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摘要
A novel tri-band 3-dB rat race coupler operating at two arbitrary frequencies and their mean frequency is presented through replacing quarter-wavelength impedance transformers in a conventional rat race coupler by T-shape step impedance transformers, which can be equivalent to quarter-wavelength impedance transformers at the three frequencies. Closed-form design equations are derived. For verification, a microstrip tri-band 3-dB rat race coupler operating at 1.5/3.5/5.5 GHz is fabricated, aimed to cover the 1.5 GHz GPS band, and the 3.5/5.5 GHz WiMAX bands. Simulated and measured results ale in good agreement.
- 出版日期2010-6
- 单位华南理工大学
