초록 ▼

In one embodiment, an antenna has four equally spaced monopole elements mounted in a symmetric array on the outer surface of a solid cylinder structure. The cylinder has a high dielectric constant, and extends from a conductive ground plane. The monopole elements can be switched by switching element

In one embodiment, an antenna has four equally spaced monopole elements mounted in a symmetric array on the outer surface of a solid cylinder structure. The cylinder has a high dielectric constant, and extends from a conductive ground plane. The monopole elements can be switched by switching elements so that one or more is active, with the others acting as parasitic directors/reflectors being connected commonly to ground or left in an open circuit condition to be effectively transparent.

대표청구항 ▼

[ We claim:] [1.] A directional antenna arrangement comprising:a dielectric structure having a surface;a non-planar array of wire antenna elements located parallel to the surface of the dielectric structure, the antenna elements embedded within or positioned on the surface of the dielectric structur

[ We claim:] [1.] A directional antenna arrangement comprising:a dielectric structure having a surface;a non-planar array of wire antenna elements located parallel to the surface of the dielectric structure, the antenna elements embedded within or positioned on the surface of the dielectric structure; andswitching means electrically connected to the antenna elements, the antenna arrangement being operable by the switching means to selectively switch one or more of the antenna elements to be active, the non switched antenna elements being parasitic.