@article{a6e12d2b91cb4b5a965db8da0e5a6801,
title = "Compact, Frequency-Reconfigurable Filtenna with Sharply Defined Wideband and Continuously Tunable Narrowband States",
abstract = "A compact, frequency-reconfigurable filtenna with sharp out-of-band rejection in both its wideband and continuously tunable narrowband states is presented. It is intended for use in cognitive radio applications. The wideband state is the sensing state and operationally covers 2.35-4.98 GHz. The narrowband states are intended to cover communications within the 3.05-4.39 GHz range, which completely covers the Worldwide Interoperability for Microwave Access (WiMAX) band and the satellite communications C-band. A p-i-n diode is employed to switch between these wide and narrowband operational states. Two varactor diodes are used to shift the operational frequencies continuously among the narrowband states. The filtenna consists of a funnel-shaped monopole augmented with a reconfigurable filter; it has a compact electrical size: 0.235λLL × 0.392λL , where the wavelength λL corresponds to the lower bound of its operational frequencies. The measured reflection coefficients, radiation patterns, and realized gains for both operational states are in good agreement with their simulated values.",
keywords = "Cognitive radio, filtenna, frequency reconfigurable, monopole antenna, reconfigurable antennas, reconfigurable filters",
author = "Tang, {Ming Chun} and Zheng Wen and Hao Wang and Mei Li and Ziolkowski, {Richard W.}",
note = "Funding Information: Manuscript received April 24, 2017; revised June 23, 2017; accepted July 25, 2017. Date of publication August 7, 2017; date of current version October 5, 2017. This work was supported in part by the National Natural Science Foundation of China Contract 61471072, in part by Graduate Scientific Research and Innovation Foundation of Chongqing, China Contract CYS16020, in part by the Fundamental Research Funds for the Central Universities under Contract 106112016CDJZR165508, Contract 106112017CDJZRPY0003, and Contract 106112017CDJXY160001, in part by China Postdoctoral Science Foundation Contract 2016M590860, in part by the Funding of the Young Backbone Teachers in Colleges and Universities of Chongqing Contract 0307001104102, and in part by the Australian Research Council under Grant DP160102219. (Corresponding author: Ming-Chun Tang.) M.-C. Tang, Z. Wen, H. Wang, and M. Li are with the Key Laboratory of Dependable Service Computing in Cyber Physical Society Ministry of Education, College of Communication Engineering, Chongqing University, Chongqing 400044, China, and also with the Chongqing Engineering Laboratory of High Performance Integrated Circuits, College of Communication Engineering, Chongqing University, Chongqing 400044, China (e-mail: tangmingchun@cqu.edu.cn). Publisher Copyright: {\textcopyright} 1963-2012 IEEE.",
year = "2017",
month = oct,
doi = "10.1109/TAP.2017.2736535",
language = "English (US)",
volume = "65",
pages = "5026--5034",
journal = "IEEE Transactions on Antennas and Propagation",
issn = "0018-926X",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "10",
}