Synthesis design of a wideband impedance transformer consisting of two‐section coupled lines

Wu, Qiong‐Sen; Li, Zhu

doi:10.1049/iet-map.2016.0323

Cited by 11 publications

(12 citation statements)

References 26 publications

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“…Whereas for second couple line section, the impedances of MSC2 are Zoe2 and Zoo2. The S-Parameters of S11 and S12 in (21) and (22) respectively can only be applied for this 2 nd order resonator for a given center frequency.…”

Section: Nd Order Bandpass Filtermentioning

confidence: 99%

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Inter-connected coupled lines Resonator topology for bandpass filter application

Hushim¹,

Wahab²,

Zin³

et al. 2020

IJECE

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This paper presents an inter-connected side-shorted coupled-line resonator topology as a base cell. The base cell is built from two single-shorted quarter-wavelength coupled-line sections, connected in series to give a half-wavelength coupled-line that creates a single resonance of bandpass filter response. Higher-order bandpass filter is produced by adding new single-shorted coupled-line sections, cascaded in an inter-connected manner to the base cell. This new topology creates a unique arrangement that caused cross coupling effects between the resonators, resulting to the occurrence of transmission zeros that lead to the improvement of selectivity of the higher order bandpass filter response. For validation of concept, 2nd and 3rd order bandpass filters were fabricated using microstrip technology on Roger 3210 substrate with parameter of Ɛr = 10.2, h = 1.27 mm and tan δ = 3x10-3. The filters were measured and the results show good agreement with simulation results.

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Section: Nd Order Bandpass Filtermentioning

confidence: 99%

“…We observed that the proposed concept has advantages in terms of availability of synthesis, exhibit transmission zero and narrow bandwidth of less than 6% compared to others. [20] Yes No 10 % [21] Yes No 50 % [22] No Yes 5.69 % [23] No Yes 80 % [24] No Yes 98.73 % [25] No Yes 52.17% [26] No…”

Section: Nd and 3 Rd Order Filter Realizationmentioning

confidence: 99%

Inter-connected coupled lines Resonator topology for bandpass filter application

Hushim¹,

Wahab²,

Zin³

et al. 2020

IJECE

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“…Although the high r and filtering response were obtained, they only achieved a fractional bandwidth (FBW) of 8.27%. Similarly, a multilayer two cascade parallel coupled lines IT with FBW of 50% was presented in 4 with r = 2. On the other hand, the wideband ITs using quarter‐wavelength ( λ /4) parallel coupled line with air bridge connection stepped impedance transmission line (TL) and open/short‐circuited TLs were designed in the microstrip line 5‐9 .…”

Section: Introductionmentioning

confidence: 99%

High selectivity and wideband bandpass filtering impedance transformer

Kim

Jeong

2021

Int J RF Microw Comput Aided Eng

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An impedance transformer (IT) with wideband and high selectivity is presented in this paper. Three transmission poles were obtained within the passband and provides a wide passband response. Moreover, there are two transmission zeros (TZs) close to the passband that were achieved by a shunt parallel coupled line and provide high selectivity. For validation of proposed circuit, the ITs were designed at a center frequency (f0) of 3.5 GHz using an impedance‐transforming ratio (r) of 5 and 10. For r = 5, |S21| and |S11| are 0.36 dB and 28 dB at f0, respectively. Within the passband, |S21| and |S11| are better than 0.65 dB and 18 dB, respectively. The TZs at 2.65 GHz (0.76f0) and 1.22f0, close to the passband, were measured with attenuation better than 37 dB. The out‐of‐band attenuations are higher than 20 dB from DC to 2.77 GHz of the lower stopband and from 4.16 GHz to 9.73 GHz of the higher stopband. For r = 10, |S21| = −1.4 dB and |S11| = −23 dB were measured at f0. An 18 dB return loss was obtained from 3.415 GHz to 3.694 GHz (FBW = 7.96%).

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“…The highest impedance ratio is stated as 520:5. In [5–8 ], filtering impedance transformer synthesised by transmission function is studied in depth. Moreover, in [9 ], impedance transforming bandpass filter with controllable spurious frequency based on λ /2 stepped impedance resonator is designed.…”

Section: Introductionmentioning

confidence: 99%

Design of filtering impedance transformer with high impedance ratio

Guo

2020

Electron. lett.

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A kind of impedance transformer with high impedance ratio based on tapped coupled‐resonator filter theory is proposed. Differently with the published ones, the proposed filtering transformer incrementally takes impedance property of the filter into consideration. Thus, the high impedance ratio can be achieved. By proper design of impedance and type of resonator, two prototypes with impedance ratios as high as 400:50 and 800:50 and 3‐dB fractional bandwidths of 20.2 and 22.8% are realised.

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Synthesis design of a wideband impedance transformer consisting of two‐section coupled lines

Cited by 11 publications

References 26 publications

Inter-connected coupled lines Resonator topology for bandpass filter application

Inter-connected coupled lines Resonator topology for bandpass filter application

High selectivity and wideband bandpass filtering impedance transformer

Design of filtering impedance transformer with high impedance ratio

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