A compact diplexer using square open loop with stepped impedance resonators

Konpang, Jessada

doi:10.1109/rws.2009.4957292

Cited by 18 publications

(15 citation statements)

References 6 publications

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“…e microstrip open-loop resonator filters are highly desirable in the wireless communication systems with compactness and high performance [2]. Many research studies have been performed on compact resonator filters and diplexers such as stepped impedance open-loop resonators [3], compact open-loop resonator filter structure [4], and microstrip square open-loop with stepped-impedance resonator filter and diplexer [5].…”

Section: Introductionmentioning

confidence: 99%

Four-Port Dual-Mode Diplexer with High Signal Isolation

Konpang

Wattikornsirikul

2020

Active and Passive Electronic Components

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An ease of four-port dual-mode diplexer with high signal isolation is presented. A compact dual-mode diplexer with high signal isolation between the Rx and Tx modules is achievable by only using one resonator filter topology. Two back-to-back dual-mode diplexers have a 180° phase shift in one branch. The high isolation can be achieved by amplitude and phase cancellation technique. The delayed transmission line can be easily achieved by the phase shifter. The simulated and measured four-port dual-mode diplexers are designed at the centre frequency of Rx/Tx at 1.95 GHz and 2.14 GHz, respectively. The measured results of Rx/Tx dual-mode diplexer devices are presented with 47.1 dB Rx/Tx isolation. This four-port dual-mode diplexer achieves the isolation (S32) of more than 24.1 dB when compared with the conventional three-port dual-mode diplexer structure.

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Section: Introductionmentioning

confidence: 99%

Four-Port Dual-Mode Diplexer with High Signal Isolation

Konpang

Wattikornsirikul

2020

Active and Passive Electronic Components

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“…The square open-loop microstrip resonators filters are highly desirable in wireless communication systems with compactness and high performance [2]. A lot of efforts have been made on compact resonator filters and diplexers such as stepped impedance open-loop resonators [3], miniaturized open-loop resonator [4], and square open loop with stepped-impedance resonator [5].…”

Section: Introductionmentioning

confidence: 99%

Dual-Mode Diplexer With High Isolation Based on Amplitude and Phase Cancellation Technique

Wattikornsirikul¹,

Kumngern²

2018

PIER M

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This paper presents a dual-mode diplexer with easy fabrication and high signal isolation based on amplitude and phase cancellation technique. The dual-mode structure enables a compact and easy asymmetrical frequency response which also requires considerable attenuation between the proximity in frequency of the transmitter and that of the receiver. Two back-to back dual-mode threeport diplexers and a 180 • phase shifter are easily employed to construct the proposed device, which are combined to form a four-port dual-mode diplexer. A 180 • phase shift in one branch can be achieved by delayed transmission line. The simulated and measured four-port dual-mode diplexers are designed at the operational frequency of Tx/Rx at 1.95 GHz and 2.14 GHz, respectively. The measured results of Tx/Rx dual-mode diplexer devices are presented of 48.5 dB Tx/Rx isolation. This four-port dualmode diplexer achieves the isolation (S 32) more than 21.5 dB compared with a conventional three-port dual-mode diplexer.

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“…The T-junction may be the most popularly used combining circuit. The length and width of its two branches must be chosen carefully [16], [5], allowing each filter to match the antenna and introduce an open circuit at the middle band of the other. T-junctions with open stubs [17] or a step impedance transformer [18] have been developed to improve the performance..…”

Section: Introductionmentioning

confidence: 99%

Design of RF Diplexer for Mobile Communication

Brinda¹,

Parveen²

2014

IJCA

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In this paper, a matching circuit for RF diplexer for mobile communication is proposed. Most wanted bands in wireless technologies like GSM and DCS is used. Both bands are designed by using stepped impedance resonators with single order and matching between this two are implemented by Yjunction method. Cutoff frequency for GSM and DCS band are 925 MHz and 1795 MHz. Microstrip Technology is proposed because it provides a better insertion loss, better return loss and good isolation between the passbands. The isolation between two operating bands is better than -50 dB. The overall insertion loss obtained in diplexer is -0.4 dB. The overall return loss is less than -20 dB.

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A compact diplexer using square open loop with stepped impedance resonators

Cited by 18 publications

References 6 publications

Four-Port Dual-Mode Diplexer with High Signal Isolation

Four-Port Dual-Mode Diplexer with High Signal Isolation

Dual-Mode Diplexer With High Isolation Based on Amplitude and Phase Cancellation Technique

Design of RF Diplexer for Mobile Communication

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