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[IEEE 2019 IEEE/MTT-S International Microwave Symposium - IMS 2019 - Boston, MA, USA (2019.6.2-2019.6.7)] 2019 IEEE MTT-S International Microwave Symposium (IMS) - Highly Configurable Cylindrical-Resonator-Based Bandpass Filter Built of Silica-Based Post-Wall Waveguide and Its Application to Compact E-Band Hybrid-Coupled Diplexer
摘要： This paper presents a compact and low-profile bandpass filter (BPF) built of silica-based post-wall waveguide. The BPF adopts direct-coupled resonator filters based on cylindrical resonators. The filter is highly configurable in shape and allows flexible and compact design. A compact E-band hybrid-coupled diplexer is presented as an application. The dimensions of the BPF and diplexer are 4.0×4.0 mm2 and 9.4×9.9 mm2, respectively. The insertion loss of the lower passband of the diplexer is 1.52 dB at 72.9 GHz and that of the higher passband is 2.0 dB at 82.8 GHz
关键词： millimeter wave devices,short-slot coupler,Substrate integrated waveguide (SIW),band-pass filters,diplexer
更新于2025-09-16 10:30:52
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[IEEE 2018 48th European Microwave Conference (EuMC) - Madrid (2018.9.23-2018.9.27)] 2018 48th European Microwave Conference (EuMC) - Temperature Dependence of Bandpass Filters Built of Silica-Based Post-Wall Waveguide for Millimeter-Wave Applications
摘要： Temperature dependence is shown of fifth-order Chebyshev bandpass filters (BPFs) built of silica-based post-wall waveguide for millimeter-wave applications. The measured frequency drift of the three BPFs with the center frequencies of 59 GHz, 73 GHz and 84 GHz were 10.12 ppm/?C, 9.56 ppm/?C and 11.91 ppm/?C over the temperature range of 30?C to 90?C, respectively. It is confirmed that the stability of the silica-based BPFs is superior to commercial-waveguide BPFs.
关键词： Resonator filters,Millimeter wave communication,Millimeter wave devices
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE/MTT-S International Microwave Symposium - IMS 2019 - Boston, MA, USA (2019.6.2-2019.6.7)] 2019 IEEE MTT-S International Microwave Symposium (IMS) - Liquid Crystal Phase Shifter Based on Nonradiative Dielectric Waveguide Topology at W-Band
摘要： This paper presents a continuously tunable nonradiative dielectric waveguide (NRD) phase shifter based on liquid crystal (LC) technology at W-band. LC is inserted in the NRD’s dielectric core to obtain tunability. Compared to other dielectric waveguides, which are prone to radiation losses, the NRD is radiation free even at bends and discontinuities. A maximum differential phase shift of 280? was achieved with an electric biasing voltage of ±150 V, accompanied with insertion losses between 2.9 dB to 4.9 dB, resulting in a maximum Figure-of-Merit of 85 ?/dB.
关键词： millimeter wave devices,tunable circuits and devices,phase shifter,Liquid crystal,nonradiative dielectric waveguide
更新于2025-09-12 10:27:22
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Liquid Crystal Based Dielectric Waveguide Phase Shifters for Phased Arrays at W-Band
摘要： In this work, the feasibility of microwave liquid crystal based dielectric waveguide phased shifters is investigated in a phased rod antenna array for the ?rst time. For this, a 1 × 4 rod antenna array is designed including the phase shifters as well as a cascaded E-plane power divider network. As core elements, the phase shifter are designed as continuously tunable subwavelength ?bers, partially ?lled with a newly speci?cally synthesized microwave liquid crystal, exhibiting a maximum FoM 145?/dB at 102.5 GHz. As proof-of-concept, a simpli?ed electric biasing network is developed, demonstrating its beam steering capability by changing the scanning angle between 0?, ?25? and +15? with three different voltage distributions. The antenna array is well matched throughout the complete W-band with a input re?ection below ?10 dB. The measured antenna gain is between 11.5 to 9.1 dBi at 85 GHz accompanied with a side lobe level between ?12 to ?7 dB, depending on the steering con?guration.
关键词： dielectric waveguide,millimeter wave devices,Phased array,microwave liquid crystal
更新于2025-09-11 14:15:04