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Multifunctional microstrip transmission lines integrated with defected ground structure for RF front-end application

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6 Author(s)
Younkyu Chung ; Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA ; Seong-Sik Jeon ; Shinho Kim ; D. Ahn
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This paper presents multifunctional microstrip transmission lines for designing a high port-isolation dual-frequency orthogonally polarized rectangular patch antenna and the antenna-integrated power amplifier. The proposed lines were realized through the integration of defected ground structures (DGSs) with conventional microstrip lines. A spiral-shaped DGS-integrated microstrip line enhances the port isolation of the antenna, while feeding the 2.0-GHz excitation to the antenna and filtering out the 2.5-GHz receiving signal from the other port. High-order harmonic signal suppression of the power amplifier at the 2.5-GHz port was accomplished by the dumbbell-shaped DGS, thereby improving the efficiency of the amplifier. Measurements show an improvement of 20 dB in port isolation and 3% in power-added efficiency relative to an identical RF front-end, but integrated with a conventional patch antenna. An image impedance of the DGS-integrated microstrip lines can be controlled by the integrated DGS geometries. Relatively high-impedances lines, i.e., 150 and 100 Ω, are effectively implemented using microstrip lines with 75- and 50-Ω linewidths by incorporating the spiral- and dumbbell-shaped DGSs, respectively.

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IEEE Transactions on Microwave Theory and Techniques  (Volume:52 ,  Issue: 5 )