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SIMULATION-DRIVEN DESIGN FOR A HYBRID LUMPED AND DISTRIBUTED DUAL-BAND STUB USING INPUT AND OUTPUT SPACE MAPPING

By J. Gong, Y. Wang, and C. Zhang

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Abstract:
In this paper, a dual-band stub (DBS) comprising one lumped kernel circuit unit cell (KCUC) and two distributed uniform transmission lines is presented. An odd-even mode resonant frequency ratio (OEMRFR) is introduced, which can determine all the element values in the DBS circuit model. Its phase and impedance bandwidth properties are extracted based on the image parameter theory. By adjusting the OEMRFR value, the second working bandwidth and structural size can be controlled simultaneously. On the other hand, the input and output space mapping (IOSM) is exploited to realize a planar microstrip DBS by transferring the lumped KCUC into a quasi-lumped formation. The established ISOM design process is fully automated and can generate the finalized DBS layout with just a few full-wave simulations. A DBS operative at WLAN dual frequencies of 2.4/5.8 GHz with extended bandwidth is designed as an example. Good agreement between the measured and simulated results justifies both the extracted dual-band performance of the proposed DBS and its customized IOSM design process.

Citation:
J. Gong, Y. Wang, and C. Zhang, "Simulation-Driven Design for a Hybrid Lumped and Distributed Dual-Band Stub Using Input and Output Space Mapping," Progress In Electromagnetics Research M, Vol. 76, 133-141, 2018.
doi:10.2528/PIERM18101403

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