Design of an extremely miniaturized branch-line coupler
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In this paper, a new size-reduction approach for branch-line coupler is introduced which uses parallel end-shorted coupledlines with lumped capacitors. The characteristic of the new design was analyzed using even-odd mode method, and simulatedon HFSS before fabricated on the FR4 epoxy glass cloth copper-clad plat (CCL) PCB substrate at center frequency of 1GHz. The electrical length of transmission line was reduced to 15 degrees, therefore the size of branch-line coupler was largelyreduced approximately maintaining the same characteristic around the stable center frequency. The insertion loss of thebranch-line coupler filter was –4.39 dB. The size of the overall hybrid is 20 mm × 20 mm. Measurements results were wellagreed with the simulated ones.
Abstract
In this paper, a new size-reduction approach for branch-line coupler is introduced which uses parallel end-shorted coupledlines with lumped capacitors. The characteristic of the new design was analyzed using even-odd mode method, and simulatedon HFSS before fabricated on the FR4 epoxy glass cloth copper-clad plat (CCL) PCB substrate at center frequency of 1GHz. The electrical length of transmission line was reduced to 15 degrees, therefore the size of branch-line coupler was largelyreduced approximately maintaining the same characteristic around the stable center frequency. The insertion loss of thebranch-line coupler filter was –4.39 dB. The size of the overall hybrid is 20 mm × 20 mm. Measurements results were wellagreed with the simulated ones.
참고문헌 (4)
- Y. C. Chiang, "Design of a wide-band lumped-element 3-dB quadrature coupler", IEEE Transactions Microwave Theory Technic, 49(3), pp.476~479 (2001)
- T. Hirota, "Reduced-size branch-line and rat-race hy-brids for uniplanar MMIC’s", IEEE Transactions. Microwave Theory Technic, 38(3), pp.270~275 (1990)
- I. Kang, "A reduced-size power divid-er using the coupled line equivalent to a lumped in-ductor", Journal of Microwave, 46(7), pp.82~88 (2003)
- D. M. Pozar, "Microwave Engineering" (1998), Wiley