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Hybrid antenna system for a portable wireless communication device

Imported: 23 Feb '17 | Published: 22 Oct '02

Allen Minh-Triet Tran

USPTO - Utility Patents

Abstract

A hybrid antenna system for a portable Wireless Communication Device (WCD) includes a concealed, internal shielded substrate antenna fixedly mounted to and wholly internally within a casing of the portable WCD. The hybrid antenna system also includes a displaceable antenna, such as a whip antenna, that is selectively extendable from and retractable within the casing. The antenna system includes a mechanism for electrically connecting the displaceable antenna to internal RF circuitry of the portable WCD when the displaceable antenna is in an extended position and for electrically isolating the displaceable antenna from the internal RF circuitry when the displaceable antenna is in a retracted position within the casing.

Description

BRIEF DESCRIPTION OF THE FIGURES

The foregoing and other features and advantages of the invention will be apparent from the following, more particular description of the preferred embodiments of the invention, as illustrated in the accompanying drawings.

FIG. 1A is a diagram of a first embodiment of a hybrid antenna system in a WCD, wherein a whip antenna is depicted in an extended operative position.

FIG. 1B is a diagram of the hybrid antenna system of FIG. 1A, wherein the whip antenna is depicted in the retracted, inoperative position.

FIG. 2A is a diagram of a second embodiment of a hybrid antenna system for a WCD, wherein a whip antenna is depicted in an extended operative position, and an internal antenna is depicted in an inoperative state.

FIG. 2B is a diagram of the hybrid antenna system of FIG. 2A, wherein the whip antenna is depicted in a retracted inoperative position, and the internal antenna is depicted in an operative state.

FIG. 3 is a diagram of an alternative arrangement of the hybrid antenna system of the second embodiment, wherein an electronic switch switches between a whip antenna and an internal antenna, according to the present invention.

FIG. 4 is a functional diagram of the electronic switch of FIG.

3.

Claims

1. A portable communications device (PCD) having an internal antenna and a displaceable antenna connected to a common internal RF circuitry, the internal and displaceable antennas being simultaneously operatively electrically coupled in parallel to the common internal RF circuitry so as to maximize signal gain when the displaceable antenna is not in a retracted position, while when the displaceable antenna is retracted, only the internal antenna is operatively electrically coupled to the common internal RF circuitry.

2. The PCD of claim 1, further including a switching circuit for electrically isolating the internal antenna from common internal RF circuitry when a predetermined impedance in the displaceable antenna is detected.

3. The PCD of claim 1, further comprising a printed circuit board (PCB) on which components of the common internal RF circuitry are formed and which includes the internal antenna.

4. The PCD of claim 1, wherein the internal antenna is a shielded substrate antenna comprised of an electrically conductive trace formed on a printed circuit board fixed to and within a casing of the PCD.