A New Microstrip Bandstop Filter for Fully Canonical Cul-de-Sac Coupling Configuration

Ohira, Masataka; Kanomata, Makoto; Ma, Zhewang; Wang, Xiaolong

doi:10.1109/mwsym.2018.8439316

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“…Although not essential for this application, this filter layout is compatible with and could be modified by other filter design techniques such as Defected Ground Structure (DGS) [18] and cul-de-sac coupling configuration [19] to tailor its performance to other requirements.…”

Section: Introductionmentioning

confidence: 99%

Superconducting Notch Filter for RFI Mitigation in Ground-Based Radio Telescope

Turner

Stevenson

Cantor

et al. 2023

IEEE Trans. Appl. Supercond.

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This paper presents a high-rejection, thin-film HTS, microstrip bandstop filter to prevent a local and high-power RFI source from interfering with NASA GGAO's VGOS cryogenic receiver. This filter has an excellent 2.7%, 50-dB-fractionalbandwidth and a center stop-band frequency of 9.41 GHz. It does not contain any narrow or interdigital features as found in some designs, which reduces the fringing electric fields and improves its power handling capability. The YBCO films were grown on 435-µm-thick R-plane sapphire substrate and the anisotropic behavior was modeled and simulated with a high degree of accuracy. The device was tested while cooled to 77 K and the measurements agree well with simulation.

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Section: Introductionmentioning

confidence: 99%