1. Field of the Invention
This invention relates in general to antennas for receiving and/or transmitting radio waves, and in particular, to an improved antenna for a portable receiver or transceiver.
2. Description of Related Art
For a handheld or portable radio receiver or transceiver, it is desirable to have a telescoping antenna that can be adjusted for best performance over a particular frequency range. For some configurations, it is not practical to cover all antenna lengths that might be needed with a single telescoping antenna mechanism. For example, shortwave radio frequencies can require an antenna many feet long for adequate reception. A telescoping antenna of such length is not typically practical or desirable on a portable device.
The novel features believed characteristic of the invention are set forth in the appended claims. However, the invention itself, as well as a preferred mode of use, and further objectives and advantages thereof, will best be understood by reference to the following detailed description when read in conjunction with the accompanying drawings, wherein:
Prior telescoping antennas typically are made up of one or more hollow elements with a single solid element as the inner-most (smallest diameter) extension piece. A “button” at the top end of the inner-most element prevents the last extension piece from being retracted too far into the hollow elements, and also provides a convenient point for grasping the antenna during extension. The antenna of the present disclosure replaces the inner-most solid element with an inner-most hollow element as the last element. A button latches onto the top of the last element. The last element also can include a tab for preventing its full retraction into the other hollow elements. A wire antenna element is connected to the button, extends through the hollow elements, and is operably connected to a retracting mechanism. The button can be detached from the hollow elements in order to extend the wire antenna elements from out of the hollow elements. The wire antenna element is electrically connected to the receiver circuit such that the wire can act as a long-wire antenna of a calculable radio frequency (RF) resonance when extracted to a particular length.
Referring to
A portion of the wire antenna element 106 is wound around a spool 108. The spool 108 is rotatable to allow the wire antenna element 106 to be unwound from the spool 108 to an extended position. A retracting mechanism 110 controls the spool 108 to wind the wire antenna element 106 back on the spool 108, thereby retracting the wire antenna element 106 from an extended position.
The wire antenna element 106 extends from the spool 108, through a plurality of elongated, rigid telescoping tubes 112 and attaches to a button 116. The telescoping tubes 112 include an outermost tube 112a and an innermost tube 112b. The outermost tube 112a is secured to the housing 102, for example using hardware and/or adhesive. The telescoping tubes 112 have aligned longitudinal axes and successively decreasing transverse dimensions to permit each of the tubes 112 to axially slide therebetween. The telescoping tubes 112 are also hollow to permit the wire antenna element 106 to pass through the inside of the tubes 112. Note that in
In some embodiments, the tubes 112 can be conductive. In such embodiments, the tubes 112 can be formed of metal, for example stainless steel or chrome-plated bronze. In such embodiments, the tubes 112 can be conductively connected to each other and to the wire antenna element 106.
In other embodiments, the tubes 112 can be RF transparent. In such embodiments, the tubes 112 can be formed of a plastic or polymer material.
A tab 118 is attached to the innermost tube 112b and serves as a down-stop for preventing the innermost tube 112b from sliding too far down into the other tubes 112.
Referring next to
Note that, in addition to an innermost tube 112b and an outermost tube 112a, the plurality of tubes 112 also includes an intermediate tube 112c. While the illustrated embodiment includes three tubes 112a-112c, alternative embodiments can include any number of tubes 112.
Referring next to
Referring next to
The antenna assembly 200 includes a housing 202 having a connector 203 for operably and detachably connecting the antenna assembly 200 to a radio 222. For example, the connector 203 can be a conventional RF connector such as conventional bayonet-mount fastening mechanism, for example a BNC (bayonet Neill-Concelman) connector. In some embodiments the connector 203 can be mounted directly onto the housing 202, while in alternative embodiments the connector 203 can be connected to the housing via a conductor, such as a coaxial cable or the like, thereby allowing the antenna assembly 200 to be located some distance from the radio 222. The antenna assembly 200 includes a flexible wire antenna element 206 that is electrically connected to the connector 203 such that, when the connector 203 is connected to the radio 222, the wire antenna element 206 can serve as an antenna for the receiver and/or transmitter of the radio 222. The flexible wire antenna element 206 can be, for example, bare copper wire, insulated copper wire, bare or insulated copper alloy wire, or bare or insulated wire formed of some other material suitable for use as a wire antenna.
A portion of the wire antenna element 206 is wound around a spool 208. The spool 208 is rotatable to allow the wire antenna element 206 to be unwound from the spool 208 to an extended position. A retracting mechanism 210 controls the spool 208 to wind the wire antenna element 206 back on the spool 208, thereby retracting the wire antenna element 206 from an extended position. There are a number of different ways in which the retracting mechanism 210 can be implemented. For example, the retracting mechanism 210 can include a hand-crank for allowing a user to manually retract the wire antenna element 206; the retracting mechanism 210 can include a spring and latch mechanism, for example where a spring urges the spool 208 to retract the wire antenna element, and a user-releasable latch allows the wire antenna element 206 to remain retracted against the force of the spring; the retracting mechanism 210 can include a user-controlled motor for driving the spool 208 to retract the wire antenna element; and/or the retracting mechanism 210 can include any combination of these types of mechanisms. Any other known retracting means can additionally or alternatively be used as the retracting mechanism 210.
The wire antenna element 206 extends from the spool 208, through a plurality of elongated, rigid telescoping tubes 212 and attaches to a button 216. The telescoping tubes 212 include an outermost tube 212a and an innermost tube 212b. The outermost tube 212a is secured to the housing 202, for example using hardware and/or adhesive. The telescoping tubes 212 have aligned longitudinal axes and successively decreasing transverse dimensions to permit each of the tubes 212 to axially slide therebetween. The telescoping tubes 212 are also hollow to permit the wire antenna element 206 to pass through the inside of the tubes 212. Note that in
In some embodiments, the tubes 212 can be conductive. In such embodiments, the tubes 212 can be formed of metal, for example stainless steel or chrome-plated bronze. In such embodiments, the tubes 212 can be conductively connected to each other and to the wire antenna element 206.
In other embodiments, the tubes 212 can be RF transparent. In such embodiments, the tubes 212 can be formed of a plastic or polymer material.
A tab 218 is attached to the innermost tube 212b and serves as a down-stop for preventing the innermost tube 212b from sliding too far down into the other tubes 212.
The antenna assembly 200 is shown with the tubes 212 extended, but the tubes 212 can be retracted just as the tubes 112 are retracted in
Note that, in addition to an innermost tube 212b and an outermost tube 212a, the plurality of tubes 212 also includes an intermediate tube 212c. While the illustrated embodiment includes three tubes 212a-212c, alternative embodiments can include any number of tubes 212.
The antenna assembly 200 is shown with the tubes 212 extended and the wire antenna element 206 extended from out of the innermost tube 212b. The button 216 is detachable from the innermost tube 216. The button 216 can be configured to snap, twist, and/or screw onto the innermost tube 212b. For example, the button 216 can be configured to attach to the innermost tube 212b via a conventional bayonet-mount fastening mechanism. Alternatively, the button 216 can be attached to the innermost tube 212b via a spring-latch mechanism that requires a user to press a latch in order to release the button 216 from the innermost tube 212b. Once the button 216 is detached from the innermost tube 212b, the button 216 can be pulled in order to extract a portion of the wire antenna element 106 as shown. Depending on the size and material of the wire antenna element 206, the wire antenna element 206 may be more or less rigid. In some embodiments, the wire antenna element 206 can be flexible enough that it limply hangs from the upper end of the innermost tube 212b (the end of the innermost tube 212b from which the wire antenna element exits the tubes 212).
It is apparent that an invention with significant advantages has been described and illustrated. Although the present invention is shown in a limited number of forms, it is not limited to just these forms, but is amenable to various changes and modifications without departing from the spirit thereof.
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Number | Date | Country | |
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20090046032 A1 | Feb 2009 | US |