Abstract: A power jack, comprising an insulating housing, a socket which set in the bottom of the insulating housing, a movable socket cover which covers the socket and an elastic device between the socket cover and the socket which for ejecting the cover; the housing has a pair of limiting portions each having a button assembled thereto; the socket cover has an elastic arm which could clamp the limiting portion, so as to lock the socket cover; the elastic arm can be pushed away from the limiting portion by the button, so that the cover can be removed away from the socket. Therefore, it is convenient and safe for users to extract the plug with single hand.

Abstract: An antenna comprises: a closed and insulating receiving housing; a radiating portion received in the receiving housing and including a liquid metal; a grounding portion received in the receiving housing and including a liquid metal; a pair of wires respectively connected to the radiating portion and the grounding portion and extending out of the receiving housing; and two air chambers respectively located on the ends of the radiating portion and the grounding portion.

Abstract: A power jack, comprising an insulating housing, a socket which set in the bottom of the insulating housing, a movable socket cover which covers the socket and an elastic device between the socket cover and the socket which for ejecting the cover; the housing has a pair of limiting portions each having a button assembled thereto; the socket cover has an elastic arm which could clamp the limiting portion, so as to lock the socket cover; the elastic arm can be pushed away from the limiting portion by the button, so that the cover can be removed away from the socket. Therefore, it is convenient and safe for users to extract the plug with single hand.

Abstract: An antenna comprises: a closed and insulating receiving housing; a radiating portion received in the receiving housing and including a liquid metal; a grounding portion received in the receiving housing and including a liquid metal; a pair of wires respectively connected to the radiating portion and the grounding portion and extending out of the receiving housing; and two air chambers respectively located on the ends of the radiating portion and the grounding portion.

Abstract: A positioning device, used in antenna's testing system, includes a crane, a fastening device, a testing antenna and a laser generator. The crane includes a gearing with a sliding shoe thereon. The fastening device is fixed on the sliding shoe of the crane. The testing antenna is fixed in font of the fastening device. The laser generator is fastened on the fastening device and located on a level different from the testing antenna. The laser generator sends out laser for defining the position of the testing antenna.

Abstract: A method for zooming image shown in a touch screen includes reading information of a continuous writing locus formed on the touch screen; selecting a first group of points and a second group of points in the writing locus formed in time sequence; dealing with the first group and second group of points and obtaining a first radius and a second radius; comparing the first radius and the second radius to define a zooming command; executing the zooming command. A touch screen reading such writing locus into zooming command is also provided.

Abstract: A positioning device, used in antenna's testing system, includes a crane, a fastening device, a testing antenna and a laser generator. The crane includes a gearing with a sliding shoe thereon. The fastening device is fixed on the sliding shoe of the crane. The testing antenna is fixed in font of the fastening device. The laser generator is fastened on the fastening device and located on a level different from the testing antenna. The laser generator sends out laser for defining the position of the testing antenna.

Abstract: A method for tuning a resonant frequency of an antenna includes the steps of providing an antenna having a radiating element operating at a present resonant frequency, determining a target operating frequency of the antenna, mensurating the present resonant frequency of the antenna and calculating a frequency offset between the present resonant frequency and the target operating frequency, providing a dielectric film covered on the radiating element, tuning an thickness and an area of the dielectric film, and repeating the mensurating step and the tuning step till the frequency offset reaches zero.

Abstract: A dual-band antenna (1) includes a first antenna (2) and a second antenna (3). The first antenna includes a u-shaped first dipole half (11) and an n-shaped second dipole half (12). The first dipole half is disposed above the second dipole half with a space therebetween and the two dipole halves are mirror imaged. The second antenna includes a u-shaped third dipole half (21) and an n-shaped fourth dipole half (22). The first and the third dipole halves are crossly connected with each other at bottom. The second and the fourth dipole halves are crossly connected with each other at top.

Abstract: An electrical connector (1) used in high frequency signal transmission filed includes an insulative housing (2), an immovable contact (5) retained in the housing. The immovable contact includes a main body (50), a cantilevered arm (51) longitudinally extending from the main body, a soldering portion (53) backwardly extending from the main body. The cantilevered arm forms an angle to the main body. The main body is a substantially “Z” shape to prolong the current path of the immovable contact and to cut the area of the immovable contact, thereby decreasing the capacity of the immovable contact.

Abstract: A dual-band antenna for communication device includes a first dipole antenna, a second dipole antenna and a coaxial feed line. The first dipole antenna includes a first radiating element disposed at a first plane and a first ground portion disposed at a second plane. The second dipole antenna includes a second radiating element disposed at a first plane and a second ground portion disposed at a second plane. The feed line includes an inner conductor electrically connecting to the first and second radiating elements and an outer conductor electrically connecting to the first and second ground portions. The first and second radiating elements both further include a compensating portion for improving radiating patterns of the first and second dipole antennas and a broadband portion for increasing frequency bands of the first and second dipole antennas.

Abstract: A dual-band antenna (1) includes a first antenna (2) and a second antenna (3). The first antenna includes a first dipole half (11) and a second dipole half (12). The first dipole half is disposed above the second dipole half with a space therebetween and the two dipole halves are corresponding to each other in a lengthwise direction. The second antenna includes a coaxial cable (4) including an inner conductor feeding the first antenna and comprising an exposed extending section (40) acting as a radiating portion of the second antenna, and a ground patch (5) electrically connected with the second dipole half.

Abstract: A printed PIFA antenna (1) for an electronic device includes a multi-layer substrate, a U-shaped radiating element or rectangular-wave shaped radiating element disposed in the substrate, a ground portion disposed on surfaces of the substrate and a feeder cable including an inner conductor connecting with radiating element and an outer conductor connecting with ground portion. A multi-layer printed technology is introduced into a design of a PIFA antenna, which will achieve a very compact antenna structure.

Abstract: A dual-band antenna for communication device includes a first dipole antenna, a second dipole antenna and a coaxial feed line. The first dipole antenna includes a first radiating element disposed at a first plane and a first ground portion disposed at a second plane. The second dipole antenna includes a second radiating element disposed at a first plane and a second ground portion disposed at a second plane. The feed line includes an inner conductor electrically connecting to the first and second radiating elements and an outer conductor electrically connecting to the first and second ground portions. The first and second radiating elements both further include a compensating portion for improving radiating patterns of the first and second dipole antennas and a broadband portion for increasing frequency bands of the first and second dipole antennas.

Abstract: A multi-band antenna (1) includes a ground patch (10), a first radiating patch (21), a second radiating patch (22), a connecting patch (23) connecting the first and second radiating patches with the ground patch, and a feeder cable (40). The ground patch, the connecting patch, the second radiating patch and the feeder cable form a planar inverted-F antenna (PIFA), and the first radiating patch, the connecting patch, the ground patch and the feeder cable form a loop antenna.

Abstract: A multi-band antenna for enabling an electronic device (such as a laptop computer) to operate in two frequency bands comprises an insulative substrate (30), a conductive element disposed on the substrate, and a feeder cable (40). The conductive element and the feeder cable form a planar inverted-F antenna (10, 23, 21, 25, 24, 11) operating in a lower frequency band and a planar loop antenna (10, 23, 22, 24, 11) operating in a higher frequency band.

Abstract: A multi-band antenna includes a first pole (2) and a second pole (3) connecting with the first pole. The first and second poles are both made of metal sheets. The first pole is rectangular in shape. The second pole includes a first section (31), a second section (32) and a third section (33). The second and third sections connect to the first section. The first, second and third sections integrally form a fork-shaped structure and each section has a different length. The first, second and third sections each radiate at a different frequency. A feeder device (5) includes a coaxial cable which electrically connects with the first pole and the second pole for feeding the antenna.

Abstract: A microstrip antenna structure (1) for used in broadband, multi-frequency range applications includes a dipole antenna (2) comprising two dipole elements (21, 22), a dielectric substrate (3) on which the dipole elements are symmetrically disposed, and a feeding system (5) connected with the dipole antenna. Each dipole element comprises a triangular patch (211 or 221) and a V-shaped tentacle patch (212 or 222) extending from the triangular patch. The two dipole elements together form a butterfly structure antenna. This butterfly structure allows the dipole antenna to operate efficiently in a broadband range in the 2.4-2.5 GHz, 5.15-5.35 GHz and 5.45-5.75 GHz frequency bands.

Abstract: A dual band microstrip antenna (1) made by a method of the present invention includes a dielectric substrate (11), a ground plane layer (10) attached to a bottom surface (111) of the substrate, a first and second conductive patches (21, 22) separately elevated above and parallel to a top surface (110) of the substrate, a first and second conductive posts (23, 24) electrically connecting the first and second conductive patches respectively with the ground plane layer and a first and second coaxial feeder cables (25, 26). A method for making the dual band microstrip antenna includes adjusting the height of the first and second conductive posts to achieve a good performance of the dual band microstrip antenna.

Abstract: A multi-band antenna for enabling an electronic device (such as a laptop computer) to operate in two frequency bands comprises an insulative substrate (30), a conductive element disposed on the substrate, and a feeder cable (40). The conductive element and the feeder cable form a planar inverted-F antenna (10, 23, 21, 25, 24, 11) operating in a lower frequency band and a planar loop antenna (10, 23, 22, 24, 11) operating in a higher frequency band.