Title :
A shoulder-mounted planar antenna for mobile radio applications
Author :
Ogawa, Koichi ; Uwano, Tomoki ; Takahashi, Masao
Author_Institution :
Device Eng. Dev. Center, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
5/1/2000 12:00:00 AM
Abstract :
A new planar antenna, suitable for use on a shoulder, has been studied for police and fire service portable radios in the 350-MHz band. This shoulder-mounted antenna, which is a type of planar inverted F antenna (PIFA), features extreme compactness while maintaining a higher gain than that of a conventional whip antenna and small impedance changes in the presence of a human body. The low-profile structure enables the antenna to be unseen when the operator wears a jacket. A prototype of the antenna has been built and tested, and the measured impedance characteristics and the radiation patterns are presented. Emphasis is placed on the effect of the human body. The antenna provides a gain of -5.5 dBd, which is 3.5 dB higher than that of a whip antenna. Field measurements verified the excellent performance under a multiple propagation environment
Keywords :
UHF antennas; antenna radiation patterns; antenna testing; electric impedance; emergency services; mobile antennas; planar antenna arrays; police; -5.5 dB; 350 MHz; Field measurements; PIFA; UHF; antenna gain; fire service portable radio; human body; low-profile structure; measured impedance characteristics; mobile radio applications; multiple propagation environment; performance; planar inverted F antenna; police service portable radio; radiation patterns; shoulder-mounted planar antenna; small impedance changes; whip antenna; Antenna measurements; Antenna radiation patterns; Antennas and propagation; Fires; Humans; Impedance measurement; Land mobile radio; Planar arrays; Prototypes; Testing;
Journal_Title :
Vehicular Technology, IEEE Transactions on
