Stepped-Impedance Coupled Resonators for Implementation of Parallel Coupled Microstrip Filters With Spurious Band Suppression

Worapishet, A.; Srisathit, K.; Surakampontorn, W.

doi:10.1109/tmtt.2012.2190743

Cited by 23 publications

(5 citation statements)

References 22 publications

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“…The filter is composed of six grounded middle stub E-shape microstrip structures connected in cascade using short sections of the microstrip line. In [13] stepped-impedance coupled resonators (SICR) for implementation of parallel coupled microstrip filters are proposed with spurious band suppression. The SICR relies upon the incorporation of different stepped impedances for even and odd propagation modes of the coupled microstrip lines.…”

Section: Related Workmentioning

confidence: 99%

Design of Grooved Microstrip Patch Resonator Filters for Mobile Communication

Kushwah

Tomar

Bhadauria

2016

IJFGCN

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Section: Related Workmentioning

confidence: 99%

Design of Grooved Microstrip Patch Resonator Filters for Mobile Communication

Kushwah

Tomar

Bhadauria

2016

IJFGCN

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“…A non-uniform resonator known as a stepped impedance resonator (SIR) was introduced in [24] and was widely used to control spurious frequencies for wide stopband characteristics. In [25,26], parallel coupled line SIR BPFs were synthesised with various stepped impedance ratios (K). However, these conventional SIR BPFs also require image impedance of a coupled line equalled to the termination impedance (i.e.…”

Section: Introductionmentioning

confidence: 99%

Impedance matching bandpass filter with a controllable spurious frequency based on λ /2 stepped impedance resonator

Kim

Chaudhary

Jeong

2018

IET Microwaves, Antennas & Propagation

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An impedance matching bandpass filter (BPF) with arbitrary image impedance (Z2) of parallel/antiparallel coupled lines SIR is presented in this study. The proposed structures consist of conventional SIRs and additional transmission lines with an electrical length of π/2–θ2 at the input and output ports. Moreover, the coupling coefficients of the coupled line can be controlled by the image impedance and it does not affect the bandpass responses. Since the first spurious frequency of the conventional SIR BPF can be suppressed with a transmission zero by using antiparallel coupled lines, the proposed BPF can provide wide stopband and high attenuation characteristics. For the experimental validation of the proposed filter, three types of BPFs with 20–50 and 50–100 Ω termination impedances were designed and fabricated at the operating centre frequency (f0) of 2.6 GHz. By using the antiparallel coupled line instead of the parallel coupled line, the first spurious frequency is occurred at 3.71f0 and the stopband rejection considerably improved.

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“…According to their operation mechanism, these reported design methods can be mainly classified into four categories. The first one uses stepped-impedance resonators (SIRs) to push the high-order modes far away from the passband and to relocate the high-order modes of each resonator at dissimilar frequencies, such as quarter-wavelength SIRs [2, 3], half-wavelength SIRs [4–6] or modified SIRs [7–10]. Generally, each SIR of these BPFs need to be precisely specified, not only to form the bandpass response but also to prevent the high-order modes from constructing the spurious bands.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of compact wide bandpass filter with ultra-wide stopband using multi-stub loaded resonator

Tang

2016

Int. J. Microw. Wireless Technol.

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A compact microstrip multi-stub loaded bandpass filter (BPF) with ultra-wide stopband is introduced and investigated. Lumped-equivalent circuit (LEC) method is adopted to analyze the characteristics of the in-band response based upon the low frequency LEC and even-odd mode analytical method. Besides, equivalent transmission line circuit method with even-odd mode analytical method are adopted to discuss the mechanism of the out-band rejection based upon the transmission poles and the transmission zeros analysis of the even-/odd-mode equivalent circuits. Accordingly, the design and the optimization procedures of this type of filters are summarized. To experimentally validate the proposed method, the filter is fabricated and measured. The measured results illustrate this BPF centered at f0 = 2.8 GHz, with −3 dB fractional bandwidth of 109.3%, the insert loss (IL) of less than 1 dB from 1.4 to 4 GHz, and the rejection level of 20 dB from 5.1 to 33.5 GHz(1.82f0 to 11.96f0).

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Stepped-Impedance Coupled Resonators for Implementation of Parallel Coupled Microstrip Filters With Spurious Band Suppression

Cited by 23 publications

References 22 publications

Design of Grooved Microstrip Patch Resonator Filters for Mobile Communication

Design of Grooved Microstrip Patch Resonator Filters for Mobile Communication

Impedance matching bandpass filter with a controllable spurious frequency based on λ /2 stepped impedance resonator

Analysis and design of compact wide bandpass filter with ultra-wide stopband using multi-stub loaded resonator

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