS)VaractorsX-bandCouplersPhase shiftersRadio frequencyInsertion lossCouplingsWaveguide couplersMicrowave phase shiftersMicrostrip linesCircuit tuningBand-pass filtersPostprint Article