Abstract: The present invention provides a balanced dipole unit and a broadband omnidirectional collinear array antenna formed by the balanced dipole unit. Balanced dipole unit circuits in the balanced dipole unit are symmetrically distributed on two sides of a circuit carrier, and a feeder and a ground wire in the balanced dipole unit are also symmetrically distributed, so that the balanced dipole unit has a completely symmetrical structure. A principle of the symmetrical structure is the same as a differential design principle and a self-balancing principle in the circuit design, thereby reducing current coupling between the balanced dipole units and eliminating the need of using an additional choke circuit when a broadband omnidirectional collinear array antenna is formed by the balanced dipole unit.

Abstract: The present invention provides a balanced dipole unit and a broadband omnidirectional collinear array antenna formed by the balanced dipole unit. Balanced dipole unit circuits in the balanced dipole unit are symmetrically distributed on two sides of a circuit carrier, and a feeder and a ground wire in the balanced dipole unit are also symmetrically distributed, so that the balanced dipole unit has a completely symmetrical structure. A principle of the symmetrical structure is the same as a differential design principle and a self-balancing principle in the circuit design, thereby reducing current coupling between the balanced dipole units and eliminating the need of using an additional choke circuit when a broadband omnidirectional collinear array antenna is formed by the balanced dipole unit.

Abstract: An antenna assembly for use in a vehicle is provided, whereby the assembly is preferably concealed within a vehicle bumper or non-conductive fender. The assembly includes a flexible antenna radiator directly connected with an output of a tunable matching circuit contained within a housing, whereby the housing further provides a connection means between the input of the matching circuit and a radio system in the vehicle. The matching circuit is tunable by control means provided externally on the housing, enabling the antenna assembly to be easily tuned prior to or during installation. The inventive antenna assembly advantageously provides a low cost antenna with ease of installation, small size, and direct integration with a tunable matching circuit.