A Compact Frequency-Reconfigurable Metamaterial-Inspired Antenna

Abstract

Adding frequency reconfigurability to a compact metamaterial-inspired antenna is investigated. The antenna is a printed monopole with an incorporated slot and is fed by a coplanar waveguide (CPW) line. This antenna was originally inspired from the concept of negative-refractive-index metamaterial transmission lines and exhibits a dual-band behavior. By using a varactor diode, the lower band (narrowband) of the antenna, which is due to radiation from the incorporated slot, can be tuned over a broad frequency range, while the higher band (broadband) remains effectively constant. A detailed equivalent circuit model is developed that predicts the frequency-tuning behavior for the lower band of the antenna. The circuit model shows the involvement of both CPW even and odd modes in the operation of the antenna. Experimental results show that, for a varactor diode capacitance approximately ranging from 0.1-0.7 pF, a tuning range of 1.6-2.23 GHz is achieved. The size of the antenna at the maximum frequency is and the antenna is placed over a CPW ground plane ( being the wavelength in vacuum).Index Terms-Circuit models, coplanar waveguide (CPW), frequency-agile antennas, metamaterials (MTMs), microstrip antennas, multifrequency antennas, printed monopole, reconfigurable antennas, slot antennas, varactors.

Inspirasi Antena Metabahan yang Boleh Dikonfigurasi untuk Komunikasi 5G

“…Antena berasaskan metabahan indeks negatif dibentangkan dengan jalur sempit disalurkan melalui frekuensi yang luas (daripada 1.60 hingga 2.23 GHz), manakala band yang lebih tinggi tetap malar dengan menggunakan diod varaktor (kemuatan daripada sekitar 0.1 hingga 0.7 pF). Selain itu, jumlah dimensi antena tembikar 0.056λ 0 × 0.047λ 0 diletakkan di atas 0.23λ 0 × 0.111 λ 0 satah tanah CPW (Mirzaei et al 2011). Pada tahun 2007 Liu et al mencipta antena tampalan fraktal boleh dikonfigurasi dua band dengan suis terukir pada slot antena dan dengan menukar keadaan suis, corak radiasi antena berubah sekitar 60.0 dan 80.0 GHz, yang meliputi sudut ketinggian 130 hingga 450, -130 -450 sekitar 60 GHz dan 150 hingga 500, -150 hingga -500 sekitar 80 GHz (Liu et al 2011).…”

Broadband monopole antenna with split ring resonator loaded substrate for good impedance matching

“…Impedance matching over a broad range of frequencies is a challenging one. Good impedance matching was obtained by changing the size of the ground plane, dimensions of the antenna, distance between feed point and ground . Reactive lumped elements can also be used for good impedance matching .…”

Reconfigurable epsilon negative metamaterial antenna

“…Only few studies on reconfigurable MTM antennas have been presented. In [2], the frequency reconfiguration was achieved through slot and internal loaded on lumped elements on a monopole antenna. In [3], frequency reconfiguration was obtained through the use of split ring resonators as parasitic elements to a printed monopole.…”