Abstract
A new type of hybrid resonant circuit model is investigated theoretically and experimentally. The resonant model consists of a right hand (RH) patch part and a composite right and left handed (CRLH) part (RH + CRLH), which determines a compact size and also a convenient frequency modulation characteristic for the proposed antennas. For experimental demonstration, two antennas are fabricated. The former dual-band antenna operating at f-1=3.5 GHz (Wimax) and f+1=5.25 GHz (WLAN) occupies an area of 0.21λ0×0.08λ0, and two dipolar radiation patterns are obtained with comparable gains of about 6.1 and 6.2 dB, respectively. The latter antenna advances in many aspects such as an ultrasmall size of only 0.16λ0×0.08λ0, versatile radiation patterns with a monopolar pattern at f0=2.4 GHz (Bluetooth), and a dipole one at f+1=3.5 GHz (Wimax) and also comparable antenna gains. Circuit parameters are extracted and researched. Excellent performances of the antennas based on hybrid resonators predict promising applications in multifunction wireless communication systems.
Highlights
Over the past decade, artificial electromagnetic (EM) metamaterials (MTMs) have intrigued long-hold interests due to their abundant abnormal behaviors that are not occurring in nature
Resonant antennas by loading MTMs are interesting for researchers for their compact size and multibands characteristic, among which two categories are most important
Resonant antennas using composite right and left handed (CRLH) transmission line (TL) are in advantage of compact structure, while they suffer from an easy method of frequency modulation [8, 9]
Summary
Artificial electromagnetic (EM) metamaterials (MTMs) have intrigued long-hold interests due to their abundant abnormal behaviors that are not occurring in nature. Hybrid resonant multifrequency antennas with a symmetrical structure of right handed patch, CRLH part, and right handed patch (RH + CRLH + RH) are capable of frequency modulation [10,11,12,13,14,15,16], while they are not sufficient in miniaturization. To solve the above issues, in this paper, a new kind of CRLH TLs has been proposed by loading complementary spiral resonators (CSRs) in the conventional mushroom structure. 2. CRLH Cell Design and the Working Mechanism of Novel Asymmetrical Hybrid Resonator. Size reduction is available for a missing of RH patch and frequency modulation characteristic does not deteriorate with a combination of RH part and CRLH section
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
