Synthesis Design of a Wideband Bandpass Filter With Inductively Coupled Short-Circuited Multi-Mode Resonator

Zhang, Runqi; Li, Zhu

doi:10.1109/lmwc.2012.2218096

Cited by 37 publications

(31 citation statements)

References 8 publications

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“…For Butterworth response is normally equal to 3 dB, and thus, . By using (18) and (19), a third-order Butterworth response or a three-pole Chebyshev filter with equal ripple can be readily designed. In addition, as in the previous discussion, the solution for Butterworth filters is exact, but the design (19e) and (19f) provide approximated solutions because is not a standard third-order Chebyshev polynomial.…”

Section: B Double-section Differential Filtermentioning

confidence: 99%

“…For the Butterworth response, a 3-dB FBW of 100% is used, while for the Chebyshev type, an equal-ripple FBW of 60% is selected. The design of these filters is carried out by means of (14a) and (18) for the Buttherworth response, and (14b) and (19) with dB for the Chebyshev function. From these curves, it can be deduced that the Chebyshev response, with two or three transmission poles, is more suitable to achieve wideband bandpass filters with a good selectivity.…”

Section: B Double-section Differential Filtermentioning

confidence: 99%

“…Once these values are known by means of either design formula (14a), (14b), (18), or (19), the required even-and odd-mode impedances can be calculated, from (5) …”

Section: B Double-section Differential Filtermentioning

confidence: 99%

“…It can be demonstrated that the differential-to-differential -parameters of the filter only depends on the design of the odd-mode equivalent circuit. The synthesis procedure, as in [16]- [18], is carried out by computing and equating the transfer functions of the proposed filters to Butterworth or Chebyshev filtering functions. Thus, the theory given in [19] for bandpass filters is extended and generalized to obtain closed-form design formulas.…”

Section: Introductionmentioning

confidence: 99%

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Analytical Design of Wire-Bonded Multiconductor Transmission-Line-Based Ultra-Wideband Differential Bandpass Filters

Sánchez-Martínez

Márquez-Segura

2014

IEEE Trans. Microwave Theory Techn.

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A systematic design process of ultra-wideband differential bandpass filters based on wire-bonded multiconductor transmission lines is presented. The topology is thoroughly analyzed by means of analytical design equations that provide some insights into the physical behavior of the proposed structure. Single-and double-section configurations are introduced and exact closed-form design equations are derived to design differential filters with either a Butterworth or Chebyhsev frequency response. To validate the design procedure, two differential filters are designed and fabricated with an equal-ripple fractional bandwidth (FBW) of 100% and 60% (3-dB FBW of 145% and 97%), respectively. The measured differential-mode responses show a good in-band flatness with insertion losses lower than 1 dB and with high common-mode rejection levels greater than 20 dB. Experimental results demonstrate a good agreement with theory and prove that the proposed design methodology is useful for accurate and fast ultra-wideband differential filter synthesis.

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Section: B Double-section Differential Filtermentioning

confidence: 99%

Section: B Double-section Differential Filtermentioning

confidence: 99%

“…Once these values are known by means of either design formula (14a), (14b), (18), or (19), the required even-and odd-mode impedances can be calculated, from (5) …”

Section: B Double-section Differential Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical Design of Wire-Bonded Multiconductor Transmission-Line-Based Ultra-Wideband Differential Bandpass Filters

Sánchez-Martínez

Márquez-Segura

2014

IEEE Trans. Microwave Theory Techn.

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“…However, RF filters present several problems of spurious responses mainly due to the presence of the second harmonic if such conventional designs are used. Various filters are designed with different methods, in order to obtain wide bandwidth, wide upper stopband, and high selectivity [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Methods using the three-line microstrip coupled structure, split ring resonators (SRRs), multimode resonators, open-ended stubs, transversal signal interaction concepts and defected ground surface have been introduced for the WBPF designs with good wideband responses.…”

Section: Introductionmentioning

confidence: 99%

A Novel Wideband Bandpass Filter Using Coupled Lines and T-Shaped Transmission Lines With Wide Stopband on Low-Cost Substrate

Yechou¹,

Tribak²,

Kacim³

et al. 2016

PIER C

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Abstract-This paper presents the design, simulation, fabrication and measurement of a wideband bandpass filter with wide stopband performance operating at 3.5 GHz. The proposed filter consists of two parallel coupled lines (T-PCL) centred by T-inverted shape. The location of transmission zeros can be adjusted by varying the physical lengths of T-inverted shape to improve the filter selectivity. The wide bandwidth is achieved through enhanced coupling between the input and the parallel coupled lines. Due to the transmission zeros in the lower and upper stopbands, the filter exhibits good performance including an extremely wide stopband and sharp attenuations near the passband together with low insertion and good return losses in the passband. The filter performance is investigated numerically by using CST-MWS. Finally, the microstrip wideband BPF with minimum insertion losses 0.3 dB, centred at 3.5 GHz with a 3-dB fraction bandwidth of 70% and four transmission zeros is implemented and verified experimentally. In addition, good agreement between the simulated and measured results is achieved.

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Wide passband/stopband bandpass filter based on transversal signal interference concepts and modified branch-line structure

Chen

2014

Int J RF and Microwave Comp Aid Eng

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A high selectivity wide passband filter with a broader stopband based on transversal signal-interaction concepts and modified branch line structure (MBLS) is developed in this article. Two transmission paths, that is, one half-wavelength transmission line and one MBLS, are used to realize signal transmission from Port 1 to Port 2. Then, two transmission zeros are introduced at both lower and upper sides of the passband, which are used to improve the passband selectivity greatly. The filter bandwidth can be easily controlled by reasonable adjusting the coupling coefficient of the coupled lines. Furthermore, with four stubs connected at the input/output ports, the stopband attenuation level is improved greatly. Finally, one prototype filter having 69.1% of 3 dB fractional bandwidth is fabricated with advantages of sharp selectivity and high out-of-band rejection. The EM simulated and measured results are presented, and an excellent agreement can be obtained.

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Synthesis Design of a Wideband Bandpass Filter With Inductively Coupled Short-Circuited Multi-Mode Resonator

Cited by 37 publications

References 8 publications

Analytical Design of Wire-Bonded Multiconductor Transmission-Line-Based Ultra-Wideband Differential Bandpass Filters

Analytical Design of Wire-Bonded Multiconductor Transmission-Line-Based Ultra-Wideband Differential Bandpass Filters

A Novel Wideband Bandpass Filter Using Coupled Lines and T-Shaped Transmission Lines With Wide Stopband on Low-Cost Substrate

Wide passband/stopband bandpass filter based on transversal signal interference concepts and modified branch-line structure

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