Q equalization in dual-element end-fire array antennas
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United States of America Patent
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Nov 29, 1994
Grant Date -
N/A
app pub date -
Jul 2, 1993
filing date -
Jul 2, 1993
priority date (Note) -
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Abstract
Mutual coupling effects, which would tend to degrade operation of a two-element end-fire array over a frequency band, are overcome by provision of an inter-element coupling impedance which is effective to equalize the Q at the inputs to the quadrature-excited elements. A quarter-wave transmission line section is coupled between the inputs to provide such impedance, which has a value selected to offset the effect of mutual coupling on Q. For a pair of monopoles, the inter-element coupling line is connected to the respective monopoles by quarter-wave sections having impedances selected in order to provide desired input impedances. The performance of dual-element end-fire slot or dipole array antennas may similarly be improved. Linear array antennas of four or more elements are provided by forced feeding of the additional elements from the basic dual-element configuration in accordance with the invention.
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