Patent ID: 6927735

Claim:
A radio antenna arrangement disposed in the surface of an electrically conductive vehicle chassis and having a connection point comprising: a substantially rectangular aperture formed in the surface of the vehicle having aperture length L and aperture width B, where B is approximately L/3 or less in the meter wavelength region, wherein said aperture length L is sufficiently small so that the self-resonant frequency (fs) of said aperture is greater than the center frequency of the operating frequency range; a capacitive tuning element disposed in said aperture for tuning the resonance of the aperture to a resonant frequency f o to approximately the center frequency of the operating frequency range, said capacitive tuning element acting as capacitive connection between the edges of said aperture, and formed as a low-inductance element so that due to the residual inductive effect, the remaining magnetic reactive power is as small as possible relative to the magnetically generated reactive power from the magnetic fields in said aperture and; an input coupling element disposed in said aperture for coupling the antenna connection point to the electromagnetic field enhanced by resonance in the aperture.