A 3-dB quadrature coupler using broadside-coupled coplanar waveguides

Chieh Pin Chang, Jui Chieh Chiu, Hua Yueh Chiu, Yeong Her Wang

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


A 3-dB quadrature coupler which combines the advantages of broadside-coupling and coplanar waveguide structure suitable for a single-layer printed circuit board (PCB) circuit design is proposed. Compared to the recently published broadsidecoupled structures, the proposed coupler can easily be realized in a single-layer substrate by using PCB manufacturing processes to eliminate the effects of uncertain factors from a multi-layer substrate. With the operation bandwidth ranging from 2.1 to 2.7 GHz, the measured return loss and isolation are all better than 19 dB, and the insertion losses and relative phase difference between the direct and coupled ports are at 3.2±0.1 dB and 90±0.6°, respectively. The dimension of the coupler is 2.1 cm × 1.9 cm.

Original languageEnglish
Article number4459073
Pages (from-to)191-193
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number3
Publication statusPublished - 2008 Mar

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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