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COMPOSITE DUAL TRANSMISSION LINES AND ITS APPLICATION TO MINIATURIZATION OF GYSEL POWER DIVIDER

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This letter presents novel composite dual-transmission lines. The proposed line consists of one direct series line and two identical transmission lines connected by a series lumped capacitor. The line is… Click to show full abstract

This letter presents novel composite dual-transmission lines. The proposed line consists of one direct series line and two identical transmission lines connected by a series lumped capacitor. The line is analyzed with an even-odd mode analysis method to have simple closed-form design equations. From the design equations, it is also observed that one can maintain a more realizable value of the impedance of the lines and achieve a good amount of miniaturization by adjusting only the lumped capacitor. To verify this technique, a 74.6% miniaturized Gysel power divider (GPD) is designed at 0.95 GHz compared to reference GPD. The physical size of the proposed GPD is 60mm × 32 mm (equivalently 0.25λg × 0.13λg , λg is guided wavelength line). Moreover, two transmission zeros (TZs) are obtained near passband which improve the out-of-band performance.

Keywords: transmission; power divider; gysel power; dual transmission; transmission lines; composite dual

Journal Title: Progress in Electromagnetics Research Letters
Year Published: 2020

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