Patent Application
20070035453
The present invention relates generally to wireless communication. More specifically the present invention relates to compact wireless mobile units.
Cellular telephony has revolutionized personal communications. People are now able to enjoy ready access to voice and data networks. The continued phenomenal progress of electronics has encouraged development of smaller handheld wireless communication devices (“mobile units”) with increased functionality, e.g., music, video, and tactile simulation of base audio. Certain components of mobile units, such as antennas, displays, multifunction transducers, and hinge mechanisms do not continually scale down in size and consequently become limiting factors in efforts to maintain or reduce the size of mobile units while at the same time increase or maintain functionality. In as much as the wireless communication signals have a wavelength that is comparable to the size of mobile units, the antennas of the mobile units are very subject to disturbance by parts of the mobile units themselves. Given the trends toward higher functionality and smaller size mobile units, it is often necessary to place other internal parts of the mobile units close to the antenna. Placing other internal parts close to the antenna often leads to degraded antenna performance. It would be desirable to be able to provide an antenna system that performs well notwithstanding the close proximity of other parts of the mobile units.
The accompanying figures, where like reference numerals refer to identical or functionally similar elements throughout the separate views and which together with the detailed description below are incorporated in and form part of the specification, serve to further illustrate various embodiments and to explain various principles and advantages all in accordance with the present invention.
Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of embodiments of the present invention.
Before describing in detail embodiments that are in accordance with the present invention, it should be observed that the embodiments reside primarily in combinations and apparatus components related to wireless communication devices. Accordingly, the apparatus components have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.
In this document, relational terms such as first and second, top and bottom, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms “comprises,” “comprising,” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by “comprises . . . a” does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.
A flip 110 is pivotably coupled to the housing 102 using, a hinge detent mechanism 208 (
A first passive radiating element 126 that is described further below with reference to
A first tuning tab 221 extends from the third segment 224 of the letter U shaped part 214 proximate 226 toward the printed circuit board 202 (into the plane of the drawing sheet). A second tuning tab 402, a third tuning tab 404, a fourth tuning tab 317 and a fifth tuning tab 406 extend toward the printed circuit board and are arranged in sequence starting at the first free end 216 of the letter C shaped part 212. The tuning tabs 221, 402, 404, 317, 406 serve to effectively increase electrical lengths of the letter C shaped part 212 and the letter U shaped part 214 and lower operating frequencies to desired values for a high band (e.g., 1900 MHz) and a low frequency band (e.g., 850 MHz) of the antenna 204.
A signal feed conductor 230 and a grounding conductor 232 attach to the base segment 220. The signal feed conductor 230 and the grounding conductor 232 bend toward the printed circuit board 202. A dual frequency transceiver (not shown) is connected to the signal feed conductor 230. A ground plane 302 of the printed circuit board 202 is coupled to the grounding conductor 232. As such the ground plane 302 serves as a counterpoise for the antenna 204. An impedance match tuning tab 234 is disposed between the signal feed conductor 232 and the grounding conductor 232. Note that the antenna 204 is a variant of a type of antenna termed a Planar Inverted F Antenna (PIFA). The antenna 204 is also a dual band antenna. The letter U shaped part 214 of the antenna 204 is most strongly associated with operation in the high frequency band (e.g., 1900 MHz) and the letter C shaped part 212 of the antenna 204 is more strongly associated with operation in the low frequency band (e.g., 850 MHz).
The MFT 206 produces audio and vibrations in response to input electrical signals. The MFT 206 includes certain electrically conductive parts including a magnet-yoke assembly 304, a solenoid 306, and a spiral arm leaf spring 308. The MFT 206 also has electrical terminals 310 (one shown) for inputting electrical signals for driving the MFT 206. Within the MFT 206, the electrical terminals 310 are coupled to the solenoid 306. Externally, the electrical terminals 310 of the MFT 206 are connected to a pattern of printed wiring 312 of the printed circuit board 202. A first opening 314 in the ground plane 302 is aligned with the electrical terminals 310. It has been found that providing the first opening 314 reduces an undesirable parasitic interaction of the conductive parts 304, 306, 308 of the MFT 206 and the antenna 204, and improves the radiative efficiency of the antenna 204. The hinge detent mechanism 208 is also made of electrically conductive metal. A second opening 316 in the ground plane 302 is provided underneath the hinge detent mechanism 208 in the interest of further improving the radiative efficiency of the antenna 204. Note that the ground plane 302 may comprises multiple layers of the printed circuit board 202.
In the foregoing specification, specific embodiments of the present invention have been described. However, one of ordinary skill in the art appreciates that various modifications and changes can be made without departing from the scope of the present invention as set forth in the claims below. Accordingly, the specification and figures are to be regarded in an illustrative rather than a restrictive sense, and all such modifications are intended to be included within the scope of present invention. The benefits, advantages, solutions to problems, and any element(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential features or elements of any or all the claims. The invention is defined solely by the appended claims including any amendments made during the pendency of this application and all equivalents of those claims as issued.
