Abstract: A dual-frequency directional antenna includes a dielectric substrate, high frequency antenna elements, low frequency antenna elements, symmetrical micro-strip lines and baluns respectively disposed on a front surface and a rear surface of the dielectric substrate. Two ends of a symmetrical micro-strip line are respectively connected to two low frequency antenna elements. The high frequency antenna elements are disposed between two low frequency antenna elements and connected to a symmetric micro-strip line. Each balun is disposed between two high frequency antenna elements, one end of the balun is connected to a middle segment of a symmetrical micro-strip line and the other end is connected to an antenna feeding port. The dual-frequency directional antenna according to the present invention with thin and compact size has dual operating frequency bands property and is applicable for indoor environment.

Abstract: A log-periodic dipole array antenna including a dielectric substrate, and antenna elements, symmetrical microstrip lines and baluns disposed on two corresponding surfaces of the substrate is provided. The antenna elements on each surface are connected to one side of the corresponding symmetrical microstrip line, respectively. The width of at least one antenna element on each surface is broadened gradually outwards from the side of the antenna element, which is connected to the corresponding symmetrical microstrip line. In addition, the baluns are connected to the ends of the corresponding symmetrical microstrip lines, respectively. The antenna elements on one surface are in a mirror-image relation to those on the other surfaces. The log-periodic dipole array antenna features increased broadband with a thin and compact-size, better margin in design to meet different bandwidth requirements.

Abstract: A wireless transmission apparatus including a signal output/input port and an antenna module is provided. The antenna module is used for receiving and transmitting wireless signals satisfying a transmission standard IEEE 802.11. The antenna module is electrically connected to the signal output/input port. Furthermore, the antenna module is rotated with respect to the signal output/input port. The antenna module has two degrees of freedom in rotation directions, such that it is easy to adjust the position of antenna module so that the wireless transmission apparatus has a good signal receiving quality.

Abstract: A log-periodic dipole array antenna including a dielectric substrate, and antenna elements, symmetrical microstrip lines and baluns disposed on two corresponding surfaces of the substrate is provided. The antenna elements on each surface are connected to one side of the corresponding symmetrical microstrip line, respectively. The width of at least one antenna element on each surface is broadened gradually outwards from the side of the antenna element, which is connected to the corresponding symmetrical microstrip line. In addition, the baluns are connected to the ends of the corresponding symmetrical microstrip lines, respectively. The antenna elements on one surface are in a mirror-image relation to those on the other surfaces. The log-periodic dipole array antenna features increased broadband with a thin and compact-size, better margin in design to meet different bandwidth requirements.

Abstract: A dual-frequency directional antenna includes a dielectric substrate, high frequency antenna elements, low frequency antenna elements, symmetrical micro-strip Lines and baluns respectively disposed on a front surface and a rear surface of the dielectric substrate. Two ends of a symmetrical micro-strip line are respectively connected to two low frequency antenna elements. The high frequency antenna elements are disposed between two low frequency antenna elements and connected to a symmetric micro-strip line. Each balun is disposed between two high frequency antenna elements, one end of the balun is connected to a middle segment of a symmetrical micro-strip line and the other end is connected to an antenna feeding port. The dual-frequency directional antenna according to the present invention with thin and compact size has dual operating frequency bands property and is applicable for indoor environment.

Abstract: An ultra-wideband directional antenna is disclosed, including a dielectric substrate, and antenna elements, symmetrical microstrip lines and baluns on front and back surfaces of the dielectric substrate. Each end of the symmetrical microstrip line is connected to two antenna elements. Wherein, a width of the antenna elements increases gradually outwards from sides of the antenna elements connected to the symmetrical microstrip lines. One end of the balun is connected to the middle segment of the symmetrical microstrip lines, and the other end of the balun is connected to an antenna feeding port. The ultra-wideband directional antenna with thin and compact size has a broadband property with respect to VSWR and a radiation pattern and is suitable for indoor application.