Abstract: A low-profile, tri-filar, helix antenna having circular polarization (CP) includes a single feed, in the absence of an internal feed network. The antenna includes three metal, bent, quarter-wave monopoles that are physically positioned at 0, 120, and 240 degrees, respectively, on a top flat surface of the antenna. One of the monopoles is directly-fed, and the other two monopoles are parasitically coupled to the directly-fed monopole. Metal perturbations on one or both of the two parasitic monopoles control their coupling-phase to the directly-fed monopole. One of the parasitic monopoles couples at positive 120 degrees to the directly-fed monopole, and the other parasitic monopole couples at negative 120 degrees to the directly-fed monopole. Various perturbation options generate this CP phasing.

Abstract: Operating parameters of a planar antenna are controlled by providing a planar metal radiating element having an edge, by providing a slot within the radiating element, the slot having side walls, an open slot-end that lies on the edge of the radiating element, and a closed slot-end the lies within the radiating element, and by providing a thin, line-like, and metal segment, at least a portion of which is coplanar with the radiating element and that extends from the open slot-end to the closed slot-end without physically engaging the slot's side walls. The metal segment can be connected to the antenna's ground plane to thereby form a parasitic element, or the metal segment can be connected to the radiating element to thereby form an extension of the radiating element.

Abstract: Single feed planar inverted-F antennas (PIFAs) are provided for three, four or five frequency bands of resonance in both cellular and non-cellular frequency bands. The PIFAs include a dielectric carriage having a metal radiating element located on a top surface thereof and sidewalls having a metal ground plane element located at the bottom of the sidewalls. The non-radiating edge of the radiating elements include a downward extending shorting strip that is connected to the ground plane element and a downward extending feed strip that is spaced above the ground plane element and is connected to a feed cable. The radiating element includes downward extending matching and loading plates whose free ends are spaced above the ground plane element, which provide impedance matching and reactive loading to the radiating elements.

Abstract: A low-profile, tri-filar, helix antenna with linear polarization or circular polarization (CP) includes a single feed without an internal feed network. The antenna includes three metal, bent, quarter-wave monopoles positioned at 0°, 120°, and 240° on a top surface of the antenna. One of the monopoles is directly fed, and the other two are parasitically coupled to the fed monopole. Metal perturbations on the parasitic monopoles control their coupling phase to the fed monopole, and determine the antenna's polarization. Without metal perturbations, the parasitic monopoles are linear polarized and both monopoles are coupled to the fed monopole at ±120. With metal perturbations, the parasitic monopoles are CP polarized and coupled at +120 degrees to the fed monopole. Various perturbations, capacitive and inductive shunts options are possible. The three monopoles are supported by a dielectric substrate, or they are freestanding.

Abstract: This invention presents new and alternative design techniques of single feed Dual/Tri ISM band PIFA for wireless system applications. To attain the advantages of and in accordance with the purpose of the present invention, dual and/or tri ISM band PIFA antennas are provided. In particular, an antenna comprises at least a ground plane, a radiating element, a short, and a feed tab. The short provides a connection between the ground plane and the radiating element. The feed tab connected to the radiating element provides RF power and provides initial impedance match. While the feed tab provides initial impedance match, additional impedance match and frequency control are obtained by the inclusion of one or more of a parasitic element, a slot, tuning stubs, and capacitive elements.

Abstract: The present invention provides an antenna mounting device comprising mounting unit to supply compressive force between an antenna and a panel. The mounting unit includes a forcing cone and anchor and a member designed to supply compressive force such that the anchor and forcing cone are compressed into each other.

Abstract: The present invention relates to a non-rectangular shaped PIFA capable of dual ISM band operation using a single power feed. The dual frequency operation of the PIFA is accomplished by using a slot in the radiating element to quasi partition the radiating element. The dual band performance of the PIFA is realized through the integration of either the microstrip or the Co Planar Waveguide (CPW) feed line to the antenna structure.

Abstract: A three-band, two-antenna, assembly includes a planar inverted-F antenna (PIFA) having a radiating/receiving element that is spaced from and extends generally parallel to a ground plane element. The planar radiating/receiving element of an inverted-F antenna (IFA) is located in an open space that exists between the radiating/receiving element of the PIFA and the ground plane element. The radiating/receiving element of the IFA extends either perpendicular to, or parallel to, the radiating/receiving element of the PIFA. The radiating/receiving element of the PIFA includes one or more open slot configurations that operate to provide dual resonant frequencies for the IPFA (AMPS/PCS or GSM/DCS). The radiating/receiving element of the IFA operates in a non-cellular frequency band (ISM or GPS).

Abstract: A compact planar antenna is disclosed wherein a radiating element in the shape of a right triangle is formed on a substrate. A ground plane may be positioned on one or both sides of the substrate. A slot extends into the radiating element from one side thereof.

Abstract: A multi-band antenna including a retractable antenna and a meander antenna wherein the meander antenna may take several forms. In all of the embodiments, the meander antenna comprises first and second meander radiating elements. In one form of the invention, the closed ends of the loops of the second meander radiating element protrude into the open ends of the loops of the first meander radiating element. In other forms of the invention, active and/or passive elements are positioned between the first and second meander radiating elements. In some forms of the invention, the active or passive elements include stubs which protrude into the open ends of the loops of the first meander radiating element.

Abstract: A Planar Inverted F-Antenna (PIFA) comprising: a radiating element placed above a dielectric carriage with four side walls; a ground plane positioned below the dielectric carriage; a short circuiting element at the front edge of the radiating element; a feed tab at the front edge of the radiating element; vertical planes formed along the right and left edges of the radiating element forming capacitive loading plates; a first reactive loading slot formed in the radiating element between the short circuiting element and the left edge thereof; the open end of the first reactive loading slot being at the front edge of the radiating element; a second reactive loading slot formed in the radiating element between the feed tab and the right edge thereof; the open end of the second reactive loading slot being at the back edge of the radiating element; conductive stubs at the front and back edges of the radiating element for tuning lower and upper resonant frequencies; a conductive strip having a vertical attachment in

Abstract: An antenna is described for use with a wireless communications device wherein the antenna comprises a helical radiator having a connector at one end thereof with the helical radiator and connector being of one-piece, unitary construction. In one embodiment, the radiator and connector are formed through a plastic injection molding procedure while in another embodiment, the radiator and connector are formed by use of a metal die-casting procedure. Modified forms of the antenna are also disclosed.

Abstract: A diversity antenna comprising two planar inverted F antennas (PIFAs) characterized by: two radiating elements with or without the physical separation between them; the spatially separable radiating elements of the two PIFAs with side-by-side or orthogonal placement with respect to each other are combined to form an equivalent single element consisting of the composite assembly of two radiators; a small ground plane of rectangular or L-shape with or without bending at its opposite ends is common to both the radiating elements; the radiating elements are placed above the unbent common ground plane; the radiating elements are placed above the vertical sections of the bent common ground plane; the shorted ends of the spatially separated radiating elements are placed back to back on the said common ground plane; a common shorting post placed along the common boundary line resulted by the merging of the two radiators with a prior side by side mutual placement; a common shorting post placed within the common bounda

Abstract: A surface mounted CHIP antenna is provided for a wireless communications device such as a wireless modem, cellular telephone, personal digital assistant, etc. The antenna is mounted directly to the circuit board of the unit and exhibits electrical performance equivalent to a traditional external antenna. The antenna includes a conductive trace which is embedded or encapsulated in a high temperature, non-conductive dielectric material. One end of the trace has a transceiver circuit lead protruding therefrom which is soldered to the feed of the transceiver circuit. One or more ground plane leads protrude from the other end of the body member and are soldered to the ground plane. The ground plane lead is electrically insulated from the trace.

Abstract: A dual feed internal antenna is disclosed which provides an internal antenna with multiple frequency response through the use of two or more internal antennas within one package. Each internal antenna has its own feed and ground connection. For example, a planar inverted F antenna provides response at cellular telephone frequencies and an inverted F antenna provides response at Industrial, Scientific, and Medical (ISM) band of frequencies.

Abstract: A tunable PIFA antenna is disclosed for use with wireless communication devices. In three embodiments of the invention, a movable tuning member constructed of a high-dielectric constant material is selectively moved with respect to the feed and shorting pins of the antenna to vary the frequency response of the antenna. In the fourth embodiment, a slot is molded into the frame of the antenna. The size and position of the slot is varied by the molding tool to vary the frequency response of the antenna.

Abstract: A Planar Inverted F Antenna (PIFA) is disclosed comprising a radiator assembly positioned in the interior of a lower Radome member. An upper Radome member is placed over the radiator assembly with the upper Radome member and the lower Radome member fully enclosing the radiator assembly. The radiator assembly is held to the upper and lower Radome members by means of three dielectric blocks on each member. The radiator assembly comprises: (1) two radiating elements placed on the opposite sides of common ground plane; (2) two separate shorting strips extending between one end of each radiating element and one end of common ground plane; (3) a common feed conductor in the form of a single strip connecting one edge of each radiating element and the common feed conductor which has a disc-shaped portion with an opening formed therein. A ground tab is formed as an extension of the common ground plane.

Abstract: A press-in contact is disclosed for use in a battery pack including a plastic housing which is closed by a plastic cover. The plastic housing has a plurality of circular openings formed therein while the plastic cover is also provided with a plurality of circular openings formed therein. A press-in contact is inserted into each of the openings which have pre-described geometry. A circumferential barb is provided on the inner end of each of the press-in contacts and serves as a mechanical connection of the contact to the plastic housing or cover and also provides a watertight seal. The inner ends of the contacts are operatively connected to a flexible circuit board within the battery pack.

Abstract: A switch contact for a wireless communication device is disclosed which is comprised of a generally U-shaped spring contact positioned between a printed circuit board and a planar inverted F antenna in a compressed state for electrically connecting the printed circuit board to a feed point on the planar inverted F antenna. The leg portions of the spring contact are provided with spring extensions which are overlapped and which are biased towards one another.

Abstract: A compact dual diversity antenna for RF data and wireless communication devices having a printed circuit board is disclosed. First and second PIFAs are mounted on the PCB in a spaced relationship. Each of the first and second PIFAs include radiating elements having ground planes and shorting posts. The ground plane of the second PIFA is disposed in the same plane as the PCB. The ground plane of the first PIFA is orthogonally disposed with respect to the ground plane of the second PIFA. First and second feed posts connect the first and second PIFAs to the PCB through RF feed lines. The first and second feed posts are disposed perpendicularly to one another.