A Frequency Agile, Ultralow‐Profile, Complementary Split Ring Resonator‐Based Electrically Small Antenna. Issue 10 (26th July 2013)

• Record Type: Journal Article
• Authors: Tang, Ming‐Chun; Ziolkowski, Richard W.
• Is Part Of: Microwave and optical technology letters. Volume 55:Issue 10(2013:Oct.)
• Page Start: 2425
• Page End: 2428
• Publication Date: 2013-07-26
• Subjects: Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.27882
• Languages: English
• ISSNs: 0895-2477

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>The frequency agility of an electrically small, ultralow‐profile, VHF‐UHF antenna, which has evolved from a complementary split ring resonator unit cell design, is studied numerically. Simulation results demonstrate that when a varactor is integrated into the original 300‐MHz passive antenna and its capacitance is varied linearly from 0 to 5.8 pF, a tuning ratio of 2.02:1 and an effective fractional bandwidth of 67.6% (approximately 679.74 times the original value) is achieved while maintaining |S₁₁| &lt; −10dB (VSWR &lt; 2), and a stable dipolar directivity pattern over the entire bandwidth. The overall dimensions of the proposed antenna at the maximum frequency f_max = c/λ_min are 0.03(λ_min)² × 0.0066λ_min. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2425–2428, 2013</p> </abstract>