Antennas for use in portable communications devices
AssigneeGriffith University
InventorsDavid V. Thiel, Steven G. O'Keefe, Jun W. Lu
Life of this patent
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Abstract
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.
Claims22
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;
- and
- switching 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.
A shielding structure for the antenna of a portable communications device, the structure comprising the sandwiched arrangement of a reflective element, a dielectric material and an antenna array comprising an array of parallel wire elements, ones of which are active and the others of which are parasitic, the shielding structure being arranged so that the reflective element is closer to a user's head than the antenna element in use in the communications device.
A directional antenna arrangement comprising:
- a dielectric cylinder having a surface;
- a non-planar symmetric array of wire antenna elements located parallel to the surface of the dielectric cylinder and positioned within or on the surface of the dielectric cylinder;
- and
- switching means 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.
A directional antenna arrangement comprising:
- a dielectric structure having a surface;
- at least one wire antenna element located within or on the surface of the dielectric structure, each antenna element being arranged to be parallel with, and offset from, a longitudinal axis of the dielectric structure;
- and
- switching means electrically connected to each antenna element, the switching means being controllable to selectively switch an antenna element to be either active or parasitic.
Dependencies are inferred from the claim text.