A directivity enhancement for directional couplers using additional coupled lines

Yoshioka, Hideharu; Hirota, Atsushi; Ishibashi, Hiroyuki; Yoneda, Naofumi; Miyazaki, Moriyasu

doi:10.1587/elex.13.20160317

Cited by 2 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1(b), the impedances Z 0 , Z 1 , and Z 2 can be chosen as 58 Ω, 50 Ω, and 80 Ω. By choosing 5 ¼ 55°, 6 ¼ 125°, 7 ¼ 90°, 8 ¼ 90°, 9 ¼ 180°, the impedances Z 5 , Z 6 , Z 7 , Z 8 and Z 9 can be calculated as Z 5 ¼ Z 6 ¼ 141:6 Ω, Z 7 ¼ Z 8 ¼ 100 Ω, Z 9 ¼ 80 Ω, respectively. After optimization using ANSYS HFSS, the final impedances are Fig.…”

Section: Implemention and Measurementmentioning

confidence: 99%

See 1 more Smart Citation

Miniaturized dual-band coupler using three-branch-line structure and dual transmission lines

Zhan

et al. 2017

IEICE Electron. Express

View full text Add to dashboard Cite

This letter presents a compact dual-band branch-line coupler. Explicit design formulas of the three-branch-line coupler (3-BLC) are derived and useful design curves are given. The equivalent dual transmission lines structure is used to decrease the dimension, and also the partial branch lines are folded to further miniaturize the design. The proposed dual-band (2.45 and 5.8 GHz) coupler has a compact size with 57.6% size reduction compared with the conventional circuit. The measured and simulated results are in good agreement with each other. Keywords: dual-band coupler, compact size, three-branch-line structure, dual transmission lines Classification: Microwave and millimeter-wave devices, circuits, and modules References[1] C. Collado, et al.: "Dual-band planar quadrature hybrid with enhanced bandwidth response," IEEE Trans.

show abstract

Section: Implemention and Measurementmentioning

confidence: 99%

“…The Tshaped equivalent circuit proposed in [2], π-shaped proposed in [3], are widely used to design dual-band branch-line couplers. Moreover, some other approaches were reported to design for dual-band operation [4,5,6,7,8]. The 3-BLC proposed in [1] can provide dual-band operation with enhanced bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized dual-band coupler using three-branch-line structure and dual transmission lines

Zhan

et al. 2017

IEICE Electron. Express

View full text Add to dashboard Cite

show abstract

“…Alternatively, one of the other widely proposed compensation methods includes connecting lumped components at the ends or center of the coupled lines [15,16]. The discussion of impedance mismatch via additional coupled line and epsilon negative transmission line are presented in [17,18]. It has been shown that high directivity for directional couplers can also be obtained using multilayer configuration [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Design of Multilayer and Multiline Microstrip Directional Coupler With Closed Form Relations

Eroğlu¹,

Rönnow²

2018

PIER C

View full text Add to dashboard Cite

Abstract-Design, simulation, implementation and measurement results of multiline and multilayer microstrip directional couplers are given with closed form relations.Step-by-step design procedure reflecting the design practice of directional couplers, which requires only information on coupling level, port impedances and operational frequency, is presented. The method based on the synthesis technique applied in the design of conventional two-line microstrip symmetrical directional couplers is adapted to design multilayer directional couplers with the aid of electromagnetic simulators using parametric analysis with curve fitting method. The proposed design method is compared with the measurement results and accuracy is verified. It has been also shown that the directivity of the couplers designed using the multilayer structure is improved significantly. A method such as the one presented in this paper can be used to design multilayer two-line and three-line directional couplers which can be integrated to the front end of an RFID systems to provide the required isolation between transmitter and receiver and prevent signal leakage due to use of conventional circulators.

show abstract

A directivity enhancement for directional couplers using additional coupled lines

Cited by 2 publications

References 7 publications

Miniaturized dual-band coupler using three-branch-line structure and dual transmission lines

Miniaturized dual-band coupler using three-branch-line structure and dual transmission lines

Design of Multilayer and Multiline Microstrip Directional Coupler With Closed Form Relations

Contact Info

Product

Resources

About