Dielectric resonator antenna
First Claim
1. A dielectric resonator antenna comprising a dielectric resonator having a substantially planar longitudinal surface and a grounded substrate having first and second opposed surfaces with a dielectric substrate adjacent to the second surface, wherein:
- i) the grounded substrate includes a slot extending longitudinally in a first direction and having a predetermined width;
ii) the dielectric resonator is arranged such that its longitudinal surface is disposed close to the first surface of the grounded substrate with a gap between the surfaces, and with an end region of the longitudinal surface overlying the width of the slot;
iii) a majority of the longitudinal surface of the dielectric resonator is provided with a conductive layer, the end region of the longitudinal surface being free of the conductive layer; and
iv) a strip feed line is provided on the dielectric substrate on the second surface of the grounded substrate, the strip feed line being substantially coextensive with the longitudinal surface of the dielectric resonator and extending beyond the width of the slot in the grounded substrate.
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Accused Products
Abstract
There is disclosed a dielectric resonator antenna adapted to resonate in an EH11δ resonance mode, and also a method for the manufacture thereof. The desired resonance mode is achieved by careful positioning of a dielectric resonator (2) on a grounded substrate (1), the resonator (2) being fed by way of a microstrip feed line (9) and a slot (6) in the grounded substrate (1). Because the EH11δ resonance mode has nulls in a direction of longitudinal extension of the dielectric resonator (2), a plurality of antenna can be placed end-to-end so as to form an array with reduced coupling between adjacent antennas and with vertical polarisation, which is desirable for mobile communications applications.
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Citations
29 Claims
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1. A dielectric resonator antenna comprising a dielectric resonator having a substantially planar longitudinal surface and a grounded substrate having first and second opposed surfaces with a dielectric substrate adjacent to the second surface, wherein:
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i) the grounded substrate includes a slot extending longitudinally in a first direction and having a predetermined width; ii) the dielectric resonator is arranged such that its longitudinal surface is disposed close to the first surface of the grounded substrate with a gap between the surfaces, and with an end region of the longitudinal surface overlying the width of the slot; iii) a majority of the longitudinal surface of the dielectric resonator is provided with a conductive layer, the end region of the longitudinal surface being free of the conductive layer; and iv) a strip feed line is provided on the dielectric substrate on the second surface of the grounded substrate, the strip feed line being substantially coextensive with the longitudinal surface of the dielectric resonator and extending beyond the width of the slot in the grounded substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of manufacturing a dielectric resonator antenna the antenna comprising a dielectric resonator having a substantially planar longitudinal surface and a grounded substrate having first and second opposed surfaces with a dielectric substrate adjacent to the second surface, the method comprising:
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forming a slot in the grounded substrate, the slot extending longitudinally in a first direction and having a predetermined width; providing a strip feed line on the dielectric substrate on the second surface of the grounded substrate, the strip feed line being generally perpendicular to the slot in the grounded substrate and having one end that extends beyond the width of the slot; coating a conductive layer onto a majority of the longitudinal surface of the dielectric resonator, leaving an end region of the longitudinal surface free of the conductive layer; arranging the dielectric resonator such that its longitudinal surface is disposed close to the first surface of the grounded substrate with a gap between the surfaces, and with the end region of the longitudinal surface overlying the width of the slot; connecting the dielectric resonator to a resonance analyser and moving the dielectric resonator about over the first surface of the grounded substrate until a resonance position is found where a predetermined resonance mode is detected by the resonance analyser; adhering the longitudinal surface of the dielectric resonator to the first surface of the grounded substrate in the resonance position with an adhesive laden with a conductive material; and trimming the end of the strip feed line extending beyond the slot in the grounded substrate until the predetermined resonance mode measured by the resonance analyser predominates over other possible resonance modes. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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- 23. A dielectric resonator antenna comprising a dielectric resonator having a substantially planar longitudinal surface, a dielectric substrate having first and second opposed surfaces with a conductive groundplane being provided on the second surface and a direct microstrip feedline being provided on the first surface so as to extend longitudinally therealong, the dielectric resonator being mounted on the first surface such that the planar longitudinal surface of the dielectric resonator contacts the direct microstrip feedeline and is coextensive therewith, wherein substantially all of the longitudinal planar surface of the dielectric resonator is provided with a conductive layer.
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28. A dielectric resonator antenna comprising a dielectric resonator having a substantially planar longitudinal surface, a dielectric substrate having first and second opposed surfaces with a conductive groundplane being provided on the second surface and a direct microstrip feedline being provided on the first surface so as to extend longitudinally therealong, the dielectric resonator being mounted on the first surface such that the planar longitudinal surface of the dielectric resonator contacts the direct microstrip feedline and is coextensive therewith, wherein the antenna resonates in an EH mode during operation thereof.
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29. A dielectric resonator antenna comprising a dielectric resonator having a substantially planar longitudinal surface, a dielectric substrate having first and second opposed surfaces with a conductive groundplane being provided on the second surface and a direct microstrip feedline being provided on the first surface so as to extend longitudinally therealong, the dielectric resonator being mounted on the first surface such that the planar longitudinal surface of the dielectric resonator contacts the direct microstrip feedline and is coextensive therewith, wherein only a part of the longitudinal planar surface of the dielectric resonator that contacts the direct microstrip feedline is provided with a conductive layer.
Specification