Hexagonal dual-mode filter with four transmission zeros

Wei, Chaolei; Jia, Baofu; Zhu, Zhaojun; Tang, Ming‐Chun

doi:10.1049/el.2010.3291

Cited by 15 publications

(12 citation statements)

References 5 publications

(5 reference statements)

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“…Many papers report the effects of the numbers and the locations of the transmission zeros and how to control them [5]- [7]. [5] gives the relationship between the transmission zero location and the resonant frequency: when f is the center frequency).…”

Section: Introductionmentioning

confidence: 99%

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Compact Wide Stop-Band Dual-Mode Filter with Four Transmission Zeros

Xue¹,

Ji²

2016

IJCEE

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Abstract:The size and the isolation of filters impact directly the whole front-end system integration and performance. The miniaturization and high-isolation of filters is always a hot spot of research. In this paper, a compact high-isolation band-pass filter is designed based on the dual mode short-ended resonator. The technique of the stepped-impedance lines can adjust the stop-band width by the length and width of the lines. In the designing process, the length of the feeders computed in an easy and effective way is given to provide the estimated value. The capacitive source-load coupling provides four transmission zeros to enhance the selectivity. The area of this filter, of which the chamfer micro-strips are used to decrease the size, is only 36.7% of the traditional ones. In addition, the characteristics of this filter are analyzed, from which the design graph is given and the measured results match well with the simulations.

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Section: Introductionmentioning

confidence: 99%

“…However, this kind of filter have a relatively large structure. [7] reports a hexagonal dual-mode filter with inductive-stub loaded; by adjusting parameters of inductive-stub to the filter, the filter can have four transmission zeros, which can improve the selectivity of the pass-band efficiently.…”

Section: Introductionmentioning

confidence: 99%

Compact Wide Stop-Band Dual-Mode Filter with Four Transmission Zeros

Xue¹,

Ji²

2016

IJCEE

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“…To improve the frequency selectivity of filters, transmission zeros (TZs) are usually realized by various methods, such as nonadjacent coupling and mixed electric/magnetic (EM) coupling. The nonadjacent coupling techniques, including cross-coupling (Chang & Chen, 2003;Liao & Chang, 2005;Lu et al, 2008;Cai et al, 2011) and source-load coupling (Shaman & Hong, 2007;Dai & Xia, 2010;Wu et al, 2010;Wei et al, 2011;Athukorala & Budimir, 2012), generate TZs by providing a multipath effect. Recently, mixed EM coupling was investigated to generate TZs (Ma et al, 2006;Chu & Wang, 2008;Wei et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Bandpass Filter with Mixed Electric and Magnetic Coupling Using Hexagonal Stepped Impedance Resonators

Wei

Yue

et al. 2013

Electromagnetics

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A miniaturized fourth-order direct-coupled bandpass filter with good stopband responses using hexagonal stepped-impedance resonators is presented. Based on the odd-and even-mode equivalent circuits, the resonance characteristics of the hexagonal stepped-impedance resonators with mixed electric/magnetic coupling are investigated. Multiple finite-frequency transmission zeros are realized in the stopband but without introducing either cross-coupling between nonadjacent resonators or source-load coupling between input/output ports. The frequency-dependent coupling matrix of the proposed filter is presented. A new bandpass filter centered at 2.45 GHz with 6.5% fractional bandwidth has been designed and fabricated to verify the validity of the proposed method. The measurement result shows four finite transmission zeros in the stopband, located at 0.98 GHz with 73.14-dB rejection, 2.10 GHz with 48.18-dB rejection, 2.75 GHz with 53.80-dB rejection, 3.12 GHz with 57.08-dB rejection, respectively. The circuit only occupies 15:9 9:0 mm 2 .

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“…So it is very important to design the filters with good performance. Microstrip filters have been widely used in many applications since its low cost, cheap production and easy fabrication [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Compact box-section bandpass filter with enhanced stopband characteristics

MingxiaZhang

Wei

Yuan

2013

2013 International Workshop on Microwave and Millimeter Wave Circuits and System Technology

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A compact bandpass filter (BPF) with enhanced stopband characteristics is presented in this paper. The proposed BPF consists of four improved stepped impedance resonators (SIRs),which implements into a boxsection strcture. To improve the frequency selectivity and the stopband characteristics, additional transmission zero (TZ) was introduced by mixed electric and magnetic (EM) coupling. A new filter with 31.2% fractional bandwidth (FBW) has been designed and fabricated to verify the validity of the proposed method. The filter has two transmission zeros, where TZ 1 is located in 0.4GHz with 78.7dB rejection and TZ 2 is located in 2.7GHz with 50.2 dB rejection. Measured results are in good agreement with the electromagnetic simulation.Index Terms -bandpass filter, box-section, transmission zeros, mixed coupling .

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Hexagonal dual-mode filter with four transmission zeros

Cited by 15 publications

References 5 publications

Compact Wide Stop-Band Dual-Mode Filter with Four Transmission Zeros

Compact Wide Stop-Band Dual-Mode Filter with Four Transmission Zeros

Miniaturized Bandpass Filter with Mixed Electric and Magnetic Coupling Using Hexagonal Stepped Impedance Resonators

Compact box-section bandpass filter with enhanced stopband characteristics

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