Methodology to keep the same radiation efficiency while miniaturizing an antenna

Miniaturization of a Filter-Antenna Device by Co-Design

“…Results are reminded in Fig. 11 and they constitute the most significant results of our previous paper [13]. Indeed, in our optimization process, the same radiation efficiency was kept at 2.5 GHz while dividing the antenna volume by two.…”

“…7-b, and a good agreement is now obtained. In [13], we developed two monopolar wire-patch antennas made with a Rogers RO4003 substrate (permittivity r = 3.55 and loss tangent of 2,7x10 -3 ) on a 90mm x 90mm ground plane having the same radiation efficiency at 2.5 GHz: − The first one was matched on 50 Ω and exhibited dimensions of 24 mm x 24 mm x 4 mm (λ0/5 x λ0/5 x λ0/30 at 2.5 GHz) corresponding to a volume of 2304 mm 3 . It is called the reference antenna.…”

“…Indeed, a balanced miniature inverted-F-inspired circular antenna with a radius equals to λ0/28 at 433MHz and a 50% radiation efficiency is presented. In [13], we presented a miniaturization technique of a monopolar wire patch antenna, while seeking to preserve its radiation efficiency. In section II of this paper, the co-design strategy where the 50 ohms interconnection constraint is released will be recalled.…”

“…Therefore, the effect of real and then complex loads on filter performances will be studied in the co-design approach detailed in section V. In section IV, a study on the miniaturization of an antenna will be presented. This study is based on our previous paper [13] where we presented a methodology to keep the same radiation efficiency while miniaturizing an antenna. Indeed, an antenna with a reduced volume of more than 50% is optimized at 2.5 GHz on a particular impedance location, different from 50Ω.…”