Composite right/left‐handed wideband metamaterial antenna loaded with SRRs and CSRRs to improve gain and efficiency

Abstract

A coplanar waveguide‐fed metamaterial antenna is presented. The proposed antenna is composed of two‐unit cell composite right/left‐handed transmission line (CRLH‐TL) loaded with split ring resonators (SRRs) and complementary SRRs (CSRRs). The wideband characteristic is obtained by merging the three closely spaced resonances of CRLH‐TL. The loading of SRRs and CSRRs not only improves the impedance matching but also enhances the overall gain and radiation efficiency. The measured results show a −10 dB fractional bandwidth of 67% (6.48–13 GHz) with the realised gains of 2.98, 3.43, 3.15, 2.75 and 2.61 dBi at the resonant frequencies 8.3, 9.2, 10.3, 11 and 12 GHz, respectively. The radiation efficiency is above 67% over the entire band of operation with a peak value of 81.72%. The measured results agree well with the simulated results. The proposed antenna is suitable for X‐band (8–12 GHz) applications.

Composite right/left‐handed ultra‐wideband metamaterial antenna with improved gain

“…The substrate‐1 is embedded with a CRLH unit‐cell on the top surface and on the bottom surface an SRR and a PRIS have been loaded as shown in Figure 1B. The distributed circuit elements of CRLH unit‐cell can easily be recognized by linking it with the corresponding equivalent circuit model as provided in Reference 39. This comparison shows that the gap of width g 3 and the meander line provide the left‐handed components whereas the rectangular patch of length L 3 and its coupling with CPW ground plane provide the right‐handed components, respectively.…”

Dual‐band frequency‐reconfigurable MIMO PIFA for LTE applications in mobile hand‐held devices

“…Using the adaptive concept, the MIMO channel performance can be enhanced for three kinds of user effects, namely, specific anthropomorphic mannequin (SAM) head (4.2 W/kg) and personal digital assistants (PDA) hand (talk mode), PDA hand (data mode), and dual hands (read mode) for the improvement of MIMO channel capacity with user effects. The gain and radiation efficiency of MIMO antenna is improved by loading CRLH antenna with SRR and CSRR [22]. When the inter-element spacing greater than critical distance, the better impedance matching is achieved which reduces the ECC and enhances the total efficiency of the antenna [23].…”

Bandwidth and gain‐enhanced composite right/left‐handed antenna for ultra‐wideband applications

“…One of the most extensively used techniques is mode coupling, in which a number of closely spaced resonances are merged together in a single passband with proper frequency spacing. Based on this technique, a number of bandwidth‐enhanced MTM antennas have been reported in literature . In References 26 and 27, first negative‐order resonance (FNOR), ZOR and first positive‐order resonance (FPOR) are merged together to achieve the bandwidths of 67% and 61.1% respectively.…”

“…Based on this technique, a number of bandwidth‐enhanced MTM antennas have been reported in literature . In References 26 and 27, first negative‐order resonance (FNOR), ZOR and first positive‐order resonance (FPOR) are merged together to achieve the bandwidths of 67% and 61.1% respectively. Whereas, the ZOR is combined with FPOR in References 28 and 29 to enhance the bandwidths up to 41% and 39% respectively.…”