A PCB-compatible 3-dB coupler using microstrip-to-CPW via-hole transitions

Author

Chiu, Jui-Chieh ; Lin, Jih-Ming ; Houng, Mau-Phon ; Wang, Yeong-Her

Author_Institution

Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan

Volume

16

Issue

6

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

369

Lastpage

371

Abstract

A 3-dB coupler by implementing microstrip-to-coplanar waveguide (CPW) via-hole transitions is proposed. The proposed coupler, with the advantages of wider coupled line widths and spacing without using any bonding wires, can eliminate the uncertain factors of conventional Lange couplers caused by the printed circuit board (PCB) manufacturing processes. The proposed coupler can be easily fabricated on a single-layer PCB substrate instead of using multilayer substrates. Good agreements between the simulation and the measurement in the frequency range from 0.45 to 5 GHz can be achieved. The measured results at the center frequency of 2.4 GHz have the return loss better than -15dB; the insertion loss of coupled and direct ports is about 3± 0.2dB and the relative phase difference of 89±0.3°. The dimension of the coupler is 3.1cm × 1.8cm.

Keywords

UHF couplers; coplanar waveguides; directional couplers; microstrip transitions; printed circuits; 0.45 to 5 GHz; PCB-compatible 3-dB coupler; UHF; insertion loss; microstrip lines; microstrip-to-CPW via-hole transitions; microstrip-to-coplanar waveguide transitions; printed circuit board; return loss; Bonding; Coplanar waveguides; Coupling circuits; Frequency measurement; Manufacturing processes; Microstrip; Nonhomogeneous media; Printed circuits; Waveguide transitions; Wires; Coplanar waveguide (CPW); coupler; microstrip line;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2006.875592

Filename

1637498