Antenna arrangement
First Claim
1. A radio frequency antenna arrangement for selective operation at orthogonal polarisations of electromagnetic radiation, comprising;
- a first housing for housing;
at least one radiating element each having a vertical polarisation feed point and a horizontal polarisation feed point,a vertical feeder circuit for coupling a radio frequency modulated electromagnetic signal to the vertical polarisation feed point of the or each radiating element, anda horizontal feeder circuit for coupling a radio frequency modulated electromagnetic signal to the horizontal polarisation feed point of the or each radiating element,a second housing for housing;
a terminating resistive load, anda connection to the modulated electromagnetic signal, anda switch mechanism comprising a mechanically selectable electrical connection between the first housing and the second housing for selectively coupling the electromagnetic signal to one of the horizontal feeder circuit or the vertical feeder circuit and for selectively coupling the load to the other of the horizontal feeder circuit or the vertical feeder circuit.
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Accused Products
Abstract
A radio frequency antenna arrangement for selective operation at orthogonal polarizations of electromagnetic radiation. The antenna arrangement comprises at least one radiating element, such as one or more antenna patches, each having a vertical polarization feed point and a horizontal polarization feed point. The arrangement also includes a vertical feeder circuit for coupling a radio frequency modulated electromagnetic signal to the vertical polarization feed point of the or each radiating element, a horizontal feeder circuit for coupling a radio frequency modulated electromagnetic signal to the horizontal polarization feed point of the or each radiating element and a terminating resistive load. A switch mechanism is provided for selectively coupling the electromagnetic signal to one of the horizontal feeder circuit or the vertical feeder circuit and for selectively coupling the load to the other of the horizontal feeder circuit or the vertical feeder circuit. In the first position of the switch the electromagnetic signal is coupled to the horizontal feeder circuit and the resistive load is coupled to the vertical feeder circuit and the antenna arrangement operates predominantly in the horizontal polarization. In the second position of the switch the electromagnetic signal is coupled to the vertical feeder circuit and the resistive load is coupled to the horizontal feeder circuit and the antenna arrangement operates predominantly in the vertical polarization. In a first embodiments of the invention the switch mechanism is located at the interface between two antenna housing parts and the required polarization is selected by mechanical alignment of the housing parts relative to each other. In a second embodiment of the invention the switch mechanism is integrated onto the feeder circuits.
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Citations
16 Claims
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1. A radio frequency antenna arrangement for selective operation at orthogonal polarisations of electromagnetic radiation, comprising;
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a first housing for housing; at least one radiating element each having a vertical polarisation feed point and a horizontal polarisation feed point, a vertical feeder circuit for coupling a radio frequency modulated electromagnetic signal to the vertical polarisation feed point of the or each radiating element, and a horizontal feeder circuit for coupling a radio frequency modulated electromagnetic signal to the horizontal polarisation feed point of the or each radiating element, a second housing for housing; a terminating resistive load, and a connection to the modulated electromagnetic signal, and a switch mechanism comprising a mechanically selectable electrical connection between the first housing and the second housing for selectively coupling the electromagnetic signal to one of the horizontal feeder circuit or the vertical feeder circuit and for selectively coupling the load to the other of the horizontal feeder circuit or the vertical feeder circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A radio frequency antenna arrangement for selective operation at orthogonal polarisations of electromagnetic radiation, comprising;
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at least one radiating element each having a vertical polarisation feed point and a horizontal polarisation feed point, a vertical feeder circuit for coupling a radio frequency modulated electromagnetic signal to the vertical polarisation feed point of the or each radiating element, a horizontal feeder circuit for coupling a radio frequency modulated electromagnetic signal to the horizontal polarisation feed point of the or each radiating element, a terminating resistive load, and a switch mechanism which is integrated into the feeder circuits for selectively coupling the electromagnetic signal to one of the horizontal feeder circuit or the vertical feeder circuit and for selectively coupling the load to the other of the horizontal feeder circuit or the vertical feeder circuit. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for switching the polarisation of an antenna arrangement between two orthogonal polarisations, which antenna arrangement comprises;
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a first housing for housing; at least one radiating element each having a vertical polarisation feed point and a horizontal polarisation feed point, a vertical feeder circuit for coupling a radio frequency modulated electromagnetic signal to the vertical polarisation feed point of the or each radiating element, and a horizontal feeder circuit for coupling a radio frequency modulated electromagnetic signal to the horizontal polarisation feed point of the or each radiating element, a second housing for housing; a terminating resistive load, and a connection to the modulated electromagnetic signal, and said method comprising the steps of; mechanically selecting an electrical connection between the first housing and the second housing for selectively coupling the electromagnetic signal to one of the horizontal feeder circuit or the vertical feeder circuit and for selectively coupling the load to the other of the horizontal feeder circuit or the vertical feeder circuit. - View Dependent Claims (15, 16)
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Specification