Title :
An optimized antenna for mobile phones
Author :
Geissler, M. ; Heberling, D.
Author_Institution :
Inst. for Mobil-und Satellitenfunktech., Kamp-Lintfort, Germany
Abstract :
IMST is investigating the user´s influence on the radiation characteristics of mobile phones. If a handset is in a typical user position, the radiated power is strongly decreased because of the losses in the user´s body. This effect depends on the kind of antenna that is used for the mobile. Several concepts of optimized handset antennas have been developed. These antennas have a better overall efficiency, meaning that the percentage of the power absorbed by the user´s body is minimized. The advantages of these concepts are high radiated power, low SAR values (specific absorption rate) and a longer standby time in the handset. One of these concepts, the EID antenna, is presented. The EID antenna has been simulated and realized at 450 MHz and at 925 MHz.
Keywords :
UHF antennas; antenna radiation patterns; antenna testing; mobile antennas; optimisation; telephone sets; EID antenna; IMST; UHF; efficiency; high radiated power; losses; low SAR; mobile phones; optimized antenna; optimized handset antennas; radiated power; radiation characteristics; simulation; specific absorption rate; standby time; user position; Conducting materials; Dielectric materials; Helical antennas; Humans; Inorganic materials; Mobile antennas; Mobile handsets; Moment methods; Permittivity; Telephone sets;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1998. IEEE
Print_ISBN :
0-7803-4478-2
DOI :
10.1109/APS.1998.699088
