Abstract: This invention describes the technology of toroidal CATR (compact antenna test range) for generating multiple directional plane waves propagate toward the center axis of QZ (quiet zone). The toroidal CATR consists of torus as main reflector, sub-reflectors, and the corresponding feed antennas of sub-reflectors. This invention is to provide multiple directional plane waves propagating toward the center axis of torus which is also the center axis of QZ. The performances of QZ in this invention are with larger size of QZ and better electrical performance inside QZ. Due to the capability of multiple directional plane waves propagating toward the center axis of QZ, the complexity of positioner (turntable) for AUT (antenna under test) or radar target RCS (radar cross section) in three dimensional power pattern measurement will be simplified.

Abstract: This invention describes the technology of toroidal CATR (compact antenna test range) for generating multiple directional plane waves propagate toward the center axis of QZ (quiet zone). The toroidal CATR consists of torus as main reflector, sub-reflectors, and the corresponding feed antennas of sub-reflectors. This invention is to provide multiple directional plane waves propagating toward the center axis of torus which is also the center axis of QZ. The performances of QZ in this invention are with larger size of QZ and better electrical performance inside QZ. Due to the capability of multiple directional plane waves propagating toward the center axis of QZ, the complexity of positioner (turntable) for AUT (antenna under test) or radar target RCS (radar cross section) in three dimensional power pattern measurement will be simplified.

Abstract: An antenna system includes a monopole antenna with a first end connected to a feed point on a printed circuit board (PCB) and a second end being electrically floating; and a matching conductive stub with a first end connected to a ground point on the PCB and a second end being electrically floating.

Abstract: An antenna system includes a monopole antenna with a first end connected to a feed point on a printed circuit board (PCB) and a second end being electrically floating; and a matching conductive stub with a first end connected to a ground point on the PCB and a second end being electrically floating.

Abstract: A device for enhancing electromagnetic susceptibility comprises a first bridge. The first bridge is near to a first trace of a differential pair routing and electrically connects an RF grounding with an analog grounding. The RF grounding and the analog grounding are separated. The differential pair routing transmits signals between an RF circuit and an analog circuit. The first trace of the differential pair routing is closer to an antenna coupled to the RF grounding than a second trace of the differential pair routing. The RF circuit is coupled to the RF grounding, and the analog circuit is coupled to the analog grounding.

Abstract: A wireless security device includes a nonconductive housing, a mother circuit board, a wireless expansion card, and a metal reflector. The mother circuit board and the wireless expansion card are disposed in the nonconductive housing. The mother circuit board includes a processor. The wireless expansion card includes a dielectric substrate, a ground plane, an inverted-F antenna, and an RF (radio frequency) module. The metal reflector is positioned between the mother circuit board and the wireless expansion card, and is close to the inverted-F antenna. The metal reflector is configured to reduce EMI (Electromagnetic Interference) from the mother circuit board so as to maintain performance of the inverted-F antenna.

Abstract: The technology disclosed relates to patch antennas and methods of using a patch antenna. In particular, it relates to using a rectangular or square ring radiator and a pair of rectangular ring resonators in a patch antenna. The designs and methods described can, for instance, be applied to communications at about 698 to 746 MHz or 746 to 806 MHz, in a frequency range such as 698-806 MHz.

Abstract: A wireless security device includes a nonconductive housing, a mother circuit board, a wireless expansion card, and a metal reflector. The mother circuit board and the wireless expansion card are disposed in the nonconductive housing. The mother circuit board includes a processor. The wireless expansion card includes a dielectric substrate, a ground plane, an inverted-F antenna, and an RF (radio frequency) module. The metal reflector is positioned between the mother circuit board and the wireless expansion card, and is close to the inverted-F antenna. The metal reflector is configured to reduce EMI (Electromagnetic Interference) from the mother circuit board so as to maintain performance of the inverted-F antenna.

Abstract: A device for enhancing electromagnetic susceptibility comprises a first bridge. The first bridge is near to a first trace of a differential pair routing and electrically connects an RF grounding with an analog grounding. The RF grounding and the analog grounding are separated. The differential pair routing transmits signals between an RF circuit and an analog circuit. The first trace of the differential pair routing is closer to an antenna coupled to the RF grounding than a second trace of the differential pair routing. The RF circuit is coupled to the RF grounding, and the analog circuit is coupled to the analog grounding.

Abstract: A phase shifter includes a substrate, an input part, a plurality of first transmission lines, a plurality of second transmission lines, a coupling part, a controller, and a plurality of output parts. When a signal is fed in a first transmission line, the fed signal is distributed to a corresponding second transmission line via the first transmission line, and an area of the second transmission line shielded by the coupling part is changed by rotating the coupling part through the controller, so as to shift a phase of the signal transmitted by the second transmission line.

Abstract: A phase shifter including a substrate, a plurality of first transmission lines, a plurality of second transmission lines, and a coupling portion is described. After the phase shifter feeds a signal into the first transmission lines, the first transmission lines assign the signal to the second transmission lines. Moreover, the coupling portion moves to change an area of the second transmission lines shielded by the coupling portion, so as to change the phase of the signal transferred by each of the second transmission lines.

Abstract: An adjustable phase shifter for an antenna includes a metal circuit portion, a coupling portion, and a grounding portion. The metal circuit portion is used for receiving a fed-in signal, while the coupling portion is disposed on one side of the metal circuit portion and is disposed at an angle with respect to the metal circuit portion, for controlling a phase angle of the fed-in signal by adjusting the angle formed therebetween. The grounding portion is disposed on the other side of the metal circuit portion in parallel. The structure of the adjustable phase shifter for adjusting the phase angle output by the phase shifter is simple, so as to improving the fabrication efficiency. Moreover, the fabrication efficiency of the adjustable phase shifter is able to be further improved by adopting an attachable impedance matcher, or changing the structure of the coupling portion.