On the bandwidth and geometry of dual-band AMC structures

International audienceIn this paper, the bandwidth and dimensions of different dual-band Artificial Magnetic Conductors (AMCs) for 2.5/5.5 GHz WiFi applications are compared. The simulation results indicate that the double hexagon structure presents a superior performance compared to the others. The measured results of two different structures are in very good agreement with the simulated ones, and hence, the study is validated. © 2016 European Association of Antennas and Propagation

Design methodology for wearable antenna on artificial magnetic conductor using stretch conductive fabric

International audienceThe current practice for designing antennas over artificial magnetic conductor (AMC) is time and labour intensive. A novel methodology is described for saving time and effort in designing such antennas. The proposed method is based on using conductive fabric as a radiating element. The method is validated via the design of a textile dual-band monopole antenna on AMC covering both WiFi and the 4G long term evolution (LTE) frequency band

Investigation of Flexible Textile Antennas and AMC Reflectors

In this paper, two different methods for fabric characterization are presented: a single frequency method and a broadband method. Felt and denim fabrics are characterized, and patch antennas are designed using these substrates to test both methods. Prototypes of the antennas on felt and denim are manufactured using conductive textile (called electrotextile) aiming to obtain fully flexible antennas. The prototypes are characterized in anechoic chamber to be compared and obtain conclusions related to the characterization methods. A new dual-band hexagonal AMC reflector combinable with antennas is also proposed to improve their performance and reduce the backward radiation to the human body. A novel broadband CPW-fed monopole antenna is designed to be combined with the AMC. The resulted prototype is characterized and compared with the performance of the CPW-fed antenna alone

Efficient small switchable ribbon monopole antenna for VHF/UHF maritime applications

International audienceThis paper describes the development of a small ribbon monopole antenna for UHF and VHF frequency maritime applications. A LC-matching circuit is used to switch from UHF to VHF band, without degrading the antenna's performances. Experimental and numerical results demonstrate that the proposed antenna exhibits a bandwidth of approximately 12.3% and 4% for UHF (420 MHz) and VHF (167 MHz) respectively. The total efficiency of the antenna was measured with two methods (reverberation chamber and Wheeler cap): it was higher than 90% in the both UHF and VHF bands. © 2016 European Association of Antennas and Propagation

Wearable antennas for firefighters

National audienc