Analysis and Design of a 3 dB Tunable Lumped-Element Directional Coupler
نویسندگان
چکیده
⎯An analysis of a 3 dB lumped-element directional coupler (LEDC) based on arbitrary terminal impedance is described numerically. To solve the conflicted requirement for broad bandwidth and small size in LEDC, a new structure of coupler is introduced, which can significantly improve bandwidth and whose size is only 3 cm×4 cm on the conditions of the frequency domain of 410 MHz to 490 MHz. The measure results are in good agreement with simulations despite the unexpected resistor loss. Index Terms⎯Terminal impedance, bandwidth, lumped-element directional coupler (LEDC), varactor. d oi: 10.3969/j.issn.1674-862X.2010.02.013
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