Balanced quad‐band diplexer with wide common‐mode suppression and high differential‐mode isolation

Lee, Ching-Her; Hsu, Che Ju; Wu, Shang Xing; Wen, Pi Hung

doi:10.1049/iet-map.2015.0538

Cited by 26 publications

(16 citation statements)

References 16 publications

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“…For increased signal immunity to environmental noise, electromagnetic interference and crosstalk in wireless communication systems, most passive circuits such as bandpass filters (BPFs) [1,2], diplexers [3,4], couplers [5,6] and power dividers (PDs) [7][8][9][10][11][12][13][14][15][16] are designed with balanced input/output ports. In some balanced radio frequency communication systems, the trans-receiver modules usually require some of these components to be cascaded together-for example, the balanced BPF and PD function in the feeding networks of differential antenna arrays and the signal transmission blocks between antennas and low-noise amplifiers [10].…”

Section: Introductionmentioning

confidence: 99%

Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality

Wang

Zhang

et al. 2021

IET Microwaves Antenna & Prop

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A microstrip balanced-to-balanced filtering power divider (FPD) design with impedance transformation via a coupled three-line balun structure is proposed. The even/odd mode-analysis method is used to construct a three-port balun bandpass filter (BPF) with stub-loaded resonators and a three-line output structure after analysis and design to prescribe the filtering response of a proposed balanced-to-balanced FPD. To realize good isolation between the differential output ports, a complex impedance-isolation network is loaded by means of coupled lines in the input-feeding section. Theoretical formulas characterized by the coupling factors are provided with a specified source and load impedance ratio under the condition of perfect impedance matching at the centre frequency. According to the calculated S-parameters, design rules are summarized to determine the overall circuit size according to desired bandwidth and return loss. For validation, two balanced-to-balanced FPDs centred at 2.4 GHz with 50-to-50 Ω matching and 50-to-100 Ω transformation are designed, fabricated and tested. Good agreement between the simulated and tested results of the designed balanced-to-balanced impedance-transforming FPDs indicates not only high common-mode rejection but also good port-to-port isolation and good matching at all ports. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Introductionmentioning

confidence: 99%

Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality

Wang

Zhang

et al. 2021

IET Microwaves Antenna & Prop

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“…have been done in their conception. Some examples to be highlighted are those in [9]- [14], which mostly consist of designs with largely-frequency-spaced channels so that isolation is not critical. In [15] and [16], balanced single-and dual-band diplexers with frequency-contiguous channels were presented, respectively.…”

Section: Introductionmentioning

confidence: 99%

Balanced Quasi-Elliptic-Type Combline Diplexer With Multiextracted-Pole Junction/Output Sections

Gómez‐García

Yang

Muñoz‐Ferreras

2020

IEEE Microw. Wireless Compon. Lett.

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A class of coupled-multi-line quasi-elliptic-type balanced diplexer device with closely-spaced channels and its balanced coupling-routing-diagram formalism to simultaneously model its differential-and common-mode operation are reported. It employs third-order combline-type bandpass filters (BPFs) in its filtering channels, whose resonating lines are connected at one of their extremes to the symmetry plane of the balanced-circuit structure (i.e., virtual grounds for the differential mode), along with a multi-extracted-pole/coupled-multi-line dual-band BPF junction and single-band BPF output cells. In differential-mode operation, the dual-band BPF junction adds one in-band pole to each diplexer channel and three transmission zeros (TZs) to both channels, whereas the single-band BPF output cells incorporate one in-band pole and two TZs in their corresponding channels. In this manner, increased-selectivity differential-mode BPF transfer functions for the diplexer channels when compared to those of its third-order combline-type BPFs are obtained. Grounded resistors are connected at the symmetry plane of the balanced diplexer for all the resonating lines of the combline-type BPFs, which become detuned with regard to the poles associated to the dualband BPF junction and the single-band BPF output cells under common-mode excitation. This allows for high common-mode suppression levels in wide spectral ranges to be realized for both channels while maintaining the same TZs as in differentialmode operation. For practical-validation purposes, a 1.6/1.8-GHz microstrip prototype is manufactured and tested.

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“…It is essential to note that the design of multi-channel diplexers is more difficult than the multiplexers and dualfrequency diplexers due to their more complex structures [16]. In [17], a quad-channel diplexer with large size and high insertion loss is designed using two dual-band bandpass filters. The diplexers and multiplexers with close frequency ratios are suitable for the frequency division duplex (FDD) applications.…”

Section: Introductionmentioning

confidence: 99%

Design of a novel microstrip four-channel diplexer for multi-channel telecommunication systems

Rezaei

Noori²,

Jamaluddin

2019

Telecommun Syst

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This paper presents a novel microstrip quad-channel diplexer. The introduced diplexer operates at close resonance frequencies of 1.68 GHz, 1.9 GHz, 3.9 GHz and 4.43 GHz for multi-service wireless applications. The frequency responses of S 21 and S 31 are sharp at the edges of all passbands. To improve the stopband properties, several transmission zeros are created. Also, the low insertion losses of 0.68 dB, 0.57 dB, 0.71 dB, and 0.5 dB are obtained at the resonance frequencies. The proposed diplexer has a new structure with a compact size of 0.051 × λ g 2 . To verify the design method and simulation results, the proposed structure is fabricated and measured. There is a good agreement between the simulation and measurement results.

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Balanced quad‐band diplexer with wide common‐mode suppression and high differential‐mode isolation

Cited by 26 publications

References 16 publications

Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality

Design of a compact microstrip balanced‐to‐balanced filtering power divider with real impedance‐transformation functionality

Balanced Quasi-Elliptic-Type Combline Diplexer With Multiextracted-Pole Junction/Output Sections

Design of a novel microstrip four-channel diplexer for multi-channel telecommunication systems

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