A Dual-Band Metasurface Reflector Using Ring Resonator With Interdigital Capacitor

Abstract

This research presents a metasurface reflector to support dual-band applications at 1.8 GHz and 5.5 GHz for LTE and WLAN, respectively. The proposed unit cell creating the metasurface has the property of an epsilon negative medium (ENG) that is one of the reflector requirements. The novel design of unit cells uses the ring resonator pattern associated with an interdigital capacitor to control resonant frequencies and relative permittivity. The epsilon negative medium can be controlled by using an interdigital capacitor that can create the electric field at the unit cell. Therefore, the size of the metasurface can be reduced from λ/2 to λ/4 which is much smaller than the conventional structure, resulting in a compact reflector when it works together with an antenna. The proposed unit cell was designed to obtain the dual-frequency operation with simulated bandwidth of 1.71 GHz -2.48 GHz at 1.8 GHz and 5.15 GHz -6.00 GHz at 5.5 GHz, respectively. The proposed metasurface was designed by using an array of 7×7 unit cells. The simulation and experimental results agree very well with the gains of 8.52 dB and 9.55 dB at 1.8 GHz and 5.5 GHz, respectively.

A polarization‐insensitive metamaterial absorber for moisture‐sensing applications of agriculture products

“…6,7 Because of their extranatural properties, metamaterials provide greater sensitivity and accuracy than traditional structures. 8 In comparison to a general structure that is not proportional to the operating frequency, they also reduce the sensor size. 9 As a result, for the past decade, metamaterials have been widely used in sensor applications.…”

“…Metamaterial sensors are widely used in industrial, scientific, and medical applications because of their benefits, which include high sensitivity, flexibility, lower manufacturing costs, and ease of measurement 6,7 . Because of their extranatural properties, metamaterials provide greater sensitivity and accuracy than traditional structures 8 . In comparison to a general structure that is not proportional to the operating frequency, they also reduce the sensor size 9 .…”

Tri-band metasurface absorber based on square rotational symmetry

“…Qu et al [17] fabricated an electromagnetically induced transparent metamaterial with two absorption peaks in the terahertz band. Chomtong et al [18] designed a supersurface that could achieve perfect absorption of two frequency bands in the microwave band. Han et al [19] proposed a triband metamaterial absorber in terahertz band, which has the characteristics of polarization stability and good sensitivity.…”

Substrate Comparison on Multiband Reflector Performance for Intelligent Reflecting Surfaces (IRSs)

“…In addition, other metasurfaces for dual band design are reported in [8] and [9]. A dual band metasurface design using a ring resonator with interdigital capacitors is designed to a reflector antenna in [5] where it is suitable to operate for LTE (1.8 GHz) and WiMAX (3.7 GHz).…”