Broadband Filtering Power Dividers Using Simple Three-Line Coupled Structures

Xu, Kai‐Da; Bai, Yecheng; Ren, Xue; Xue, Quan

doi:10.1109/tcpmt.2018.2869077

Cited by 52 publications

(26 citation statements)

References 20 publications

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“…High-performance radio-frequency/microwave components and circuits are extensively desirable in the modern wireless communication systems, such as couplers [1], power dividers [2,3] and filters [4,5]. For the filters, bandstop filters (BSFs) are in great demand to block undesired signals or reject spurious harmonics.…”

Section: Introductionmentioning

confidence: 99%

Compact bandstop filters using coupled lines and open/short stubs with multiple transmission poles

Cai

et al. 2019

IET Microwaves, Antennas & Propagation

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A compact bandstop filter (BSF) using parallel‐coupled lines and open stubs with four transmission poles (TPs) is proposed. Through theoretical equation deduction, the positions of these four TPs can be obtained. Good roll‐off skirts and stopband suppression characteristics of the BSF can be realised with the help of multiple TPs. To improve transition band roll‐off rates, another BSF with five TPs is designed, where a short‐circuited T‐stub is loaded on the middle of the above BSF circuit structure. For demonstration, two filter examples with centre frequencies at 2 and 1.8 GHz are implemented with generation of four and five TPs, respectively, for theoretically calculated certification. Good agreement between simulated and measured results validates the design method.

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Section: Introductionmentioning

confidence: 99%

Compact bandstop filters using coupled lines and open/short stubs with multiple transmission poles

Cai

et al. 2019

IET Microwaves, Antennas & Propagation

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“…In Reference , a parallel coupled line loaded with two isolation resistors and two open‐ended stubs is employed to enhance isolation and matching of the output ports across a wideband frequency range. Additionally, a wideband filtering PD using three‐line coupled topology is proposed in Reference , but the theoretical analysis is complicated.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, filtering PDs were born to tackle this problem. 6 Recently, various techniques have been proposed to design high-performance filtering PDs, including parallel coupled line topologies, [7][8][9][10][11] substrate integrated waveguide 12 and signal-interference theory, 13 where the coupled line structures have been widely used in the design of PDs to realize the filtering characteristics of interest with relatively compact size. In Reference 8, a high-performance filtering PD using multiple pairs of coupled lines and open stubs is presented, where good roll-off rates can be obtained because of multiple transmission zeros (TZs).…”

Section: Introductionmentioning

confidence: 99%

Wilkinson filtering power divider using coupled lines and T‐shaped stub

2019

Micro & Optical Tech Letters

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A new Wilkinson filtering power divider (PD) with high performance has been presented. By employing four pairs of parallel‐coupled lines and a T‐shaped stub to construct the filtering PD, sharp roll‐off skirts and high stopband rejections can be achieved with three transmission poles and six transmission zeros. Theoretical deduction is presented to verify the proposed structure. For demonstration, a filtering PD example with center frequency of 2 GHz and 3‐dB fractional bandwidth of 48% is fabricated and measured. It is shown that the measured minimum insertion loss within the passband is less than 0.4 dB. The lower stopband rejection of over 17 dB and upper stopband rejection of more than 23 dB from 2.7 to 4.9 GHz can be achieved. The measured isolations between two output ports are greater than 20 dB within the passband.

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“…High-selectivity bandpass filters (BPFs) with low insertion loss in the passband and high rejection in the stopband are drawing increasing attentions to meet the requirement of the modern wireless communication systems [1]. Recently, some works have been reported on introducing transmission zeros (TZs) to improve the out-of-band suppression of BPFs [2][3][4][5][6][7][8][9][10][11][12][13]. In [2][3][4], signal interference techniques have been invented for the generation of multiple TZs due to the construction of multiple transmission paths.…”

Section: Introductionmentioning

confidence: 99%

“…12 , I 7 = -I 12 , andI 4 = I 11 = -j tan(2θ)•V 4 /Z 1 . [Z] a and [Z] b denote the impedance matrices of the 3λ g /4 and λ g /4 parallel-coupled lines, respectively.…”

mentioning

confidence: 99%

Super High-Selectivity Fifth-Order Bandpass Filter with Twelve Transmission Zeros

Xu¹,

Zhang²,

Li³

et al. 2018

RADIOENGINEERING

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A fifth-order bandpass filter (BPF) with super high selectivity using three pairs of coupled lines and two open stubs is proposed. Twelve transmission zeros (TZs) from 0 to 2f 0 (f 0 denotes center frequency of the passband) and five transmission poles (TPs) in the passband can be obtained to realize good out-of-band suppression and sharp roll-off skirts. For demonstration, a simple BPF prototype centered at 2.04 GHz is designed, fabricated with measured 3-dB fractional bandwidth of 18% and very high transition band roll-off rates of over 567 dB/GHz. Good agreement between the simulations and measurements validates the design method.

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Broadband Filtering Power Dividers Using Simple Three-Line Coupled Structures

Cited by 52 publications

References 20 publications

Compact bandstop filters using coupled lines and open/short stubs with multiple transmission poles

Compact bandstop filters using coupled lines and open/short stubs with multiple transmission poles

Wilkinson filtering power divider using coupled lines and T‐shaped stub

Super High-Selectivity Fifth-Order Bandpass Filter with Twelve Transmission Zeros

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