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Balanced Amplifier using Three-Arm Branch $90^{\circ}$ Hybrid Coupler  

Kim, Seon-Sook (School of Electronic Engineering Soong-sil Univ.)
Seo, Chul-Hun (School of Electronic Engineering Soong-sil Univ.)
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Abstract
In this paper, broadband balanced amplifier has been realized with Three-Arm Branch $90^{\circ}$ Hybrid Coupler at center frequency 2GHz. $90^{\circ}$ Hybrid Branch-Line Coupler has been compared with Three-Arm Branch $90^{\circ}$ Hybrid Coupler. The bandwidth VSWR and gain or proposed amplifier have been 480MHz, 1.06 and 15.47dB, respectively.
Keywords
balanced amplifier; coupler; bandwidth; VSWR; gain;
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