A directivity enhancement for directional couplers using additional coupled lines

Hideharu Yoshioka; Akimichi Hirota; Hidenori Ishibashi; Naofumi Yoneda; Moriyasu Miyazaki

doi:10.1587/elex.13.20160317

A directivity enhancement for directional couplers using additional coupled lines

Hideharu Yoshioka, Akimichi Hirota, Hidenori Ishibashi, Naofumi Yoneda, Moriyasu Miyazaki

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

A novel method for enhancing the directivity of coupled-line directional couplers is presented. In a coupled-line directional coupler formed on thin multi-layered substrates, it is difficult to match the coupled-line characteristic impedance with the load impedance. This impedance mismatch causes forward coupling in the directional coupler, thus degrading the directivity. This method utilizes reverse-phase forward coupling with an additional coupled line to cancel the undesired forward coupling due to the primary coupled line. It has been experimentally verified that the directivity of the proposed 20-dB coupler is increased by 13 dB at 840 MHz in comparison with the conventional coupler.

Original language	English
Article number	20160317
Journal	ieice electronics express
Volume	13
Issue number	18
DOIs	https://doi.org/10.1587/elex.13.20160317
Publication status	Published - 2016
Externally published	Yes

Keywords

Directional couplers
Directivity
Forward couplings
Multi-layered substrates

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1587/elex.13.20160317

Cite this

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title = "A directivity enhancement for directional couplers using additional coupled lines",

abstract = "A novel method for enhancing the directivity of coupled-line directional couplers is presented. In a coupled-line directional coupler formed on thin multi-layered substrates, it is difficult to match the coupled-line characteristic impedance with the load impedance. This impedance mismatch causes forward coupling in the directional coupler, thus degrading the directivity. This method utilizes reverse-phase forward coupling with an additional coupled line to cancel the undesired forward coupling due to the primary coupled line. It has been experimentally verified that the directivity of the proposed 20-dB coupler is increased by 13 dB at 840 MHz in comparison with the conventional coupler.",

keywords = "Directional couplers, Directivity, Forward couplings, Multi-layered substrates",

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T1 - A directivity enhancement for directional couplers using additional coupled lines

AU - Yoshioka, Hideharu

AU - Hirota, Akimichi

AU - Ishibashi, Hidenori

AU - Yoneda, Naofumi

AU - Miyazaki, Moriyasu

N1 - Publisher Copyright: © IEICE 2016.

PY - 2016

Y1 - 2016

N2 - A novel method for enhancing the directivity of coupled-line directional couplers is presented. In a coupled-line directional coupler formed on thin multi-layered substrates, it is difficult to match the coupled-line characteristic impedance with the load impedance. This impedance mismatch causes forward coupling in the directional coupler, thus degrading the directivity. This method utilizes reverse-phase forward coupling with an additional coupled line to cancel the undesired forward coupling due to the primary coupled line. It has been experimentally verified that the directivity of the proposed 20-dB coupler is increased by 13 dB at 840 MHz in comparison with the conventional coupler.

AB - A novel method for enhancing the directivity of coupled-line directional couplers is presented. In a coupled-line directional coupler formed on thin multi-layered substrates, it is difficult to match the coupled-line characteristic impedance with the load impedance. This impedance mismatch causes forward coupling in the directional coupler, thus degrading the directivity. This method utilizes reverse-phase forward coupling with an additional coupled line to cancel the undesired forward coupling due to the primary coupled line. It has been experimentally verified that the directivity of the proposed 20-dB coupler is increased by 13 dB at 840 MHz in comparison with the conventional coupler.

KW - Directional couplers

KW - Directivity

KW - Forward couplings

KW - Multi-layered substrates

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A directivity enhancement for directional couplers using additional coupled lines

Abstract

Keywords

ASJC Scopus subject areas

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