Design of a 324 MHz 200 kW CW Waveguide-to-Coaxial Adaptor for Radio Frequency Quadrupole Microwave System by Xinsheng Yan, Lianmin Zhao, Bojiang Ding, Weiye Xu, Hua Jia, Zege Wu, Fukun Liu

“…A 324 MHz 200 kW waveguide-to-coaxial adaptor has been designed and fabricated for a microwave coupler in a radio frequency quadrupole system. …”
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Excitation of ULF, ELF, and VLF Resonator and Waveguide Oscillations in the Earth–Atmosphere–Ionosphere System by Lightning Current Sources Connected with Hunga Tonga Volcano Erupt... by Yuriy G. Rapoport, Volodymyr V. Grimalsky, Andrzej Krankowski, Asen Grytsai, Sergei S. Petrishchevskii, Leszek Błaszkiewicz, Chieh-Hung Chen

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K-Band Waveguide Resonator Bandpass Filter Structure With Adjustable Transmission Zeros for Producing Various Symmetric and Asymmetric Responses by Sanggu Lee, Jongheun Lee, Boyoung Lee, Jaehwan Lim, Jaesub Han, Juseop Lee

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Detection of VLF Attenuation in the Earth‐Ionosphere Waveguide Caused by X‐Class Solar Flares Using aGlobal Lightning Location Network by T. S. Anderson, M. P. McCarthy, R. H. Holzworth

“…Abstract Solar flares, energetic particles, and Earth‐impacting coronal mass ejections enhance ionization in the lower ionosphere, inhibiting radio wave propagation in the Earth‐ionosphere waveguide (EIWG). …”
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Electrical Property of 3D Printed Continuous Fiber Reinforced Thermoplastic Composite Mesh Reflecting Surfaces by Kunyang Lin, Xiaofei Ma, Zhen Cui, Youwei Kang, Pengfei Huang, Huanxiao Li, Di Wu, Guanlong Su, Xiaoyong Tian

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Balancing the Potential Gauging Process Applied to Wave Propagation for Arbitrary Space-Times by Thomas Reum

“…This article addresses possibilities to compensate an unwanted side effect arising in the widely used gauging process of electrodynamic potentials due to mathematical conditions applied to describe propagating electromagnetic (EM) waves with a focus on radio frequency (RF). Previous studies have shown by means of guided propagation that phase velocities which differ from intuitive understanding occur for several components of potentials when deviating from a specific gauge determined by physical relationships. …”
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High-Power MHz to 100s of GHz Circuits and Systems for Nuclear Fusion Reactors With Examples From SST-1 and ITER by Kamal K. Samanta

“…This paper discusses the essential requirements and importance of various radio frequencies in fusion reactors, such as ion cyclotron, electron cyclotron, and hybrid resonances. …”
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Propagation Mechanism Modeling in the Near-Region of Arbitrary Cross-Sectional Tunnels by Ke Guan, Zhangdui Zhong, Bo Ai, Ruisi He, Yuanxuan Li, César Briso Rodríguez

“…Along with the increase of the use of working frequencies in advanced radio communication systems, the near-region inside tunnels lengthens considerably and even occupies the whole propagation cell or the entire length of some short tunnels. …”
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Evaluating the Relationship Between Relative Permittivity and Infill Density in 3D Printed Dielectric Slabs by Bibek Kattel, Winn Elliott Hutchcraft, Richard K. Gordon

“…As the infill density of a 3D printed substrate is varied, its relative permittivity also varies which affects the performance of radio frequency devices. Hence, it is essential to characterize the relationship between relative permittivity and infill density in 3D printed substrates. …”
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Comprehensive FR1(C) and FR3 Lower and Upper Mid-Band Propagation and Material Penetration Loss Measurements and Channel Models in Indoor Environment for 5G and 6G by Dipankar Shakya, Mingjun Ying, Theodore S. Rappaport, Hitesh Poddar, Peijie Ma, Yanbo Wang, Idris Al-Wazani

“…Allocations in the lower and upper mid-band aim to balance coverage and capacity, but there is limited knowledge about the radio propagation characteristics in the 4–24 GHz frequency bands. …”
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