초록 ▼

An elongated rod 11 of dielectric material, for example fiberglass－plastic or the like, has a central conductor (12) located coaxially therein, the conductor having a length L=3/2 ll13, 16, 20, 25), for example of conductive lacquer, a mesh or braid of conductive material, a conductive foil or tube

An elongated rod 11 of dielectric material, for example fiberglass－plastic or the like, has a central conductor (12) located coaxially therein, the conductor having a length L=3/2 ll13, 16, 20, 25), for example of conductive lacquer, a mesh or braid of conductive material, a conductive foil or tube or the like. In the lower l1, the bottom terminal of the central conductor will provide a high resistance output for the higher one of the frequency ranges which, for example, can be a radio telephone, or vehicular communication frequency of between 450-470 MHz. The entire antenna is suitable as an AM-FM/radio-telephone combination antenna. l27). The band width of the antenna can be extended by placing a further electrically conductive layer (513, 619, 722, 828) on the rod, spaced by a gap (a) physically and electrically from the conductive layer (13, 16, 20, 25) in the middle of the elongated rod. The further conductive layer is l12, 512), which in turn can be coupled to an antenna input, for example the center conductor of a coaxial cable of a radio apparatus.

대표청구항 ▼

Vehicular multi-range rod antenna for combined use in the broadcast or radio frequency band ranges for amplitude-modulated (AM) broadcast radio reception and for frequency-modulated (FM) broadcast radio reception, and the mobile radio telephone frequency range of about 450 MHz to 470 MHz, wherein sa

Vehicular multi-range rod antenna for combined use in the broadcast or radio frequency band ranges for amplitude-modulated (AM) broadcast radio reception and for frequency-modulated (FM) broadcast radio reception, and the mobile radio telephone frequency range of about 450 MHz to 470 MHz, wherein said mobile radio telephone range defines a medium wave length l3/2 ll2 length; a coaxial conductor (512) extending within the entire length of the rod, and having a physical length within said rod of 3/2 ll2 and being located in the middle third length portion (L2) of said elongated rod; and an additional conductive outer layer (513, 619, 722; 828) located at the lower third length portion (L1) of said elongated rod of dielectric material, said additional conductive outer layer having a physical length of about l2, being electrically connected to said coaxial conductor (512) and being electrically insulated with respect to said first conductive outer layer.