Slow-Wave Broadside-Coupled Microstrip Lines and Its Application to the Rat-Race Coupler

Author

Wei-Shin Chang ; Cheng-Hsien Liang ; Chi-Yang Chang

Author_Institution

Inst. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

25

Issue

6

fYear

2015

fDate

Jun-15

Firstpage

361

Lastpage

363

Abstract

This letter proposes a type of slow-wave broadside-coupled microstrip lines. The new structure only requires a single-layer substrate and has the independently controllable even- and odd-mode impedances and slow-wave factors by adjusting the corresponding structural parameters. This property greatly simplifies the circuit design. In addition, it provides a large coupling strength. A miniaturized wideband microstrip rat-race coupler with the high isolation and perfect balances is implemented using the proposed slow-wave coupled lines.

Keywords

microstrip couplers; microstrip lines; network synthesis; circuit design; coupling strength; even-mode impedances; miniaturized wideband microstrip rat-race coupler; odd-mode impedances; single-layer substrate; slow-wave broadside-coupled microstrip lines; slow-wave factors; structural parameters; Circuit synthesis; Couplers; Couplings; Microstrip; Microwave circuits; Substrates; Wireless communication; Broadside-coupled microstrip lines; high isolation; rat-race coupler; slow-wave structure;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2015.2421306

Filename

7091946