Title :
Radiation and bandwidth characteristics of two planar multistrip antennas for mobile communication systems
Author :
Ollikainen, Jani ; Vainikainen, Pertti
Author_Institution :
Radio Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
The measured radiation and bandwidth characteristics of two slightly different short-circuited microstrip patch antennas are reported. The bandwidth of the studied antennas bag been enhanced by dividing one wider patch into separate narrower patches which are tuned to different resonant frequencies. One of the patches is fed and the others are parasitically coupled. The results indicate that without increasing the volume occupied by the antenna its impedance bandwidth can be more than doubled with this method. In addition, the study shows that the use of parasitic elements may cause the polarization of the antenna to become frequency dependent
Keywords :
antenna radiation patterns; antenna testing; directive antennas; electric impedance; electromagnetic wave polarisation; land mobile radio; microstrip antenna arrays; mobile antennas; planar antenna arrays; directive antennas; frequency dependent polarization; impedance bandwidth; measured bandwidth characteristics; measured radiation characteristics; mobile communication systems; parasitic elements; parasitically coupled patches; planar multistrip antennas; resonant frequencies; short-circuited microstrip patch antennas; Antenna measurements; Bandwidth; Circuits; Frequency measurement; Impedance; Microstrip antennas; Mobile antennas; Mobile communication; Resonance; Slot antennas;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686426
