Low-Loss Reconfigurable Phase Shifter in Gap-Waveguide Technology for mm-Wave Applications
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AuthorPalomares Caballero, Ángel; Alex Amor, Antonio; Escobedo Araque, Pablo; Valenzuela Valdes, Juan Francisco; Padilla De La Torre, Pablo
Phase shifterGap-waveguide technologyLowlossReconfigurable waveguidemm-waves
Publisher version: Á. Palomares-Caballero, A. Alex-Amor, P. Escobedo, J. Valenzuela-Valdés and P. Padilla, "Low-Loss Reconfigurable Phase Shifter in Gap-Waveguide Technology for mm-Wave Applications," in IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 67, no. 12, pp. 3058-3062, Dec. 2020, [doi: 10.1109/TCSII.2020.3000058]
SponsorshipSpanish Research and Development National Program TIN2016-75097P RTI2018-102002-A-I00; Junta de Andalucia B-TIC-402-UGR18 P18.RT.4830; FPU18/01965
In this brief, we present a low-loss mechanically reconfigurable phase shifter implemented in gap-waveguide technology for mm-wave frequencies. The proposed design gives a practical implementation of tuning elements inside the waveguide providing alternatives to the use of the E-plane split waveguide at high frequencies in order to avoid leakage losses. The depicted phase shifter design is based on a H-plane split waveguide. The phase shift is controlled by means of a tuning screw, which exerts pressure on a flexible metallic strip inserted inside the waveguide. The flexible strip bends with different curvature radii and determines the phase shift at the output port. Cost-effective manufacturing and simple implementation of the flexible metallic strip are achieved by means of the gap-waveguide design. A prototype has been manufactured for validation purposes. Good impedance matching is achieved from 64 GHz to 75 GHz providing a 15.8% impedance bandwidth. The results show a maximum phase shift of 250° with a maximum and mean insertion loss (IL) of 3 dB and 1.7 dB, respectively.