A very small shoulder pad planar antenna for mobile radio applications

In mobile portable radios for police and fire services, the antenna structure should be chosen so as not to interfere with an operator´s duty or not to degrade the antenna performance. However, a conventional whip antenna mounted on the radio body is difficult to meet these requirements and several studies have been reported on a human body mounted antenna for such public service portable radios. This paper presents a new antenna attached on a shoulder with a simple structure in the 350-MHz band. This new shoulder pad planar antenna features its extreme compactness while maintaining a high gain and small impedance changes in the presence of human body.