Microstrip distribution network device for antennas
First Claim
1. Device for microstrip distribution networks for group antennas where the microstrip distribution network distributes and combines at least one electromagnetic signal within a predetermined frequency band and comprises a ground plane on a first surface and a distribution network with at least one separate branch on a second surface, where the first surface and the second surface are divided by a dielectric and substantially equidistant from each other, whereby at least two feed points transfer the electromagnetic signals between the distribution network and a group antenna'"'"'s antenna elements through the ground plane, the device comprising a waveguide substructure arranged in association with the microstrip distribution network and forming part of a waveguide structure where the waveguide structure is dimensioned so that it has a cut-off frequency that is higher than a frequency in the predetermined frequency band for the suppression of unwanted modes generated by the group antenna and by discontinuities in the distribution network.
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Accused Products
Abstract
A device for microstrip distribution networks and for group antennas for the suppression of unwanted modes on the distribution network side of a microstrip distribution network. This thereby avoids, among other things, unwanted coupling between antenna elements connected to the microstrip distribution network. A waveguide substructure in principle designed as a U of extruded aluminium, is connected to the microstrip distribution network along two connection lines with at least two electrically-conductive connections to the ground plane of the microstrip distribution network along each connection line. Together with at least part of the ground plane, the waveguide substructure forms a waveguide structure. The waveguide structure is dimensioned so that it has a cut-off frequency that is higher than the highest frequency that is used in the microstrip distribution network. This suppresses unwanted modes generated by the group antenna and by discontinuities in the distribution network as the waveguide structure acts as a high-pass filter.
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Citations
30 Claims
- 1. Device for microstrip distribution networks for group antennas where the microstrip distribution network distributes and combines at least one electromagnetic signal within a predetermined frequency band and comprises a ground plane on a first surface and a distribution network with at least one separate branch on a second surface, where the first surface and the second surface are divided by a dielectric and substantially equidistant from each other, whereby at least two feed points transfer the electromagnetic signals between the distribution network and a group antenna'"'"'s antenna elements through the ground plane, the device comprising a waveguide substructure arranged in association with the microstrip distribution network and forming part of a waveguide structure where the waveguide structure is dimensioned so that it has a cut-off frequency that is higher than a frequency in the predetermined frequency band for the suppression of unwanted modes generated by the group antenna and by discontinuities in the distribution network.
- 16. Group antenna comprising at least two antenna elements and a microstrip distribution network that distributes and combines electromagnetic signals within a predetermined frequency band and that comprises a ground plane on a first surface and a distribution network on a second surface, where the first surface and the second surface are divided by a dielectric and substantially equidistant from each other, whereby at least two feed points transfer the electromagnetic signals between the distribution network and antenna elements through the ground plane, and a waveguide substructure arranged in association with the microstrip distribution network and forming part of a waveguide structure where the waveguide structure is dimensioned so that it has a cut-off frequency that is higher than a frequency in the predetermined frequency band for the suppression of unwanted modes generated by the group antenna in order to thereby avoid unwanted coupling between antenna elements.
Specification