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Wide-bandwidth thru-reflect-line calibration for empty substrate-integrated coaxial line with grounded coplanar transitions
摘要： Empty coaxial structures built with printed circuit boards have low radiation, low losses, high quality factor and non-dispersive features. The full integration of empty substrate-integrated coaxial line (ESICL) in a planar substrate is nowadays a fact thanks to a grounded coplanar transition. To properly characterize and measure this new ESICL family of devices, a low cost and easy to manufacture thru-reflect-line calibration kit is proposed to de-embed not only the connectors and feeding lines, but also the ESICL transitions.
关键词： calibration,grounded coplanar,thru-reflect-line,empty substrate-integrated coaxial line
更新于2025-09-23 15:23:52
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Design and analysis of a quad-band substrate-integrated-waveguide cavity backed slot antenna for 5G applications
摘要： A planar and compact substrate integrated waveguide (SIW) cavity backed antenna and a 2 × 2 multi-input multi-output (MIMO) antenna are presented in this study. The proposed antenna is fed by a grounded coplanar waveguide (GCPW) to SIW type transition and planned to be used for millimeter-wave (mm-wave) fifth generation (5G) wireless communications that operates at 28, 38, 45, and 60 GHz frequency bands. Moreover, the measured impedance bandwidth (|S11| ≤ ? 10 dB) of the antenna covers 27.55 to 29.36, 37.41 to 38.5, 44.14 to 46.19, and 57.57 to 62.32 GHz bands and confirms the quad-band characteristic. Omni-directional radiation characteristics are observed in the far-field radiation pattern measurements of the antenna over the entire operating frequency. The reported antenna is compact in size (9.7 × 13.3 × 0.6 mm3) and the gain values at each resonance frequency are measured as 3.26, 3.28, 3.34, and 4.51 dBi, respectively. Furthermore, the MIMO antenna performance is evaluated in terms of isolation, envelope correlation coefficient and diversity gain.
关键词： fifth generation,grounded coplanar waveguide,quad-band,substrate integrated waveguide,cavity backed antenna
更新于2025-09-23 15:21:01
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[IEEE 2018 48th European Microwave Conference (EuMC) - Madrid, Spain (2018.9.23-2018.9.27)] 2018 48th European Microwave Conference (EuMC) - Spurious Mode Suppression in the Design of GCPW Submillimeter-wave Power Amplifiers
摘要： This work investigates the problem of spurious mode propagation in a grounded coplanar waveguide (GCPW) frequencies between 200 GHz and 335 GHz. environment at Design strategies focused on minimizing undesired effects are explored through full-wave electromagnetic (EM) analysis and experimental results from different test structures. It is shown that a λ/13 distance between via-holes should be chosen to avoid unwanted resonances at these high frequencies. The critical role of via-holes is also demonstrated through the experimental comparison of two power splitters. Finally, the need of closed RF pads to avoid any propagation of parasitic modes is experimentally shown in an application example of a power ampli?er (PA) cell based on a 35 nm GaAs metamorphic high electron mobility transistor (mHEMT) technology. The PA cell with closed pads achieves a 0.5 dB bandwidth of 28 % with small-signal gain levels larger than 5.2 dB.
关键词： parallel-plate mode (PPM),via-holes,grounded coplanar waveguide (GCPW),Dolph-Chebyshev divider,metamorphic high electron mobility transistor (mHEMT)
更新于2025-09-04 15:30:14