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Cellular Antenna

a technology of cellular antennas and antenna details, applied in the field of antennas, can solve problems such as complex and expensive construction

Inactive Publication Date: 2008-08-07
COMMSCOPE INC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an antenna control system for adjusting the beam characteristics of an antenna in a land-based cellular communication system. The system includes an antenna with a plurality of radiating elements and a feed network for transmitting signals to and from the elements. The feed network includes downtilt phase shifting means for adjusting the angle of the antenna beam and power dividing means for adjusting the width of the beam. The system also includes a control means for adjusting the characteristic of the antenna beam in response to control data received from a remote control centre. The system can provide improved coverage and reduce interference with mobile devices.

Problems solved by technology

Such antennas have typically employed active switching elements and been of complex and expensive construction.

Method used

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  • Cellular Antenna
  • Cellular Antenna
  • Cellular Antenna

Examples

Experimental program
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Embodiment Construction

[0082]Referring to FIG. 1 an antenna 1 has an array of three radiating elements 2, 3, 4 arranged in a single row. FIG. 2 shows a schematic diagram of the feed network 5 from a connector 6 to the radiating elements 2, 3 and 4. Power divider 7 divides power between antennas 2 and 4 and antenna 3. Adjustment of power divider 7 results in variation of beam width of the beam of antenna 1.

[0083]Power divider 7 is shown in detail in FIG. 2A. A first hybrid coupler 71 has an input port 72 coupled to connector 6 and a port 73 which is isolated. The hybrid coupler 71 splits the input signal into two signals with equal amplitude which are output on lines 74, 75 with a phase difference of 90. The phase of the signal on line 75 can be adjusted by a phase shifter 79 which adjust the length L2 of line 75 compared to the length L1 of line 74. The lines 74, 75 are coupled to a second hybrid coupler 76 which splits and combines the signals with a 90 phase shift. When L1=L2 the signals interfere const...

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Abstract

An antenna for communicating with mobile devices in a land-based cellular communication system via an antenna beam having a width, azimuth angle and downtilt angle. The antenna includes: a two dimensional array of radiating elements (31-34); and a feed network (35-39) from a feed line to the radiating elements. The feed network includes: downtilt phase shifting means (35,36) for varying the phase of signals supplied to or received from the radiating elements so as to vary the downtilt angle of the antenna beam; azimuth phase shifting (38,39) means for varying the phase of signals supplied to or received from the radiating elements so as to vary the azimuth angle of the antenna beam; and beam width adjustment means (37) for varying the power or phase of signals supplied to or received from the radiating elements so as to vary the width of the antenna beam.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an antenna for communicating with mobile devices in a land-based cellular communication system. The invention also relates to an antenna system and a cellular communication system incorporating one or more antennas.BACKGROUND OF THE INVENTION[0002]Antennas used in early cellular base stations typically did not include means for varying antenna beam direction and had to be mounted to a support structure at an inclination required to provide a beam producing the required cell coverage. More recent antennas have included means for remotely adjusting downtilt of the beam of an antenna of a cellular base station. WO96 / 14670 discloses an antenna having mechanically adjustable phase shifters which produce variable electrical phase shifts in the feed path of the antenna to effect downtilting of the beam of an antenna.[0003]Phased array antennas, used in radar applications, provide both azimuth beam steering and vertical beam tilti...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01P1/18H01P5/12H01Q1/24H01Q3/24H01Q3/26H01Q3/36H01Q13/10H01Q21/06H01Q21/20H01Q21/22
CPCH01P1/18H01P5/04H01Q1/246H01Q3/24H01Q21/22H01Q3/32H01Q3/36H01Q21/061H01Q3/26
Inventor RHODES, DANIELGRAY, ANDREW THOMASROBERTS, ARTHUR GEORGEGRAHAM, PETER BRUCE
Owner COMMSCOPE INC