TY - JOUR
T1 - A 3-dB quadrature coupler suitable for PCB circuit design
AU - Chiu, Jui Chieh
AU - Lin, Chih Ming
AU - Wang, Yeong Her
N1 - Funding Information:
Manuscript received February 24, 2006; revised May 16, 2006. This work was supported in part by the National Science Council under Contract NSC94-2215-E-006-001, by the Ministry of Education Program for Promoting Academic Excellence of Universities under Grant A-91E-FA08-1-4, and by the Foundation of Chen under the Jieh-Chen Scholarship.
PY - 2006/9
Y1 - 2006/9
N2 - 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.
AB - 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.
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U2 - 10.1109/TMTT.2006.879772
DO - 10.1109/TMTT.2006.879772
M3 - Article
AN - SCOPUS:33748347938
VL - 54
SP - 3521
EP - 3525
JO - IRE Transactions on Microwave Theory and Techniques
JF - IRE Transactions on Microwave Theory and Techniques
SN - 0018-9480
IS - 9
M1 - 1684147
ER -