Communications: radio wave antennas – Antennas – Combined
Reexamination Certificate
2000-01-27
2001-04-17
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
Combined
C343S702000, C343S895000, C029S600000
Reexamination Certificate
active
06219008
ABSTRACT:
TECHNICAL FIELD
The present invention relates, in general, to an antenna connector for radio communication equipment and, more particularly, to an antenna connector provided with an impedance transformer having a flat cutout portion, the connector being also designed to control the bandwidth of an antenna in accordance with the length of the antenna and the number of turns of the antenna, or a helical antenna, fitted over the impedance transformer and to allow the bandwidth of the antenna to be easily and simply controlled as desired.
BACKGROUND ART
As well known to those skilled in the art, the signal feed structure of conventional small-sized antennas for radio communication equipment has been designed in that a signal is directly fed to a coaxial line. Such a signal feed structure includes two types: a monopole type wherein a signal is fed to the plus portion of a coaxial line, and a dipole type wherein a signal is fed to both the plus and minus portions of a coaxial line.
However, the above-mentioned signal feed structure for antennas is problematic in that it results in an unbalance between signal feed lines of an antenna, thus practically making it difficult to match the impedance of the antenna. Such a signal feed structure also causes the contact portions between the antenna and the signal feed lines to be frequently changed, thus allowing the characteristics of the antenna to be undesirably changed. This results in a reduction in the antenna efficiency.
FIG. 4
shows the construction of a conventional wide-band helical antenna disclosed in U.S. Pat. No. 4,772,895. The above wide-band helical antenna is designed to broaden frequency response and comprises a feed port including a signal feed portion and a ground portion. The above antenna also comprises two helically configured conductive elements: first and second elements
200
and
400
. The first element
200
has opposite ends, and exhibits a first pitch and a first electrical length. One end of the first element
200
is coupled to the signal feed portion of the feed port. On the other hand, the second element
400
has opposite ends, and exhibits a second pitch and a second electrical length. The second element
400
is coaxially wound around a portion of the first element. One end of the second element
400
is coupled to the ground portion of the feed port. The second pitch is equal to approximately one half of the first pitch, while the second electrical length is equal to approximately one third of the first electrical length. The above antenna further comprises a cylindrical spacer means
300
. The above spacer means
300
is coaxially situated between the first and second elements
200
and
400
, thus electrically insulating the two elements
200
and
400
. The spacer means
300
is also sufficiently thin such that the first element is tightly coupled to the second element so as to broaden the frequency response exhibited by the first element.
In the above wide-band helical antenna, the spacer means, coaxially situated between the first and second helical elements positioned inside and outside of the antenna respectively, is used as a contact means for allowing the two elements to be coupled together. However, the above antenna is not designed to overcome the unbalance between the signal feed lines experienced in conventional antennas, thereby reducing the antenna efficiency. Another problem associated with the above wide-band helical antenna resides in that it is almost impossible to make a small-sized antenna.
DISCLOSURE OF THE INVENTION
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an antenna connector for radio communication equipment, which converts the conventional parallel resonance of an antenna into a series resonance by forming a flat cutout portion on its impedance transformer, or the signal feed part for the antenna, without changing the characteristics of the antenna, thus broadening the bandwidth of the antenna, and which easily and simply controls the bandwidth of the antenna as desired by changing the size and height of the impedance transformer, by changing the surface area of the cutout portion of the impedance transformer, or by changing the number of turns of the antenna, or a helical antenna, fitted over the impedance transformer.
Another object of the present invention is to provide an antenna connector for radio communication equipment, which is effectively used at various frequencies, thus effectively and quickly meeting a variation of the central frequency of an antenna with the variation being caused by a change in environmental conditions of the antenna.
In order to accomplish the above objects, the present invention provides an antenna connector for radio communication equipment, comprising opposite ends, one end of the connector being brought into contact with an antenna and forming an impedance transformer part, and the other end engaging with the radio communication equipment, wherein the impedance transformer part comprises one or more impedance transformers, at least one of the impedance transformers being cut along a central axis thereof, thus having a flat cutout portion. In the above antenna connector, one or more flat cutout portions may be partially or totally formed on the impedance transformer. A longitudinal groove may be axially formed along a central axis on each flat cutout portion of the impedance transformer. In addition, two or more flat cutout portions may be formed on the impedance transformer along the central axis of the impedance transformer while being spaced out at regular intervals. The above impedance transformer may be separated from a locking boss of the connector, with a coiled conductive wire being positioned between the impedance transformer and the locking boss so as to electrically connect the impedance transformer to the locking boss. In the above antenna connector, two flat cutout portions may be formed on the impedance transformer in a way such that the two cutout portions are positioned at opposite sides of one middle wall.
REFERENCES:
patent: 4772895 (1988-09-01), Garay et al.
patent: 5218372 (1993-06-01), Cheng
patent: 5274393 (1993-12-01), Scott
patent: 5742259 (1998-04-01), Annamaa
Ryou Byunghoon
Sung Weonmo
McGuireWoods LLP
Phan Tho
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