Reconfigurable epsilon negative metamaterial antenna

Abstract

In this paper, frequency reconfiguration is implemented on an epsilon negative metamaterial (ENG-MTM) antenna. Switching on/off the MTM unit cells via the inductive stubs reconfigures the resonance frequency. Copper strips are use as switches. In effect, the antenna can be reconfigured from narrow to wideband and the zero order resonance (ZOR) frequency can also be reconfigured from 1.9 GHz to 2.6 GHz with reflection coefficient of -16.97dB and -21.5dB respectively and total efficiency of 0.914dB. The antenna has potential application for cognitive radio system.

Meta-Wearable Antennas—A Review of Metamaterial Based Antennas in Wireless Body Area Networks

“…Generally, there are three kinds of forms in CRLH zero-order resonance antennas: Epsilon-negative resonance (ENR) [ 56 , 68 , 69 , 72 , 73 ], Mu-negative resonance (MNR) [ 14 , 48 , 49 , 50 , 51 , 52 ], and dual-negative resonance (DNR) [ 53 , 54 , 77 , 78 , 79 , 80 ]. ENR is enabled by loading shunt inductance in the equivalent circuit of a conventional transmission line, and the effective permittivity of the unit cell is negative.…”

“…In the wearable antenna field, the research on ENR and MNR zero-order mode antenna is rare. However, the proper utilization of them on other kinds of antennas has been published [ 48 , 49 , 50 , 51 , 52 , 56 , 68 , 73 ]. Considering the difficult implementation of both the capacitors and the inductors, new types of metamaterials that support only ENR or MNR mode is a new direction in wearable ZOR antennas.…”

“…Generally, there are three kinds of forms in CRLH zero-order resonance antennas: Epsilon-negative resonance (ENR) [56,68,69,72,73], Mu-negative resonance (MNR) [14,[48][49][50][51][52], and dual-negative resonance (DNR) [53,54,[77][78][79][80]. ENR is enabled by loading shunt Generally, there are three kinds of forms in CRLH zero-order resonance antennas: Epsilonnegative resonance (ENR) [56,68,69,72,73], Mu-negative resonance (MNR) [14,[48][49][50][51][52], and dual-negative resonance (DNR) [53,54,[77][78][79][80]. ENR is enabled by loading shunt inductance in the equivalent circuit of a conventional transmission line, and the effective permittivity of the unit cell is negative.…”

“…The use of metamaterials has been hugely successful in adapting conventional antenna designs into a wearable form, including composite right/left-handed transmission lines (CRLH TLs) based antennas [ 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ], zero-order antennas [ 55 , 56 ], metamaterials-inspired antennas [ 32 , 57 ], artificial magnetic conductor (AMC) [ 58 , 59 , 60 , 61 ], electromagnetic band-Gap (EBG) [ 62 , 63 , 64 , 65 ], and High-Impedance Surface (HIS) [ 16 ]. Wearable antennas have been designed with properties such as multiple band operations [ 48 , 55 ], multiple functionalities [ 66 , 67 , 68 , 69 ], and gain enhancement [ 70 , 71 ] while maintaining a low profile and compact size [ 56 , 72 , 73 ] due to the development of the electromagnetic metamaterials tech. Besides the methods above, characteristic mode theory is also an excellent analysis approach to study the metamaterials-based antennas [ 74 , 75 , 76 ], and it improves the efficiency of antennas design in WBAN.…”