Abstract: An aircraft antenna includes an aerodynamic housing structured for attachment to an outer surface of an aircraft, and the housing contains an electromagnetic radiator and tuned over a first band of frequencies to produce a first function, and a second electromagnetic radiator to produce a second function, said radiators being arranged to decouple the first radiator and the second radiator from each other.

Abstract: An aircraft antenna includes an aerodynamic housing structured for attachment to an outer surface of an aircraft, and the housing contains an electromagnetic radiator and tuned over a first band of frequencies potentially to produce secondary radiations in at least a second band of frequencies, and a suppression filter effective at the frequencies of the secondary radiations.

Abstract: An antenna array includes two acutely bent dipole antenna elements placed back-to-back on a printed circuit board with integrated micro-strip balun transformers which a Wilkinson divider drives 180 degrees out of phase. In an embodiment, the antenna array sits on a vertical blade support structure to form a T-Top section.

Abstract: A monopole antenna for aircraft, vehicles, marine vessels and the like comprises a coaxial cable radiator and a metal tube radiator surrounding the lower half of the coaxial cable. The center conductor of a coaxial cable connector applies radiant energy to the jacket of the coaxial radiator. The center conductor of the coaxial radiator extends from the bottom of the cable and is connected to the outer lower surface of the metal tube radiator. In operation, the distributed L-C and R-C values at resonance couple radiation energy to the metal tube radiator while the tube suppresses radiation from the jacket except for radiation from the upper portion thereof. Tests comparing the radiation pattern of the above antenna without ground plane and a conventional monopole antenna with ground plane indicate that the radiation pattern is extended in the forward, axial (zero degree) direction although some loss occurs in the + and -90 degree direction.

Abstract: A combination antenna for aircraft and the like capable of transmitting and receiving VHF signals and receiving GPS signals comprising a VHF monopole antenna assembly and a GPS patch antenna assembly located within a common aerodynamically shaped dielectric housing. Separate connectors connect coaxial cables to the two assemblies and assembly elements are provided to suppress cross coupling of signal harmonics and noise from the transmitted VHF signals to enhance isolation of the received signals for the GPS and VHF functions. No adding or separation of the VHF and GPS signal information is required and the low patch antenna profile enables a low and aerodynamically shaped antenna for the beneficial use on small aircraft.

Abstract: A monopole radiating blade antenna comprising a driving, high impedance stub mounted to the face of the blade that functions as part of the radiator as well as part of a shunt path between the blade and the base plate. The shunt path is completed by an air coil inductor connected between the center conductor of the stub and the base plate. One embodiment provides the input connector wire and stub in vertical alignment along the center vertical axis of the blade. Another embodiment arranges the stub to be off-set from the input wire. Some advantages over conventional blade antennas include increased gain at low angles of elevation above the horizon, good impedance match over a wide range of frequencies without using conventional 1/4 wave length stub matching that can introduce dielectric losses, low resistance to ground to bleed off static electricity and lightning, non-loading of the high impedance path at design frequencies, and good accommodation of 5/8 wavelength radiator blade dimensioning.