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

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

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


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 - 15 dB; the insertion loss of coupled and direct ports is about 3 ± 0.2 dB and the relative phase difference of 89 ± 0.3°. The dimension of the coupler is 3.1 cm × 1.8 cm.

Original languageEnglish
Article number1637498
Pages (from-to)369-371
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number6
Publication statusPublished - 2006 Jun 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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