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Planar microstrip coupler with enhanced power coupling

Planar microstrip coupler with enhanced power coupling

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The design of a planar microstrip coupler where power coupling between two parallel microstrip lines can easily be controlled is presented. Enhancement of power coupling is done via two small slots in the ground plane underneath the microstrip pair. The ground plane slots force the field lines near the edge of each microstrip to cross to the adjacent microstrip. The magnitude of the power coupling can easily be controlled by adjusting the length of the slots. Here, the operation of a microstrip coupler is described, and the design of a 1 × 4 power distributor array that can be used to distribute the input microwave power uniformly to four branch lines arranged in a row is presented. The measured responses of the array are also presented, and shown that the performance agree very well with simulated results.

References

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      • 3. Gupta, K., Garg, R., Bahl, I., Bhartia, P.: ‘Microstrip lines and slotlines’ (Arthech House, 1996).
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      • 4. Pozar, D.M.: ‘Microwave engineering’ (John Wiley & Sons, 2009).
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      • 5. Leech, J., Yassin, G., Tan, B.-K., Zhou, Y.J., Grimes, P.: ‘An SIS mixer based focal-plane array at 230 GHz’. Twenty-Six Int. Symp. on Space Terahertz Technology, Cambridge, MA, USA, March 2015.
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