Reflectionless Bandstop Filter Based on Suspended Microstrip Line

Miao, Yi; Xiao, Jian‐Kang

doi:10.1109/apcap56600.2022.10069925

2022 IEEE 10th Asia-Pacific Conference on Antennas and Propagation (APCAP) 2022

DOI: 10.1109/apcap56600.2022.10069925

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Reflectionless Bandstop Filter Based on Suspended Microstrip Line

Yi Miao

Jian‐Kang Xiao

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2024

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Cited by 2 publications

References 7 publications

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A wide bandstop filter using negative permeability achieved by complementary electrical L-C resonators

Torabi,

Farahani,

Dadashzadeh

et al. 2024

AEU - International Journal of Electronics and Communications

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A wide bandstop filter using negative permeability achieved by complementary electrical L-C resonators

Torabi,

Farahani,

Dadashzadeh

et al. 2024

AEU - International Journal of Electronics and Communications

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Tunable Absorptive Dual Notch Filters Using A Stub-Loaded Coupled Line with An Inductor

Cho,

Park,

Yun

2024

J. Electromagn. Eng. Sci

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This paper presents tunable absorptive dual-notch filters using a stub-loaded coupled line with an inductor. The two-pole Butterworth filter function is modified to attain absorptive responses at a notch frequency. In addition, a stub-loaded coupled line with an inductor is employed to obtain dual-band bandstop responses, the required coupling coefficients, and quality factors based on the modified Butterworth function at two notch frequencies. In the proposed filter, tunable absorptive dual-notch responses are accomplished without using auxiliary circuits, such as an impedance matching network. The two resonant frequencies and the quality factors of the resonators are independently controlled by adjusting the three loading capacitances of the resonator. Three types of filters are designed and then built on a substrate with εr = 3.42 and h = 30 mils. The first filter (Filter A) attained a return loss of 11.2–17.1 dB/10.5–24.4 dB at 0.76–0.98 GHz/1.05–1.28 GHz. The measured return loss of the second filter (Filter B) was 12.5–14.8 dB/10.2–12.3 dB at 0.84–1.08 GHz/1.35–1.59 GHz. For Filter C, equipped with a 4-pole response achieved through the cascade connection of two 2-pole filters (Filter B), a return loss of 11.2–15.1 dB/14.2–27.3 dB was obtained at 0.9–1.1 GHz/1.38–1.63 GHz. The application areas of the proposed filters include cognitive radios and carrier aggregation systems requiring two transmit frequencies.

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Reflectionless Bandstop Filter Based on Suspended Microstrip Line

Cited by 2 publications

References 7 publications

A wide bandstop filter using negative permeability achieved by complementary electrical L-C resonators

A wide bandstop filter using negative permeability achieved by complementary electrical L-C resonators

Tunable Absorptive Dual Notch Filters Using A Stub-Loaded Coupled Line with An Inductor

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