Characterizing and Modeling Conductor-backed CPW Periodic Band Stop Filter with Miniaturized Size

Ma, Kaisheng; Xiao, Shaoqiu; Chan, K.T.; Yeo, Kiat Seng; Ma, Jan; Anh, Manh

doi:10.1109/mwsym.2007.380184

Cited by 7 publications

(1 citation statement)

References 21 publications

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“…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%

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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