Design of a Microstrip Diplexer and Triplexer Using Open Loop Resonators

Chinig, Abdessamed; Errkik, Ahmed; Abdellaoui, Larbi El; Tajmouati, Abdelali; Zbitou, Jamal; Latrach, Mohamed

doi:10.1590/2179-10742016v15i2602

Cited by 31 publications

(38 citation statements)

References 14 publications

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“…In Figure B, the admittances are shown by Y i for i = 1, 2, 3, 4, 5, and 6. For expressing the coupling of input/output, the external quality factor Q e can be defined by the following equation:

Q_{e} = \frac{2 Q_{o} Q_{L}}{Q_{o} - Q_{L}} for : true{\begin{matrix} left \\ Q_{L} = \frac{f_{o}}{{false(Δ f false)}_{3 dB}} \\ Q_{o} = \frac{\frac{f_{o}}{{false(Δ f false)}_{3 dB}}}{(1 - 10^{\frac{- IL}{20}})} \end{matrix} \Rightarrow Q_{e} = \frac{2 f_{o}}{{false(Δ f false)}_{3 dB} 10^{\frac{- IL}{20}}}

where Q L is the loaded quality factor, Q o is the unloaded quality factor, f o is a resonance frequency per GHz, IL is the insertion loss per dB, and (Δ f ) 3dB is the −3 dB bandwidth. From Equation , it can be seen that the external quality factor is depended on the fractional bandwidth and insertion losses of each passbands.…”

Section: Theory and Designing Methodsmentioning

confidence: 99%

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Design of a novel compact microstrip diplexer with low insertion loss

Rezaei

Noori

Mohammadi

2017

Micro & Optical Tech Letters

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In this article, a microstrip diplexer is implemented based on a novel combination of the coupled lines and spiral structures in order to reduce the circuit size as well as insertion losses. This diplexer with an elliptic function frequency response operates at 2.4/2.79 GHz for wireless applications. Several transmission zeros on the both sides of two passbands are realized, which improve the selectivity. A theory method is presented that helps to miniaturization, control the resonance frequency, improve the insertion loss, and external quality factor simultaneously. The proposed diplexer has a compact size of 0.3λg × 0.25λg with low insertion losses of 0.18/0.39 dB at 2.4/2.79 GHz. The isolation between the two channels (S23) is better than 20.5 dB from DC up to 6 GHz. The designed diplexer is fabricated and measured. There is a good agreement between the simulated and measured results.

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Q_{e} = \frac{2 Q_{o} Q_{L}}{Q_{o} - Q_{L}} for : true{\begin{matrix} left \\ Q_{L} = \frac{f_{o}}{{false(Δ f false)}_{3 dB}} \\ Q_{o} = \frac{\frac{f_{o}}{{false(Δ f false)}_{3 dB}}}{(1 - 10^{\frac{- IL}{20}})} \end{matrix} \Rightarrow Q_{e} = \frac{2 f_{o}}{{false(Δ f false)}_{3 dB} 10^{\frac{- IL}{20}}}

Section: Theory and Designing Methodsmentioning

confidence: 99%

“…In Figure 1B, the admittances are shown by Y i for i 5 1, 2, 3, 4, 5, and 6. For expressing the coupling of input/output, the external quality factor Q e can be defined by the following equation 9,10 :…”

Section: T H E O R Y a N D D E S I G N I N G M E T H O Dmentioning

confidence: 99%

Design of a novel compact microstrip diplexer with low insertion loss

Rezaei

Noori

Mohammadi

2017

Micro & Optical Tech Letters

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“…Recently, compact and high-performance microstrip triplexers are highly attractive for multichannel wireless and mobile systems. Accordingly, several types of microstrip triplexers have been reported in [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Their designs are based on various types of microstrip resonators.…”

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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“…Despite its large return loss and weak frequency selectivity, a significant reduction in the insertion losses could be seen. Although the low insertion loss at resonance frequency is an important issue, most of the reported triplexers could not reduce it [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. These triplexers have been designed using various microstrip structures.…”

Section: Introductionmentioning

confidence: 99%

Novel low-loss microstrip triplexer using coupled lines and step impedance cells for 4G and WiMAX applications

Rezaei¹,

Noori²

2018

Turk J Elec Eng & Comp Sci

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Abstract:In this paper, a new microstrip triplexer with flexible resonance frequencies is designed based on the properties of coupled lines, steps, and spiral cells. It operates at 2.67 GHz for 4G LTE and at 3.1 GHz and 3.43 GHz for IEEE 802.16 WiMAX. The close resonance frequencies make it suitable for frequency division duplex applications. In order to improve insertion loss, the LC equivalent circuit of the proposed resonator is analyzed. Moreover, careful alignment of the coupled lines and step impedance structures is performed to improve the insertion and return losses so that they are 0.72/0.63/0.81 dB and 24.5/24/24.7 dB, respectively. The frequency response shows good selectivity for each channel.Meanwhile, there are several transmission zeros above the first channel and below the last one that improve the stopband properties. The proposed triplexer is fabricated and measured. The simulation and measurement results are in good agreement, which validates the introduced methodology.

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Design of a Microstrip Diplexer and Triplexer Using Open Loop Resonators

Cited by 31 publications

References 14 publications

Design of a novel compact microstrip diplexer with low insertion loss

Design of a novel compact microstrip diplexer with low insertion loss

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

Novel low-loss microstrip triplexer using coupled lines and step impedance cells for 4G and WiMAX applications

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