Wide-Stopband Bandpass Filters Using Asymmetric Stepped-Impedance Resonators

Kim, Chan Ho; Chang, Kai

doi:10.1109/lmwc.2012.2236885

Cited by 65 publications

(39 citation statements)

References 8 publications

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“…At last, we mention a method based on coincidence frequencies of spurious bands and transmission zeros generated and properly located due to special configuration of the filter's structure [5]. Obviously, this method is rather complicated.…”

Section: Introductionmentioning

confidence: 99%

A Method of Stopband Widening in BPF Based on Two-Conductor Suspended-Substrate Resonators

Сержантов¹,

Govorun²,

Afonin³

et al. 2018

PIER Letters

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Abstract-A method aiming to widen the upper stopband in a microwave bandpass filter based on two-conductor suspended-substrate stripline resonators is described in this letter. Applicability of the method is illustrated by simulating and fabricating fourth-order filter that has a very wide upper stopband: Δf stop /f 0 = 7.92 measured at a level −50 dB, which is achieved because the widths of the inner resonators in the structure are 1.4 times greater than that of the outer ones.

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Section: Introductionmentioning

confidence: 99%

A Method of Stopband Widening in BPF Based on Two-Conductor Suspended-Substrate Resonators

Сержантов¹,

Govorun²,

Afonin³

et al. 2018

PIER Letters

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“…With the rapid development of modern communication system, compact planar filters have experienced an explosive growth [1,2]. It is urgent to increase demand on wide stopband filter [3,4] with compact size, high selectivity, and good stopband performance, etc.…”

Section: Introductionmentioning

confidence: 99%

A Compact Quarter-Mode Siw Bandpass Filter With an Extremely Wide Stopband

Yang¹,

Li²,

Wu³

et al. 2017

PIER Letters

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Abstract-This paper presents a C-band wide stopband bandpass filter (BPF) using quarter mode substrate integrated waveguide (QMSIW) cavities. The BPF is simply constructed by combining Sshaped slot and L-shaped slot loaded quarter-mode substrate integrated waveguide. A special negative coupling scheme with symmetrical S-shaped slots on the top and bottom metal planes connected by metallic vias is developed. The proposed structure provides more design flexibility in arranging the pitch of vias owing to the extended slot length. The filter has fractional bandwidth of 25% at center frequency of 5.5 GHz with return loss better than 24 dB and insertion loss less than 1.1 dB. Moreover, its first spurious response occurs at 22.5 GHz (about four times the central frequency), exhibiting an extremely wide stopband performance. An experimental SIW filter was fabricated, and good agreement was achieved between the simulated and measured results.

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“…However, it increases the filter area and introduces extra insertion loss. The use of stepped-impedance resonators is a typical way to suppress harmonics [10], [11]. Another harmonic suppression method is to introduce transmission zeros at the harmonic frequencies, such as the defected ground structure [12], [13] and the cross coupling [14], [15].…”

Section: Introductionmentioning

confidence: 99%

Microwave and Millimeter-Wave LTCC Filters Using Discriminating Coupling for Mode Suppression

Guo

Zhang

Gao

et al. 2016

IEEE Trans. Compon., Packag. Manufact. Technol.

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In this paper, a new discriminating coupling mechanism, which is realized by choosing suitable coupling region between the feeding lines and resonators, is proposed to suppress the unwanted resonance modes without affecting the desirable operating modes. Utilizing such a coupling mechanism, two low-temperature cofired ceramic (LTCC) bandpass filters (BPFs) are designed operating at microwave and millimeter-wave bands. One BPF realizes a wide stopband, since the third and fifth harmonics are suppressed by the discriminating coupling. The other one is an oversized 60-GHz BPF with the fundamental mode suppressed by the discriminating coupling. Due to the multilayer characteristics of the LTCC techniques, the circuit layout can be controlled flexibly to realize desirable discriminating coupling. The two filters are theoretically analyzed and implemented. Good agreement between the simulation and the measurement validates the proposed method.

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Wide-Stopband Bandpass Filters Using Asymmetric Stepped-Impedance Resonators

Cited by 65 publications

References 8 publications

A Method of Stopband Widening in BPF Based on Two-Conductor Suspended-Substrate Resonators

A Method of Stopband Widening in BPF Based on Two-Conductor Suspended-Substrate Resonators

A Compact Quarter-Mode Siw Bandpass Filter With an Extremely Wide Stopband

Microwave and Millimeter-Wave LTCC Filters Using Discriminating Coupling for Mode Suppression

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