Hairpin Tunable Bandpass Filter with Improved Selectivity and Tunability

Choi, Seung-Un; Chung, Moon-Seok; Yun, Sang‐Won

doi:10.1109/apmc.2007.4555061

Cited by 14 publications

(5 citation statements)

References 13 publications

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“…Alternatively, microstrip-line circuits are popular owing to their merits such as low cost, compact size and easy integration. Numerous bandpass filters adopting different approaches to produce transmission zeros at the lower and upper stopbands have been reported [1][2][3][4][5][6]. In this Letter, a rotationally symmetric short-circuited stubloaded structure is proposed in the design of a microstrip-line bandpass filter with two transmission zeros near the lower and upper cutoff frequency edges of operating mmW bands.…”

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confidence: 99%

Rotationally symmetric microstrip-line millimetre-wave bandpass filter with two transmission zeros

2011

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A rotationally symmetric short-circuited stub-loaded structure is proposed. This structure is used to design a dual-mode microstrip-line bandpass filter. Moreover, two transmission zeros are generated near the lower and upper cutoff frequency edges of operating millimetrewave bands. As design examples, the in-band and out-of-band performances of one filter prototype using single layer microstrip-lines have been designed and experimentally examined. The measured results show that the filter achieves a passband insertion loss of 0.97 dB at 40 GHz and lower-and upper-stopband rejection of larger than 24 dB.

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confidence: 99%

Rotationally symmetric microstrip-line millimetre-wave bandpass filter with two transmission zeros

2011

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“…Numerous bandpass filters, adopting different approaches to produce transmission zeros at the lower and upper stopbands have been reported in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A straightforward way to produce two transmission zeros is to use two shunt open-circuited stubs of different lengths [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Wong¹,

Wang²,

Chen³

et al. 2013

PIER

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Abstract-A rotationally symmetric short-circuited stub-loaded structure is proposed to design a microstrip-line bandpass filter with two transmission zeros near the lower and upper cut-off frequency edges of operating millimeter-wave bands. Furthermore, interdigital coupled-lines and additional resonators are integrated into the proposed rotationally symmetric bandpass filter to improve the out-of-band rejection. As design examples, the in-band and out-of-band performances of two filter prototypes using single layer microstrip-lines are designed and experimentally examined. The measured results show that the filter without any interdigital coupledlines achieves a passband insertion loss of 0.97 dB at 40 GHz and out-ofband rejection of larger than 23 dB, while the filter with the interdigital coupled-lines realizes the suppressions in lower and upper-bands of, respectively, larger than 30 dB and 19 dB for the overall insertion loss of 2.1 dB at 40 GHz.

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“…Besides, the coupling coefficient of J, K-inverter varies with changing the tuning frequency [7]. In this end-coupled bandpass filter, we can control coupling values between resonators by using varactor diodes, replacing the capacitive component of the J-inverter with varactor diodes.…”

Section: Tunability and Coupling Relationmentioning

confidence: 99%