A Miniaturized Diplexer Using Planar Artificial Transmission Lines for GSM/DCS Applications

Li, Kuen-Hua; Wang, Chaowei; Yang, Chang‐Fa

doi:10.1109/apmc.2007.4555114

Cited by 15 publications

(12 citation statements)

References 8 publications

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“…Planar diplexers are important component in modern wireless communication systems . The conventional approach to realize a diplexer is to use two filters that are combined with a three‐port impedance matching network . Other techniques, such as the common resonator technology, balun diplexer, and others are proposed.…”

Section: Introductionmentioning

confidence: 99%

Novel planar diplexer using branch‐line coupler

Sajadinia

Dahmardeh

Khalaj‐Amirhosseini

2018

Micro & Optical Tech Letters

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This article introduces a simple and effective design of a planar diplexer with high isolation and flexible frequency selection. The diplexer is composed of two branch‐line couplers and two identical filters. The two couplers are used to split the input signal and also combining the signals in each channel. This leads to signal addition by the couplers and provides very low losses for the diplexer. The wideband matching property of the coupler makes it suitable for both narrow band and broadband applications. A simple, yet effective method is introduced to design each channel separately over wide range of frequencies. The simulated and measured results show satisfactory agreement and indicate low insertion loss (0.9‐1.16 dB) and high isolation (up to 62 dB). The results indicate that the proposed design method may be a promising path to realize diplexers for multi‐frequency communications over a wide frequency range.

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Section: Introductionmentioning

confidence: 99%

Novel planar diplexer using branch‐line coupler

Sajadinia

Dahmardeh

Khalaj‐Amirhosseini

2018

Micro & Optical Tech Letters

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“…In past, many design methods for planar diplexer have been proposed. The most well‐known methods to compact the planar diplexer is using resonators such as double‐loop‐coupled and slow‐wave open‐loop resonators , modified stepped‐impedance resonator , spiral resonator , periodic‐stub resonator , square open loop with stepped‐impedance resonator , stepped impedance coupled‐line resonator , H‐type resonator , and artificial transmission line , microstrip line resonators with loaded elements , have been utilized in diplexer design. In , microstrip diplexer based on conventional complementary split ring and pseudo‐interdigital resonators are also designed to reduce the size of diplexer, but the size is still large.…”

Section: Introductionmentioning

confidence: 99%

Compact wide‐stopband planar diplexer based on rectangular dual spiral resonator

Bukuru

Song

Xue

2014

Micro & Optical Tech Letters

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A Compact wide‐stopband planar diplexer based on rectangular dual spiral resonator (RDSR) is proposed. The proposed diplexer is composed of three parts: (1) two RDSR bandpass filters (BPFs) with right bend open‐circuited stubs coupling feed structure, (2) open‐circuited stub to reduce the second harmonic in upper stopband, and (3) T‐junction configuration to combine two BPFs circuits for one planar diplexer. Based on the structure, the fabricated wide‐stopband planar diplexer prototype with compact dimension is achieved to operate at the WLAN frequencies (i.e., 3.65/5.2 GHz). Both the simulated and measured results indicate that satisfactory impedance matching and high isolation between two channels are achieved. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:174–178, 2015

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“…In microstrip diplexer design, some harmonics probably appear near or inside the two passbands, which will degenerate the performance of the diplexer [2,5,7,10,11,13]. Therefore, if the unloaded quality factor of these harmonics can be greatly reduced, then these harmonics can be suppressed very well.…”

Section: Introductionmentioning

confidence: 99%

“…Besides the size reduction, high performance for microstrip diplexer is also important. In [2][3][4][5][6][7][8][9][10], each diplexer still has one or two drawbacks of the performance of the diplexers, such as selectivity, isolation, harmonic suppression, and frequency-ratio range of the two passbands.…”

Section: Introductionmentioning

confidence: 99%

“…To compact the microstrip diplexer, resonators such as steppedimpedance open-loop resonators [2], miniaturized open-loop resonator [3], square open loop with stepped-impedance resonator [4], stepped impedance coupled-line resonator [5], H-type resonator [6] and artificial transmission line [7], have been utilized in diplexer design. In [8,9], microstrip diplexer based on dual-passband filter is also designed to reduce the size of the diplexer, however the large size of the matching networks limit the effect of size reduction.…”

Section: Introductionmentioning

confidence: 99%

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Diplexers Based on Microstrip Line Resonators With Loaded Elements

Shi¹,

Chen²,

Bao³

2011

PIER

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Abstract-In this paper, microstrip line resonators with loaded elements are proposed and studied to design microstrip diplexer. To demonstrate the design ideas, the equivalent circuits of the proposed resonators are built and studied. It is found that the different loads on different positions of the proposed half-wavelength resonator make the resonator have different features, which will easily control the characteristic of the diplexers. And here, resistor, open stub, and shorted stub are used as loaded elements. It is found the resistor loaded on the center of the microstrip line resonator can extremely reduce the unloaded quality factor of even-mode resonant frequency, which can be used to suppress the harmonics of the diplexer. The loaded open stub not only can reduce the size of the diplexer, but also can control the frequency ratio between the fundamental frequency and second harmonic of a resonator, which can increases the frequency ratio between the two passbands of the diplexer. As for the loaded shorted stub, it can enlarge the size of the diplexer. To demonstrate the design ideas, three diplexers are presented. The comparisons between the loaded and unloaded diplexers are given. The experimental results agree well to the theoretical predictions and simulations.

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A Miniaturized Diplexer Using Planar Artificial Transmission Lines for GSM/DCS Applications

Cited by 15 publications

References 8 publications

Novel planar diplexer using branch‐line coupler

Novel planar diplexer using branch‐line coupler

Compact wide‐stopband planar diplexer based on rectangular dual spiral resonator

Diplexers Based on Microstrip Line Resonators With Loaded Elements

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