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Antenna

A passive antenna and antenna element technology, applied to antennas, devices that enable antennas to work in different bands at the same time, electrical components, etc., can solve problems such as large arrays

Inactive Publication Date: 2010-02-03
ITI SCOTLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although traveling wave elements can be selected to provide the wide bandwidth required, arrays of such elements are relatively large

Method used

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Examples

Experimental program
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Embodiment Construction

[0024] figure 2 An antenna array 10 is shown. The antenna array comprises a ground plane 11 with an omnidirectional central radiating element 12 . The omnidirectional central radiating element 12 is surrounded by a plurality of passive elements 14, eg arranged in a circular array. Although the central radiating element 12 is omnidirectional, those skilled in the art will recognize that by appropriately biasing the passive elements 14, the energy emitted by the central radiating element 12 can be directed to a particular sector.

[0025] Biasing is accomplished through a switch 16 at the bottom of each passive element 14 .

[0026] image 3 One of the passive elements 14 is shown in more detail.

[0027] Passive components 14 include a monopole antenna 18 on a printed circuit board (PCB). The monopole antenna 18 is electrically connected to the ground plane 11 of the antenna array via a switch 16 (eg, a PIN diode). PIN diode 16 is controlled by the application of control...

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PUM

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Abstract

A parasitic antenna element (20) comprises first and second switches: one at the base (PIN diode 22) and one approximately half way along the parasitic element (PIN diode 28). The lower half of the parasitic element is realized as a coplanar waveguide with a central conductor (32). This not only provides a convenient method for biasing the second PIN diode (28), but the outer conductors (24, 26) provide shielding and reduce coupling of the RF energy into the bias circuitry. The first switch located near the base of the antenna element is provided for selectively coupling the antenna element toa ground plane for quenching a first current mode. The second switch located along the antenna element selectively partitions the antenna element into first and second portions, thereby quenching higher order current modes.

Description

technical field [0001] The present invention relates to an antenna, such as an ultra-wideband antenna, and in particular a parasitic antenna element for use in an antenna. Background technique [0002] Ultra-wideband (UWB for short) is a radio technology for transmitting digital data across a very wide frequency band (3.1GHz to 10.6GHz). It utilizes ultra-low transmission power, generally less than -41dBm / MHz, so this technology can be completely hidden under other transmission frequencies (such as existing Wi-Fi, GSM and Bluetooth). This means UWB can coexist with other RF technologies. However, this has the limitation of limiting communication to distances of typically 5 to 20 meters. [0003] There are two approaches to UWB: a time-domain approach, which constructs a signal from a pulse waveform with UWB characteristics, and a frequency-domain modulation approach, which uses conventional FFT-based Orthogonal Frequency Division Multiplexing over multiple (frequency) band...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q19/22H01Q19/28H01Q5/15
CPCH01Q19/28H01Q19/22H01Q3/446H01Q19/32H01Q3/24
Inventor 尼尔·威廉姆斯迈克尔·菲利浦裴科斯迪恩·肯普
Owner ITI SCOTLAND