Communications: radio wave antennas – Antennas – Microstrip
Patent
1998-01-09
2000-10-17
Ho, Tan
Communications: radio wave antennas
Antennas
Microstrip
343771, 333 24C, H01Q 138
Patent
active
06133877&
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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Johannisson Bjorn
Sandstedt Jonas
Snygg Goran
Ho Tan
Telefonaktiebolaget LM Ericsson
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