A Compact Open-Loop Filter With Mixed Electric and Magnetic Coupling

Chu, Qing‐Xin; Wang, Huan

doi:10.1109/tmtt.2007.914642

Cited by 293 publications

(161 citation statements)

References 16 publications

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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%

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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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Section: Introductionmentioning

confidence: 99%

“…Recently, an open-loop filter with mixed coupling was studied for its transmission zeros at the lower and upper stopbands [17] and dualmode loop resonator also can achieve transmission zeros to improve out-of-band rejection [18,19].…”

Section: Introductionmentioning

confidence: 99%

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Wong¹,

Wang²,

Chen³

et al. 2013

PIER

Self Cite

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show abstract

“…The comparison with some reported similar BPFs is presented in Table 1 [13][14][15][16][17][18]. It shows that the proposed filter achieves wider bandwidth except the design in [18], lower insertion loss except the design in [14], lower group delay variation in the passband range, smaller size and better frequency selectivity.…”

Section: Resultsmentioning

confidence: 90%

“…Another coupling path is magnetic coupling, which is realized by a high-impedance line that connects the two resonators (1 and 2 or 3 and 4) and acts as a coupling inductance. From [16], the TZs induced by mixed electric and magnetic couplings can be controlled by choosing different electrical and magnetic couplings. TZ is located at the lower frequency when the magnetic coupling is dominant and located at the higher frequency when the electric coupling is dominant.…”

Section: Transmission Zeros Analysismentioning

confidence: 99%

A Compact Wide Bandpass Filter With Good Selectively

Shen¹,

Lin²,

Ai³

et al. 2017

PIER C

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Abstract-A compact Ku-band bandpass filter (BPF) with wide passband, compact size and high selectively is presented. The presented BPF is composed of two quarter-wavelength resonators and a dual-mode resonator, resulting in a compact circuit size. The transmission zeros (TZs) located at the lower and upper stopband are achieved by the mixed electromagnetic (EM) coupling and dual-mode resonator, respectively, resulting in a high frequency selectively. The measured results show minimum in-band insertion loss, fractional bandwidth and variation of group delay to be 0.9 dB, 36.2% and 0.12 ns, respectively. Also, the stopband suppression is greater than 28 dB from 5 to 10.3 GHz and 30 dB from 19.5 to 29.5 GHz. The effective circuit size of the filter is 8.43 × 2.28 mm 2 (0.63λ g × 0.17λ g , where λ g is the guide wavelength of 15.1 GHz).

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“…In order to realize the desired coupling coefficient k of the sub filter for 3.5-GHz passband, the tap d 1 and gap s 4 of the ESIR are found to be the critical design parameter to dominate the k. Due to the geometric limitation of the main structure, the sub filter can only employ non 0 • -feed coupled structure rather than 0 • -feed coupled structure [25], where no transmission zeros will appear. In this work, however, the mixed electric and magnetic coupling [26] between two SIRs are applied to obtain an extra transmission zero. Thus, the passband selectivity and stopband rejection of the filter can be effectively improved.…”

Section: Analysis Of the Esirmentioning

confidence: 99%

Novel Design of a Compact Triple-Band Bandpass Filter Using Short Stub-Loaded Sirs and Embedded Sirs Structure

Zhang²,

Li³

et al. 2013

PIER

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Abstract-A novel compact planar triple-band bandpass filter using two sets of short stub-loaded stepped impedance resonators (SSLSIRs) and a pair of embedded stepped impedance resonators (ESIRs) has been proposed. The SSLSIRs can adjust the bandwidths of the corresponding passbands over a wide range, and the ESIRs employing non 0 • -feed coupled structure with mixed electric and magnetic coupling can obtain an extra transmission zero. The embedded resonators structure can further miniaturize the dimensions of the whole triple-band filter. The operating frequencies of the SSLSIRs and ESIRs are designed for the applications of the WLAN (2.45/5.2 GHz) and WiMAX (3.5 GHz) systems, respectively. The simulated and measured results are both presented and show good agreement.

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A Compact Open-Loop Filter With Mixed Electric and Magnetic Coupling

Cited by 293 publications

References 16 publications

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

A Compact Wide Bandpass Filter With Good Selectively

Novel Design of a Compact Triple-Band Bandpass Filter Using Short Stub-Loaded Sirs and Embedded Sirs Structure

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