Highly isolated dual compact stacked spiral antenna

Details Highly isolated dual compact stacked spiral antenna Highly isolated dual compact stacked spiral antenna

2000-05-23

2001-10-09

Ho, Tan (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S821000

Reexamination Certificate

active

06300919

ABSTRACT:

BACKGROUND OF THE INVENTION
Antennas having the capability of multiple frequency band operation are known in the art. It is desirable to provide isolation between the multiple frequency bands. Conventionally this is done by filtering the bands by filters outside the antenna body, which requires added hardware and space.
It is known to use a spiral antenna for one band, with other spiral antennas placed at the edges of larger spirals. The outer spiral is generally quite small and therefore must operate at a significantly different and higher frequency. If the spirals are close to the same frequency, they take up much more space and are therefore not a compact structure.
Generally, antennas that are spaced close to each other have considerable coupling which reduces the antennas's ability to separate out signals.
SUMMARY OF THE INVENTION
According to one aspect of the invention, an antenna is described which includes a plurality of antennas stacked on top of each other in a compact cavity. Input match and radiation gain can be enhanced by the application of a capacitor and inductor in the feed of the spiral lowest in the cavity. The antenna can fit into a very compact space while providing circular polarization over the desired bands of the antennas that are isolated.


REFERENCES:
patent: 3686674 (1972-08-01), Clasby et al.
patent: 4797684 (1989-01-01), Bernstein et al.
patent: 5936594 (1999-08-01), Yu et al.
patent: 5990849 (1999-11-01), Salvail et al.

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