Method and system for generating a balanced feed for RF circuit

Details Method and system for generating a balanced feed for RF circuit Method and system for generating a balanced feed for RF circuit

2001-05-01

2003-05-20

Clinger, James (Department: 2821)

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

C343S7000MS

Reexamination Certificate

active

06567055

ABSTRACT:

FIELD OF THE INVENTION
The present invention generally relates to RF baluns, and more particularly relates to transforming an unbalanced microstrip transmission line into a balanced printed parallel transmission line, and even more particularly relates to printed circuit methods and systems for providing a balanced feed for an RF circuit without the need for external components.
BACKGROUND OF THE INVENTION
In recent years, the popularity of radio communications has continued to increase. With more demand for radio equipment, the competition between manufacturers and suppliers of radio communication equipment can likewise be expected to increase. Areas in which these suppliers may be expected to compete would be on the size, price and durability of such equipment.
Numerous electronic devices use baluns to generate a balanced feed from an unbalanced source. One example is a typical global positioning system receiver. In such receivers, it is common to see a packaged discrete balun disposed between a GPS antenna and a receiver.
While these discrete baluns have been used extensively in the past, they do have some drawbacks. First of all, these discrete baluns add expense to the radio. Secondly, these baluns, and often their associated structures, increase the bulk of the radio. Lastly, these discrete baluns may have some electrical performance problems owing to packaging and interconnect parasitics.
Consequently, there exists a need for improved methods and systems for generating a balanced feed for RF circuits in an efficient manner.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a system and method for generating a balanced feed for an RF circuit in an efficient manner.
It is a feature of the present invention to utilize a balun integrated with a printed circuit board.
It is another feature of the present invention to include a pair of vertically aligned microstrip traces disposed on opposing sides of a printed circuit board.
It is another feature of the present invention to have a printed dipole antenna coupled to the balun of the present invention.
It is an advantage of the present invention to achieve improved efficiency in generating a balanced feed for RF circuits.
The present invention is an apparatus and method for balancing an RF feed, which is designed to satisfy the aforementioned needs, provide the previously stated objects, include the above-listed features, and achieve the already articulated advantages. The present invention is carried out in a “discrete balun-less” manner in a sense that the requirement for a discrete balun circuit between an antenna and a radio has been eliminated or greatly reduced.
Accordingly, the present invention is a system and method including a printed circuit card having a balun printed thereon, which includes two microstrip traces on opposing sides of the printed circuit boards.


REFERENCES:
patent: 5021799 (1991-06-01), Kobus et al.
patent: 6337666 (2002-01-01), Bishop

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