Method and arrangement for improving null depths

Details Method and arrangement for improving null depths Method and arrangement for improving null depths

1999-09-29

2001-05-22

Tarcza, Thomas H. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including polarized signal communication transmitter or...

Reexamination Certificate

active

06236364

ABSTRACT:

TECHNICAL FIELD
The invention relates generally to radiation suppression and, more specifically, to a method and an arrangement for improving null depths in antenna patterns.
BACKGROUND
In systems such as mobile communication systems, radar systems etc., it is sometimes of interest to suppress radiation of signal power in certain directions. The reason for doing this in e.g. a mobile communication system is typically to reduce interference and, thus, improve system performance.
A typical property of an antenna is that, in the main lobe direction, crosspolar components are significantly suppressed in comparison with copolar components, whereas, in side lobe directions, the crosspolar components may be of the same magnitude as the copolar components. This means that when a null is formed in a certain direction or angular region on the basis of the copolar components, the depth of that null will be limited by the crosspolar components.
SUMMARY
The object of the invention is to eliminate the limitation of the null depth caused by the crosspolar components.
This is generally attained in accordance with the invention by further attenuating the crosspolar components in the direction or region where nulls are desired.
Hereby, the crosspolar components will not limit the null depth.


REFERENCES:
patent: 4233607 (1980-11-01), Sanford et al.
patent: 4335388 (1982-06-01), Scott et al.
patent: 4623891 (1986-11-01), Johnson
patent: 4811023 (1989-03-01), Gelernter et al.
patent: 4-108201 (1992-04-01), None

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