Design of Miniaturized Dual-Band Artificial Magnetic Conductor with Easy Control of Second/First Resonant Frequency Ratio

Abstract

A novel miniaturized artificial magnetic conductor (AMC) is proposed for dual-band operation. An AMC unit cell that employs four slots in the metallic patch is used to achieve miniaturization as well as easy control of the second/ first resonant frequency ratio, which can be varied from 1.5 to 3.26 by simply changing the slot shape for a given metallic patch size. A dual-band antenna composed of a wideband monopole suspended over the proposed AMC surface is designed and tested to validate this approach. The measurements result in a satisfactory and good matching condition for the dual-band antenna.

Improved Performance of Double-T Monopole Antenna for 2.4/5.6 GHZ Dual-Band Wlan Operation Using Artificial Magnetic Conductors

“…As observed from reflection coefficient of the monopole antenna with new AMC structure in Fig. 10, there is another resonance frequency between two mentioned frequencies due to the inductive and capacitive properties of the new added slots [17][18][19]. However, because of the lack of sufficient gain and suitable patterns, this resonance frequency is not very useful.…”

“…However, increasing the overall dimensions of the AMC structure for decreasing the first resonance frequency is not preferred. One method for decreasing the first resonance frequency is adding slot in every side of the metal square plate in order to increase its length [17,18]. First, adding one slot in every side of the square plate is tested and optimized for achieving the desirable result which is stated above.…”

Application of metasurfaces in the design of performance-enhanced low-profile antennas

“…A novel miniaturized dual-band metasurface structure was utilized for dual-band operation. A metasurface unit cell that employs four slots in the metallic patch was used to achieve miniaturization as well as easy control of the second/first resonant frequency ratio by simply changing the slot shape for a given metallic patch size [42,43]. A dual-band metasurface structure was employed as a reflector to achieve a low profile and broadband characteristics for dual-band operation with a large frequency ratio [42].…”

“…Another dual-band antenna composed of a wideband planar monopole horizontally suspended over the dualband metasurface structure was designed and tested [43]. The measurements resulted in a good matching condition for the dual-band antenna.…”

Ferrite-Loaded Inverted Microstrip Line-Based Artificial Magnetic Conductor for the Magnetic Shielding Applications of a Wireless Power Transfer System

“…Another approach for achieving complete magnetic shielding while improving the PTE is to use a perfect magnetic conductor (PMC) as a back plate, which can be realized by designing artificial magnetic conductors (AMCs) [20]. Ideally, the AMC can provide a ±180 • reflection phase owing to its high surface impedance and parallel image current, and eliminate backward radiation while enhancing the radiation toward the front when it is placed behind the antenna [21][22][23][24]. As it acts as a reflector, greatly enhancing unidirectional radiation with increased efficiency, the AMC design is widely used in the microwave frequency of the low-profile, relatively high-gain antenna design.…”