A 3-dB quadrature coupler suitable for PCB circuit design

Jui Chieh Chiu, Chih Ming Lin, Yeong Her Wang

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


A quadrature 3-dB coupler, which combines the advantages of a coplanar waveguide and microstrip line structure suitable for single-layer substrate printed circuit board (PCB) circuit design is proposed. As compared to the conventional Lange coupler, the proposed coupler with the advantages of increasing the coupled linewidths and coupling spacing without using extra bonding wires can solve the drawbacks of Lange coupler. In addition, the proposed structure can easily be realized in a single-layer substrate by PCB manufacturing processes to eliminate the effects and uncertain factors from a multilayer substrate. Good agreements between the simulation and measurement in the frequency range from 0.45 to 5 GHz can be seen. With the operation bandwidth ranging from 1.8 to 2.8 GHz, the measured results of the return loss are better than 18.2 dB and insertion losses of coupled and direct ports are approximately 3±0.1 dB; the relative phase difference is approximately 89.8°. The dimension of the circuit is 2.7 cm × 1.6 cm × 0.08 cm.

Original languageEnglish
Article number1684147
Pages (from-to)3521-3525
Number of pages5
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number9
Publication statusPublished - 2006 Sept

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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