A novel planar multimode bandpass filter with radial perturbation

Ma, Kaixue; Yeo, Kiat Seng; Sun, Qiang

doi:10.1002/mop.24258

Cited by 7 publications

(8 citation statements)

References 10 publications

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“…The higher order RLTRS LPF by cascading multiple RLTRS cells is designed to further improve the rejection depth and the skirt selectivity. The fourcell RLTRS LPF topology based on cell network cascading in [8] is shown in Fig. 5(a).…”

Section: High Order Radial Loaded Trs Lpf Designmentioning

confidence: 99%

“…It is adopted to remove undesired harmonics or spurious of the nonlinear circuits in RF front-end. Wide stopband and high stopband rejection are important for LPF to improve the linearity and signal over noise ratio especially in the high data rate and wideband communication systems [1][2][3][4][5][6][7][8][9][10][11][12]. A good LPF is needed to suppress the mixed frequency elements and leakages of radio frequency (RF) and local oscillator (LO) frequency from the mixer.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, defected ground structure (DGS) usage in the LPFs for wide stopband has been demonstrated [4][5][6]. A new low pass configuration using transformed radial stubs (TRS), formed by the coupled line transformer connected with a radial stub (the radial stub has intrinsic wide stopband characteristics [7,8]), is proposed in [9,10]. The implemented LPF with a planar configuration and free of lumped resistor-inductor-capacitor (R-L-C) elements demonstrates an ultra-wide stopband stopband rejection better than 25 dB up to 24 GHz (8 f c ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Radial Loaded Transformed Radial Stub for LPF Stopband Extension

Ma¹,

Mou²,

Wang³

et al. 2012

PIER Letters

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Abstract-A low pass filter with ultra-wide band rejection and compact size using a proposed radial loaded transformed radial stubs is introduced and investigated. The implemented unite cell low pass filter with 1-dB cutoff frequency f c of 3.2 GHz demonstrates stopband rejection up to 11.8 f c , i.e., 38 GHz. The design is further extended to the high-order LPF through cell cascading. The implemented four-cell LPF with f c of 3.6 GHz demonstrated 35 dB rejection from 4.8 GHz to 39 GHz, 50 dB rejection from 5.4 GHz to 26 GHz (7.2 f c ) and 20 dB rejection from 4.4 GHz to 50 GHz (13.8 f c ). The measured passband insertion loss is less than 1.7 dB, and group delay is 0.45 ∼ 0.8 nS. The size of the four-cell low pass filter is only 0.33λ g × 0.135λ g , (λ g is the guide wavelength at center cutoff frequency) without using any lumped elements.

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Section: High Order Radial Loaded Trs Lpf Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Radial Loaded Transformed Radial Stub for LPF Stopband Extension

Ma¹,

Mou²,

Wang³

et al. 2012

PIER Letters

Self Cite

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“…All this kind of filters using stub-loaded structure have a good selectivity for the transmission zeros are close to the passband. The radial-line stubs have been found to work better than low impedance rectangular stubs when an accurate localization of a zero-point impedance is needed, and it can maintain the lower impedance level over a wide frequency range and a smaller outer dimension [14,15].…”

Section: Introductionmentioning

confidence: 99%

Novel Planar Multimode Bandpass Filters With Radial-Line Stubs

Zhang¹,

Yu²,

Mo³

2010

PIER

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Abstract-This paper presents a novel approach for designing planar multimode wideband bandpass filters with good selectivity. The multimode resonator is composed of an open-ended microstrip line with length of half-wavelength (λ/2) and several radial-line stubs. By using different kinds of radial-line loaded stubs, different kinds of responses including three-pole and four-pole bandpass filters can be realized. Depending on electric field distribution and equivalent circuit model, the characteristics of the filter are analyzed. To verify the proposed method, two filters are implemented. The measured results exhibit good agreement with the simulation.

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“…Recently, Xue et al [9] proposed a compact microstrip resonant cell (CMRC) structure, which is essentially a triple-mode resonator. A novel multimode bandpass filter with good rejection band is proposed by using a radial-line stub in [10]. A modified circular resonator with etched slots was employed to design triplemode filter [11].…”

Section: Introductionmentioning

confidence: 99%

Design of Triple-Mode Bandpass Filter Using Improved Hexagonal Loop Resonator

Mo¹,

Yu²,

Zhang³

2009

PIER

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Abstract-A novel triple-mode hexagonal bandpass filter with capacitive loading stubs is introduced in this article. The technique, adding an open capacitive stub, is applied to enlarge the equivalent selfcapacitance of the resonator, which declines its resonant frequencies. Three radial-line stubs in the center of top layer are used to implement this technique. One mode resonant frequency is varied with the radii of three radial-line stubs, while the other two modes are nearly not affected. This filter has a pair of transmission zeros which are close to the passband, thus it behaves with high selectivity. For method validation, a bandpass filter operating at 2.4 GHz is fabricated and measured. The experimental results are demonstrated and discussed.

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A novel planar multimode bandpass filter with radial perturbation

Cited by 7 publications

References 10 publications

Radial Loaded Transformed Radial Stub for LPF Stopband Extension

Radial Loaded Transformed Radial Stub for LPF Stopband Extension

Novel Planar Multimode Bandpass Filters With Radial-Line Stubs

Design of Triple-Mode Bandpass Filter Using Improved Hexagonal Loop Resonator

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