General Four-Resonator Filters at Microwave Frequencies (Correspondence)

Kurzrok, R.M.

doi:10.1109/tmtt.1966.1126254

Cited by 76 publications

(31 citation statements)

References 3 publications

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“…It is well-known that the conventional 2 × 2 configuration, i.e., a quadruplet [1][2][3], possesses a pair of transmission zeros on both sides of the passband due to the cross coupling between the first and the last resonator. Many microstrip filters with a quasi-elliptic function passband have been realized.…”

Section: Introductionmentioning

confidence: 99%

Microstrip Realization of Trisection Synthesis With Frequency-Dependent Admittance Inverter

Hsu¹,

Kuo²

2011

PIER

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Abstract-Frequency-dependent admittance (J-) inverter is incorporated in synthesis of microstrip trisection filters to achieve a quasielliptic function response. In the admittance matrix of the lowpass prototype, certain coupling is modeled by a constant J-inverter multiplied by the complex frequency variable s. Direct synthesis of three lowpass prototypes is presented. Based on the standard lowpass to bandpass transformation, coupled microstrip resonators with both electric and magnetic coupling are devised to implement the J-inverter with desired frequency-dependent characteristics. Tapped-line input/output is used and several transmission zeros can be created in the upper and lower rejection bands. In experiments, a third-order filter with four zeros, a fourth-order circuit with three zeros, and a fourth-order filter with five zeros are designed and fabricated. Measured results are compared with the simulation responses to validate the theory.

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Section: Introductionmentioning

confidence: 99%

Microstrip Realization of Trisection Synthesis With Frequency-Dependent Admittance Inverter

Hsu¹,

Kuo²

2011

PIER

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“…The insertion of transmission zeros at finite frequencies provides the necessary sharp cutoff slopes and reconfigurability responses, depending on the requirements of the application. In particular, synthesis techniques available for the design of filtering structures, implementing transmission zeros, could be based in a main structure with an in-line coupling topology, to which additional bypass or cross coupling between nonadjacent resonators are introduced [5,6].…”

Section: Introductionmentioning

confidence: 99%

Novel Implementation of Transversal Filters in Multilayered Microstrip Technology

Rebenaque

García

Gómez‐Tornero

et al. 2010

Journal of Electromagnetic Waves and Applications

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Abstract-This paper presents novel and compact implementations of bandpass filters using transversal topologies. The structures presented implement different transfer functions of order three in multilayered microstrip technology. In order to allow for easy implementation of the required coupling, multilayered broadside configurations are proposed. We demonstrate that with the proposed configurations, both dualband and quasi-elliptic responses can be easily synthesized, by only changing the sign of certain entries in the coupling matrix. To easily adjust the sign of the coupling, novel resonators are proposed, including simple half-wavelength transmission line resonators, meander line resonators and shortcircuited resonators. Experimental validations for both prototypes are presented, demonstrating the validity and usefulness of the proposed configurations.

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“…The interdigital (IDT) coupled lines or coupled lines at the ends of this structure are used as a capacitor in order to reduce the resonator size. In addition, crosscoupled filter with these attractive characteristics is that of quasielliptic function response filters with a pair of attenuation poles at finite frequencies [12,13]. The capability of placing attenuation poles near the cutoff frequencies of the pass-band improves the selectivity using less resonators.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Microstrip Compact Bandpass Filter Using High Permittivity Substrate

Hsu

Ho²,

Hsu³

2009

PIER Letters

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Abstract-A four-pole elliptic function compact bandpass filter is designed by using interdigital hairpin resonator and step-impedance hairpin resonator.The miniaturized band-pass filter is also implemented using high permittivity dielectric substrate. The fullwave simulator IE3D is used to design the compact hairpin resonator, and to calculate the coupling coefficient of the basic coupling strictures. The responses of the fabricated filters using Al 2 O 3 (ε r = 9.7, Q × f = 350000 GHz) and 0.6Sm(Co 1/2 Ti 1/2 )O 3 -0.4CaTiO 3 (ε r = 37, Q × f = 43000 GHz) dielectric substrates are designed at a center frequency of 2 GHz. The size of the compact hairpin filter using 0.6Sm(Co 1/2 Ti 1/2 )O 3 -0.4CaTiO 3 ceramic substrate, as compared to that of a compact hairpin filter using Al 2 O 3 ceramic substrate, is reduced in size by 45%. The compact size and good agreement have been obtained between simulations and implementation results.

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General Four-Resonator Filters at Microwave Frequencies (Correspondence)

Cited by 76 publications

References 3 publications

Microstrip Realization of Trisection Synthesis With Frequency-Dependent Admittance Inverter

Microstrip Realization of Trisection Synthesis With Frequency-Dependent Admittance Inverter

Novel Implementation of Transversal Filters in Multilayered Microstrip Technology

Hybrid Microstrip Compact Bandpass Filter Using High Permittivity Substrate

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