Metamaterial‐inspired miniaturized antenna loaded with IDC and meander line inductor using partial ground plane

Abstract

In this article, a novel omnidirectional compact dual band metamaterial‐inspired antenna with CPW feed has been proposed for application of GSM 1800 (1.71‐1.785 GHz/1.805‐1.879 GHz), GSM 1900 (1.85‐1.91 GHz/1.93‐1.99 GHz), UMTS (1.92‐2.17 GHz), WLAN/Wi Fi (4.9, 5, 5.9 GHz), HiperLAN1 (5.15‐5.3 GHz), and HiperLAN2 (5.47‐5.72 GHz) using a combination of meander line inductor and interdigital capacitor (IDC). The antenna consists of complimentary right/left handed (CRLH) transmission line on both sides of patch to excite zeroth order mode (n = 0). The rectangular slotted stubs act as a virtual ground for the structure using a short circuit condition at the end of the IDC. The zeroth order resonance (ZOR) frequency is mainly controlled by IDC and partially with the meander line inductor. The designed antenna operates from 1.72 to 2.22 GHz and 4.25 to 5.88 GHz with radiating size of 0.56λo × 0.35λo (32 × 20 mm2), where λo is the free‐space wavelength at ZOR frequency of 5.27 GHz. The proposed antenna offers measured impedance bandwidth (|S11| <−10 dB) of 25.3 and 18.7% at 1.95 and 5.28 GHz and covers the targeted frequency bands. The proposed structure offers omnidirectional radiation patterns are congruous throughout the working band.

A compact dual‐band zeroth‐order resonator antenna loaded with meander line inductor

“…Although electrical size of suggested antenna is slightly larger than References 15 and 16 according to Table 2, but size reduction can be achieved by reducing the width ( w 1 ) of meander line turns. In addition, peak gain of suggested antenna at ZOR frequency is lower than References 19, 21, and 22 because overall size these antennas are greater than suggested antenna. Also antennas given in References 19 and 21 are planar structure antennas same as suggested but antenna in Reference 22 having complicated structure from fabrication point of view.…”

“…In addition, peak gain of suggested antenna at ZOR frequency is lower than References 19, 21, and 22 because overall size these antennas are greater than suggested antenna. Also antennas given in References 19 and 21 are planar structure antennas same as suggested but antenna in Reference 22 having complicated structure from fabrication point of view.…”

“…However, such type of CRLH‐TL antenna structures suffers from negative gain, reduced radiation efficiency, and higher level of cross‐polarization, 9‐13 for designing suitable antenna for wireless application with some bandwidth enhancement techniques are suggested in References 14‐16. Antenna proposed in Reference 16 has low gain and lesser bandwidth at ZOR frequency, in order to achieve gain enhancement using decoupling structures by keeping a specific distance between MTM unit cells in order of free space wavelength provides the isolation among them which in turn reduced mutual coupling are well investigated in References 17‐19.…”

Effect of Dielectric Substrate Parameters Which Dimensions of Lens and Distance From Antenna on The Gain Enhancement of Microstrip Antenna with Metamaterial

“…In 2014, DadGarpour showed that by placing a metamaterial lens layer in front of an antenna structure called a bow tie antenna, the antenna main beam could be directed in a desired direction and accordingly the antenna performance could be improved (Dadgarpour et al, 2014). In addition to these studies, there are also several antenna studies using MM (Kumar A and Kumar VD, 2013;Rahman et al, 2018;Arayeshnia et al, 2019;Singh HS et al, 2019;Singh M, 2019).…”

A CPW‐fed band notched wideband circularly polarized ZOR antenna based on CRLH‐TL approach

“…Unfortunately, the ZOR has narrowband property and hence is not preferred in many designs. Due to this bandwidth enhancement of the metamaterial antenna is one of the popular research topics . Metamaterial antennas can also be realized by epsilon negative transmission line (ENG‐TL) .…”