A new HTS microwave filter using dual-mode multi-zigzag microstrip loop resonators

Jiang, Z.; Hejazi, Z.M.; Excell, Peter S.; Xu, Wei

doi:10.1109/apmc.1999.833717

1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)

DOI: 10.1109/apmc.1999.833717

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A new HTS microwave filter using dual-mode multi-zigzag microstrip loop resonators

Z. Jiang¹,

Z.M. Hejazi²,

Peter S. Excell³

et al.

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Cited by 1 publication

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Em Full-Wave Analysis and Testing of Novel Quasi-Elliptic Microstrip Filters for Ultra Narrowband Filter Design

Hejazi¹,

Scardelletti²,

Keuls³

et al. 2008

PIER

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Abstract-A new class of microstrip filter structures are designed, optimized, simulated and measured for ultra-narrowband performance essential to the wireless industry applications. More accurate model of the coupling coefficient is outlined and tested for narrowband filter design. Two sample filters are fabricated and measured to verify the simulations and prove the concept. The idea behind the new designs is based on minimizing the parasitic couplings within the resonators and the inter-resonator coupling of adjacent resonators. A reduction of the overall coupling coefficient is achieved even with less resonator separation which is a major issue for compactness of such filters. The best new designs showed a simulated fractional bandwidth (F BW ) of 0.05% and 0.02% with separations of S = 0.63 mm and S = 0.45 mm, respectively. The measured filters tend to have even narrower F BW than the simulated, though its insertion loss deteriorates, possibly due to mismatch at the interface with external circuitry and poor shielding effect of the test platform. The investigated 2-pole filters are accommodated on a compact area of a nearly 0.6 cm 2 . An improvement of tens of times of order in narrowband performance is achieved compared to reported similar configuration filters and materials. A sharp selectivity and quasi-elliptic response are also demonstrated with good agreement in both simulations and measurements. In all filters, however, the study shows that the narrower the F BW , the larger the insertion loss (IL) and the worse the return loss (RL). This is confirmed by measurements.

show abstract

Em Full-Wave Analysis and Testing of Novel Quasi-Elliptic Microstrip Filters for Ultra Narrowband Filter Design

Hejazi¹,

Scardelletti²,

Keuls³

et al. 2008

PIER

View full text Add to dashboard Cite

show abstract

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A new HTS microwave filter using dual-mode multi-zigzag microstrip loop resonators

Cited by 1 publication

References 9 publications

Em Full-Wave Analysis and Testing of Novel Quasi-Elliptic Microstrip Filters for Ultra Narrowband Filter Design

Em Full-Wave Analysis and Testing of Novel Quasi-Elliptic Microstrip Filters for Ultra Narrowband Filter Design

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