Concealed antenna applying electrically-shortened elements and durable construction
OwnerMark M. Forbes, John H. Kernkampinventors
Life of this patent
Estimating the term…
Abstract
A means for concealing an antenna within an extension of a common roof structure using an electrically shortened element laminated between two layers of non-RF conductive material which add to the strength of the invention as well as concealability. The antenna itself comprises a vertical radiator and a helical counterpoise of metal strip, wire, or deposited metal fed at the center point. The entire antenna is housed between laminated layers of plastic in the form of a vent pipe.
Claims18
A concealed antenna combination including a roof of a structure, a vent pipe extending below said roof and having an upper exposed portion projecting above said roof, an antenna mounted on the upper exposed portion of said vent pipe, said antenna comprising a first dielectric tube having an inner and outer surface, an antenna conductor carried on said outer surface, a dielectric covering to conceal said antenna conductor on said outer surface, and means mounting said dielectric covering and said first dielectric tube on said vent pipe forming an extension thereof.
A vent pipe and antenna combination comprising first and second cylindrical dielectric tubes, said first tube having an inner and outer surface, a linear antenna conductor bonded to said outer surface of said first tube and having a width which is a small fraction of the circumferential extent of said first tube, means to seal the first and second tubes together to form an integral laminated structure;
- and means mounting said laminated structure on said vent pipe to form an extension thereof;
- wherein said combination vent pipe and antenna is mounted in a vertical position, a helical counterpoise mounted on said outer surface below said linear antenna conductor;
- and a transmission line coupled to the input of the linear antenna conductor and to a top portion of said counterpoise.
A combined antenna and fluid conducting tube comprising a dielectric tube having an inner and outer surface, said inner surface forming a smooth bore open at both ends to accommodate the passage of fluid, an antenna bonded to the outer surface of said dielectric tube;
- and a dielectric covering for said antenna secured to said outer surface;
- wherein said antenna comprises a linear monopole having a feed input at one end, a helical counterpoise extending away from said feed input;
- and a coaxial cable feeding power to said antenna with the center conductor of said coaxial cable connected to said monopole and the outer conductor connected to said counterpoise.
Dependencies are inferred from the claim text.