Abstract: An ultra wideband antenna includes a substrate, a transmission line coupled to the substrate, and a radiating element coupled to the transmission line at a distance from the substrate and being symmetric about the transmission line. An outer edge of the radiating element has a shape defined by a binomial function.

Abstract: A wide frequency band planar antenna comprises an elongated portion, substantially parallel to a circumferential edge of a ground pattern and comprising one end connected to a feeding transmission line, wherein there is a gap between the elongated portion and the circumferential edge of the ground pattern; a body stub and an impedance-matching-adjusting pattern for adjusting an impedance matching between the wide frequency band planar antenna and the feeding transmission line; wherein the gap value is less than 2 mm so as to enable the wide frequency band antenna to operate at a wide range of frequencies ranging from 2.3 GHz to near 6 GHz, thereby allowing the wide frequency band antenna to be applied in both WiFi LAN and WiMAX MAN.

Abstract: A multiple-frequency antenna includes a circuit board of dielectric material having a first surface and a second surface which is spaced apart from and is substantially parallel to the first surface, a ground plane layer of electrically conductive material covering a portion of the first surface of the circuit board, and a feed-line of electrically conductive material disposed on the second surface of the circuit board so as to extend over the ground plane layer. A first radiating element of electrically conductive material is disposed on the circuit board and electrically connected to the feed-line. A second radiating element of electrically conductive material is disposed on the circuit board in close proximity to the first radiating element for coupling with the first radiating element, the coupling providing an electromagnetic feed to the second radiating element.

Abstract: A wide frequency band planar antenna comprises an elongated portion, substantially parallel to a circumferential edge of a ground pattern and comprising one end connected to a feeding transmission line, wherein there is a gap between the elongated portion and the circumferential edge of the ground pattern; a body stub and an impedance-matching-adjusting pattern for adjusting an impedance matching between the wide frequency band planar antenna and the feeding transmission line; wherein the gap value is less than 2 mm so as to enable the wide frequency band antenna to operate at a wide range of frequencies ranging from 2.3 GHz to near 6 GHz, thereby allowing the wide frequency band antenna to be applied in both WiFi LAN and WiMAX MAN.

Abstract: A second-order bandpass filter having an improved frequency response is disclosed, in which a grounding capacitor is connected electrically to a two-port network as a feedback path so as to provide two finite transmission zeros. With the two transmission zeros, signals of second harmonic frequency and GSM signals may be blocked out from the pass band of the filter and thus filtered out. As such, the filter may be utilized in wireless local area network (WLAN) application. Further, since no extremely small value component is used within the filter, the frequency response may not be influenced by a manufacturing process of the filter. In addition, the thus formed filter has a relatively smaller volume.

Abstract: An antenna has a central core with a central coupling region. At least one pair of radiating antenna lines is formed a surface of the central core in a helix structure. A circuit board has a protruding structure and is electrically coupled to the pair of radiating antenna lines. The protruding structure of the circuit board affixes into the central coupling region of the central core, and a signal input/output (I/O) end of the antenna is on the circuit board. The circuit board has a balun transformer, preferably using the LC resonators in two paths with a desired equivalent resonant length, so as to preferably produce the difference by half wavelength.

Abstract: An antenna has a central core with a central coupling region. A pair of helix antenna lines is formed a surface of the central core. A balun transformer is formed on a circuit board and electrically coupled to the pair of radiating antenna lines. Wherein, the circuit board has a protruding structure to affixing into the central coupling region of the central core. A signal input/output (I/O) end of the antenna is at another end of the balun transformer. The balun transformer preferably uses the LC resonators in two paths with a desired equivalent resonant length, so as to preferably produce the difference by half wavelength.

Abstract: A multiple-frequency antenna includes a circuit board of dielectric material having a first surface and a second surface which is spaced apart from and is substantially parallel to the first surface, a ground plane layer of electrically conductive material covering a portion of the first surface of the circuit board, and a feed-line of electrically conductive material disposed on the second surface of the circuit board so as to extend over the ground plane layer. A first radiating element of electrically conductive material is disposed on the circuit board and electrically connected to the feed-line. A second radiating element of electrically conductive material is disposed on the circuit board in close proximity to the first radiating element for coupling with the first radiating element, the coupling providing an electromagnetic feed to the second radiating element.

Abstract: A dual frequency band inverted-F antenna used for communicating a low frequency signal and a high frequency signal includes a substrate, a ground metal, a vortical metal structure, a short circuit leg, a feeding leg, and a terminal micro strip. The ground metal and the terminal micro strip are formed on the lower surface of the substrate. The vortical metal structure, formed on the upper surface of the substrate, further has a short circuit end and an open circuit end. The short circuit leg connects electrically the short circuit end of the vortical metal structure with the ground metal. The feeding leg extends along a predetermined direction of the vortical metal structure to couple with a feeding circuit on the substrate. The terminal micro strip connects electrically to the open circuit end through a first conductive aperture.

Abstract: The present invention discloses a printed antenna structure. The printed antenna structure comprises: a dielectric layer having opposed surfaces, a ground plane layer covered on the first surface of the dielectric layer, a feed-line extending over the second surface of the dielectric layer and connecting to a driving circuitry, a primary radiating element connected to the feed-line and not extending over to the ground plane layer, and a tuning element connected to the primary radiating element and not extending over to the ground plane layer for adjusting the radiating frequency. The timing element her comprises two stubs each having a free end spaced apart from each other and a fixed end connected to the primary radiating element so as to reduce the overall length of the printed antenna.

Abstract: The dual-band monopole printed antenna of this invention comprises: a monopole printed antenna body to perform resonance in response to a first frequency, with one end of the body connected to feed-in line; a tail; and a short-circuited transmission line connecting the other end of the antenna body and an end of the tail; wherein the short-circuited transmission line forms open circuit at its connection with said antenna body when supplied with a current of the first frequency and wherein the antenna body, the transmission line and the tail together perform resonance in response to a second frequency.

Abstract: A multiple-frequency antenna includes a circuit board of dielectric material having a first surface and a second surface which is spaced apart from and is substantially parallel to the first surface, a ground plane layer of electrically conductive material covering a portion of the first surface of the circuit board, and a feed-line of electrically conductive material disposed on the second surface of the circuit board so as to extend over the ground plane layer. A first radiating element of electrically conductive material is disposed on the circuit board and electrically connected to the feedline. A second radiating element of electrically conductive material is disposed on the circuit board in close proximity to the first radiating element for coupling with the first radiating element, the coupling providing an electromagnetic feed to the second radiating element.

Abstract: A multiple-frequency antenna includes a feed-line and a first radiating element electrically connected to the feed-line. A tuning element is electrically connected to the first radiating element. The tuning element contains at least two stubs, each stub having a fixed end connected to the first radiating element and a free end spaced apart from each other. The first radiating element and the tuning element serve to generate a first and a third operating frequency of the multiple-frequency antenna. The antenna also includes a second radiating element electrically connected to the feed-line, the second radiating element serving to generate a second operating frequency of the multiple-frequency antenna.

Abstract: A dual frequency band inverted-F antenna used for communicating a low frequency signal and a high frequency signal includes a substrate, a ground metal, a vortical metal structure, a short circuit leg, a feeding leg, and a terminal micro strip. The ground metal and the terminal micro strip are formed on the lower surface of the substrate. The vortical metal structure, formed on the upper surface of the substrate, further has a short circuit end and an open circuit end. The short circuit leg connects electrically the short circuit end of the vortical metal structure with the ground metal. The feeding leg extends along a predetermined direction of the vortical metal structure to couple with a feeding circuit on the substrate. The terminal micro strip connects electrically to the open circuit end through a first conductive aperture.

Abstract: The present invention discloses a printed antenna structure. The printed antenna structure comprises: a dielectric layer having opposed surfaces, a ground plane layer covered on the first surface of the dielectric layer, a feed-line extending over the second surface of the dielectric layer and connecting to a driving circuitry, a primary radiating element connected to the feed-line and not extending over to the ground plane layer, and a tuning element connected to the primary radiating element and not extending over to the ground plane layer for adjusting the radiating frequency. The timing element her comprises two stubs each having a free end spaced apart from each other and a fixed end connected to the primary radiating element so as to reduce the overall length of the printed antenna.