Loop antenna assembly for telecommunication devices

Details Loop antenna assembly for telecommunication devices Loop antenna assembly for telecommunication devices

1999-04-22

2001-05-22

Le, Hoanganh (Department: 2821)

Communications: radio wave antennas

Antennas

With radio cabinet

C343S741000, C343S7000MS

Reexamination Certificate

active

06236368

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates generally to an antenna assembly, and more particularly to a loop antenna assembly for a hand-held radio frequency transceiver, such as a cellular telephone or PCS device operating in the 800-900 or 1850-1990 MHz. frequency ranges, respectively.
DESCRIPTION OF THE PRIOR ART
There has been a recognized need for a compact antenna assembly for a hand-held radio frequency transceiver which offers increased performance in gain and front-to-back ratio at given input power levels. It is recognized that prior art monopole antennae, while providing good radiation characteristics and desirable drive point impedance, may be more subject to damage than a compact antenna protected within the interior of the transceiver housing.
Performance limitations of many other prior antennas for radio frequency transceivers have included limited signal range, limited directionality, significant radio frequency radiation output to the user, and significant multipath interference.
SUMMARY OF THE INVENTION
A compact loop directive antenna having improved front-to-back ratio and gain for given input power levels is provided by the present invention. Such a compact antenna would replace the popular monopole or whip-style antennas in current use and may be installed within the interior of the transceiver. The loop antenna assembly consists of a main loop antenna conductor disposed upon a dielectric substrate element. The main loop antenna conductor and dielectric element are maintained a predetermined distance away from a ground plane, which may be defined by a portion of the circuit board or other conductive member of the transceiver. The main loop antenna conductor can be formed as either a closed loop or open loop and may include a variety of feedpoint orientations to provide alternative polarizations of the transmitted signal. The ground plane may be defined by a portion of the printed circuit board of the device, a conductive part of the device housing, the battery pack of the device, or a separate conductive panel. Several purposes and objects of the disclosed apparatusses are described herein. One object of the present disclosure is to provide a compact antenna assembly with improved directionality and gain at given input power levels
Additional improvements and benefits of the antenna assembly of the present invention include: increased signal strength resulting in extended signal range and fewer dropped calls for a given power consumption rate; an increased battery life for a given output signal level; reduced radio frequency radiation incident to the user's body; a reduction in the physical size of a directional antenna for use on a wireless device; and, protection of the antenna structure from external damage.
Accordingly, it is a primary object of the present invention to provide an improved compact antenna assembly for communication devices with improved directionality, broadband input impedance, increased signal strength, and increased battery life.
Other benefits include a reduction in multipath interference and increased front-to-back ratio.


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