文章基本信息

标题：Design of Tunable Monopole Arm Planar Spiral Antenna for Cognitive Radio
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作者：Rahul Yadav
期刊名称：Advances in Electrical Engineering
印刷版ISSN：2356-6655
出版年度：2014
卷号：2014
DOI：10.1155/2014/593194
出版社：Hindawi Publishing Corporation
摘要：This paper presents a spiral antenna design operating in the frequency range of 1–15 GHz having both selective notch bands and wideband response. The main feed arm of spiral antenna is configured as rectangular monopole of width quarter wavelength to achieve impedance matching with standard 50 Ω excitation. Frequency tuning in the design is achieved by placing varactor diode at an appropriate position along the spiral arms and in the ground plane. The design offers a peak gain of 3.4 dB (simulated) and 3 dB (measured). The unique frequency response of antenna makes its suitable to be used for front-end system of cognitive radio for sensing the spectrum in various modes.