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Multi-frequency printed microwave absorber with adjacent absorption peaks by dual-layer technique
(2017-12-19)
Khoomwong, Ekajit
;
Phongcharoenpanich, Chuwong
A multi-frequency printed microwave absorber with very close absorption peaks is designed using a dual-layer technique. The absorption ranges are applicable in the lower WiMAX bands with the adjacent bands (i.e. 2.3/2.7GHz), and also covering almost all U-NII-1/2/3 bands. The absorber consists of two layers with simple rectangular copper patterns, which can improve the modeling and manufacturing accuracy. The design processes are based on numerical simulations. The results show three absorption bands with bandwidths (at 50%) of 140MHz (2.27-2.41GHz), 130MHz (2.68-2.81GHz) and 740MHz (5.025.76GHz). The absorption peaks in each band (i.e. at 2.35, 2.75 and 5.45GHz) are at 98.7%, 85.0% and 99.5%, respectively. The presented absorber exhibits fairly wide-angle characteristics of wave incidence. The advantages of the proposed absorber are thin, simple and low-cost with adjacent absorption peaks, which is suitable for various applications in the lower-band WiMAX and the U-NII frequency ranges, simultaneously.
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Simple and Low-Cost Dual-Band Printed Microwave Absorber for 2.4-and 5-GHz-Band Applications
(2017-10-26)
Khoomwong, Ekajit
;
Phongcharoenpanich, Chuwong
In this research, a dual-band thin printed-circuit-board (PCB) microwave absorber has been proposed for applications in 2.4 and 5 GHz frequency bands. Each unit cell of the absorber consists of a square ring and a thick cross-dipole, augmented with the tuning elements. In the design process, numerical simulations were performed for the optimal characteristics of the absorber and an absorber prototype was fabricated using the simple print-Transferring and etching process. The measured absorption bandwidths (50 %) of 170 MHz (2.36-2.53 GHz) and 830 MHz (5.09-5.92 GHz) were achieved for the first and second bands, respectively, with the wideband characteristic at the second operating band. The absorption rates near the center frequencies (2.45 and 5.5 GHz) were respectively 97.85 % and 97.76 %. The simulation and measured results are in good agreement. Furthermore, the incidence-Angle dependencies of the absorber were of moderately wide angles with the absorption capacity of at least 50 % for both operating bands. The proposed absorber is suitable for a variety of applications requiring absorption in the 2.4/5 GHz bands.
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Dual-band thin printed microwave absorber
(2016-09-06)
Khoomwong, Ekajit
;
Santaluna, Samran
;
Phongcharoenpanich, Chuwong
A dual-band thin printed-circuit-board (PCB) microwave absorber is proposed for applications in 2.4 and 5 GHz frequency bands. Each unit cell of the absorber utilized a simple combination of a square ring and a thick cross-dipole with some additional tuning elements. In the design process, numerical simulations were performed first for optimal characteristics, and then a prototype absorber was created successfully by simple print-transferring and etching processes. The measured absorption bandwidth (50%) of 170 MHz (2.36-2.53 GHz) and 830 MHz (5.09-5.92 GHz) are achieved for the first and second band, respectively, with the wideband feature at the second operating band. The absorption at the center frequencies of bands, 2.45 and 5.5 GHz, are also found feasible at 97.85% and 97.76%, respectively. From the experiments, the proposed absorber was suitable for many applications requiring absorptions in the 2.4/5GHz bands as desired. The measured results were agreed well with ones from the simulations. The advantages of the proposed absorber are thin, simple and low-cost structure that can be useful for cost-effective applications.

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