Design of four-channel diplexer using distributed coupling technique

Hsu, Ko Wen; Hung, Wei Chung; Tu, Wen‐Hua

doi:10.1002/mop.29516

Cited by 15 publications

(24 citation statements)

References 15 publications

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“…Table shows the comparison of the prototype of the quad‐channel diplexer and other quad‐channel diplexers. When compared with the works presented in , the size of our work was only about 55.6 and 58% of those reported in , respectively. Besides, the operation frequency of the highest channel of the proposed diplexer was higher than that of the diplexers of these previous works; however, similar insertion losses were achieved in the passbands for the proposed structure.…”

Section: Resultscontrasting

confidence: 52%

“…In published articles, the various structures of filters have been adopted to realize the diplexers with the increased attenuation at stop bands and thus enhance the isolation between output channels, or achieve the very close channel spacing . Although, the multichannel diplexer would find certain applications in the future multiband communication systems, they have been reported in very few articles . The design of quad‐channel diplexer cannot merely realize the required channel characteristics of the two channel filters at different outputs, but it also has to be aware of the channel filter might have some impact on the passbands of channel filter at other output.…”

Section: Introductionmentioning

confidence: 99%

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Design of quad-channel diplexer adopting channel filters with impedance transformers

Peng

Cheng

Chiang

2017

Microw. Opt. Technol. Lett.

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A microstrip diplexer that uses different types of resonant structures to exhibit four channels at two different outputs is presented in this paper. A procedure for synthesizing the diplexer with two dual‐band filters having the required passband characteristics is also proposed. To reduce the interference between the filters at different outputs, the original structures of the dual‐band filters are modified by inserting embedded impedance transformers at the inputs of the lumped‐element resonators in the filters. Another component, working as an inductive compensation, is connected to the common input port to achieve the desired quad‐channel characteristics when the filters with embedded impedance transformers cannot eliminate the interference between the channel filters. To verify the proposed design method, an experimental prototype with four channels located in commonly used wireless communication bands is fabricated on a commercial printed circuit board substrate. The diplexer is highly compact; the measured insertion losses of all passbands are <2.8 dB and the associated return losses are >15 dB in the desired passbands. The isolations between the four passbands of the two outputs are all >30 dB. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:883–888, 2017

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Section: Resultscontrasting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Design of quad-channel diplexer adopting channel filters with impedance transformers

Peng

Cheng

Chiang

2017

Microw. Opt. Technol. Lett.

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“…It can be seen that the proposed diplexer possesses the largest channel isolation. In comparison with the diplexers based on second-order BPFs using microstrip SIRs [10,11] and DSIRs or slotline SIRs [15,18], the proposed diplexer utilizing fourth-order BPFs has a larger circuit size as expected.…”

Section: Three-port Quad-channel Diplexer Designmentioning

confidence: 82%

“…Recently, microstrip stepped impedance resonators (SIRs) have drawn widespread attention to develop all kinds of microwave devices such as filters [7][8][9], diplexers [10][11][12], as well as antennas [13], because the fundamental and spurious resonances can be conveniently tuned by adjusting impedance ratio (K = Z 2 /Z 1 ) and electrical length ratio (α = θ 2 /(θ 1 + θ 2 )) at the same time [14] to meet desired specifications. Two compact quad-channel diplexers were proposed in [10] and [11], respectively, with the combination of coupled SIRs and distributed coupling technique, wherein each pair of SIRs was elaborated to perform as a two-pole dual-passband BPF. In [12], sixteen microstrip SIRs were employed to fulfill an eight-channel diplexer with wide stopband, and every two SIRs were used to decide one individual two-pole BPF.…”

Section: Introductionmentioning

confidence: 99%

Compact Quad-Channel Diplexer Using Defected Stepped Impedance Resonators

Zhu¹,

Zhou²,

Chen³

et al. 2018

PIER Letters

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This paper proposes a new compact quad-channel diplexer (2.45/4.2 GHz and 3.5/5.2 GHz) using defected stepped impedance resonators (DSIRs). The proposed quad-channel diplexer is composed of one common input feeding line, sixteen folded DSIRs, and two output feeding lines. Every four DSIRs are designed to determine passband characteristics of one individual channel, and two passbands are filtered out eventually at each output port. The distributed coupling technique featured by small loading effect is introduced to eliminate the necessity of extra impedance matching networks, which consequently results in a reduced circuit size. A diplexer prototype operated at 2.45/4.2 GHz and 3.5/5.2 GHz bands with measured 3-dB fractional bandwidths of 12.5%, 7.2%, 6.4%, and 5.0% has been implemented, showing a high isolation of larger than 33 dB between the two output ports. Experimental results coincide well with the theoretical predictions and simulation results.

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“…Multi-channel microstrip devices such as multiplexers [1,2] and multi-channel diplexers [3,4] are strongly demanded by modern multi-channel communication systems. They have been utilised to select desired signals among crowded frequency bands.…”

Section: Introductionmentioning

confidence: 99%

A Compact Microstrip Triplexer With a Novel Structure Using Patch and Spiral Cells for Wireless Communication Applications

Rezaei¹,

Yahya²,

Moradi³

et al. 2019

PIER Letters

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In this work, a novel planar four-port microstrip triplexer is designed and analyzed to operate at 1.9 GHz, 2.5 GHz, and 3.35 GHz for wireless communication applications. The proposed structure consists of a compact patch and spiral cells. The main advantage of this triplexer is its very compact size, with a cross size of only 15 mm × 15 mm (0.017λ 2 g). Sharp frequency response at the edges of all passbands, low insertion losses (0.25 dB, 0.4 dB and 0.11 dB), and high return losses (45 dB, 54 dB and 40 dB) in all channels are the other advantages of the designed triplexer. Additionally, the triplexer has reasonable isolations (S 23 , S 24 , S 34), better than 20 dB. To verify the design method, both EM simulation and measurement results are obtained. The comparison shows that the measured and simulated results are in good agreement, which proves the feasibility of this work.

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Design of four-channel diplexer using distributed coupling technique

Cited by 15 publications

References 15 publications

Design of quad-channel diplexer adopting channel filters with impedance transformers

Design of quad-channel diplexer adopting channel filters with impedance transformers

Compact Quad-Channel Diplexer Using Defected Stepped Impedance Resonators

A Compact Microstrip Triplexer With a Novel Structure Using Patch and Spiral Cells for Wireless Communication Applications

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