Abstract: An electromagnetic interference (EMI) suppressor having a bandpass filtering function is provided. The EMI suppressor is disposed on a substrate, and includes a signal line, a ground line, an open-circuit line, a first line group, and a second line group. The signal line has an input terminal and an output terminal for feeding in and feeding out electromagnetic wave signals respectively. One terminal of the ground line is connected to the signal line and the other terminal is a ground terminal. One terminal of the open-circuit line is connected to the signal line and the other terminal is an open-circuit terminal. The first line group is formed by a first open-circuit line and a second open-circuit line, and is connected to the signal line. The second line group is formed by a third open-circuit line and a fourth open-circuit line, and is connected to the signal line.

Abstract: A wireless network device has a signal detection function and a switching method for the same. A wireless network signal detection module is installed in the wireless network device, and is switched to a wireless network interface card mode or a wireless network signal detection mode after the voltage regulator in the device determines the load voltage. So that the versatile wireless network device is formed to detect the wireless network signal without the PC's help. The steps of switching to the signal detection mode are inclusively detecting the load voltage, switching to the wireless network signal detection mode, scanning the wireless network signal, and finally showing a result in a plurality of manners.

Abstract: A wireless network device is provided for switching into a first functional mode and a second functional mode according to the source of received power. The wireless network device includes a wireless network communication module, a processor, a power module, and a voltage regulator. The wireless network communication module is utilized for transceiving wireless network signal, and the processor is connected to the wireless network communication module. The power module selectively receives a power from one of a battery and a computer. The voltage regulator is connected to the processor, for selectively switching into the first functional mode when receiving the power form the battery, or switching into the second functional mode when receiving the power from the computer.

Abstract: A dipole antenna with reduced feedline reverse current is provided. A substrate includes a first surface and a second surface, with a feed aperture and a ground aperture penetrating through both the first and second surfaces. A radiator is configured on the first surface for receiving and transmitting wireless signals. A feeder configured on the second surface connects the radiator through the feed aperture. A ground portion with a main notch is configured on the second surface and connects the radiator through the ground aperture. A feedline passing the main notch has an end connecting to the feeder and the ground portion. The reverse current of the feed line is absorbed by the ground portion around the main notch.

Abstract: An antenna system designed to enhance power efficiency of a patch antenna for wireless transmission is provided. The system includes a patch antenna, a reflective plate, a transmission line, and a printed circuit board assembly. The reflective plate is arranged at the position of ¼? away from the patch antenna, to reflect the electro-magnetic waves, radiated behind the patch antenna. Because the antenna and the reflective plate are away from ¼?, the reflective signals returned to the patch antenna constructively interfere with the signal radiated from the antenna. Therefore, the provided system may strengthen the gain of the antenna. Further, the electromagnetic interference is decreased at the position close to the printed circuit board assembly behind the reflective plate.

Abstract: A dipole antenna includes a board and a dipole element. The board includes a dielectric substrate. The dipole element resonates within a predetermined bandwidth, and includes a pair of bilaterally symmetrical radiating arms, each of which is formed on the dielectric substrate. The dipole antenna has a relatively high degree of omni-directivity.

Abstract: A dipole antenna is provided. A radiation portion receives radio signals. A first matching portion includes a body section with one terminal connecting to the radiation portion, and a feed section connecting to another terminal of the body section. A second matching portion has one terminal connecting to the radiation portion to brace the radiation portion with the first matching portion in a cooperative manner. A ground portion connects to another terminal of the second matching portion. The radiation portion has an electric length of a half of a wavelength. The two matching portions have an electric length of a quarter of a wavelength. The radiation portion and the matching portions may be formed in an integrated manner.

Abstract: A planar inverted F antenna includes a radiation portion to receive or transmit a radio signal, a short portion having one end connecting to the radiation portion to brace the radiation portion, a ground portion connecting to the short portion on another end, and a feed section located between the radiation portion and the ground portion, wherein the feed section has one end connecting to the radiation portion and another end directed towards the ground portion but not connected to the ground portion. The radiation portion, short portion, ground portion and feed section are formed in an integrated manner.

Abstract: Disclosed is a 3D inverted F-antenna for easy production, fast assembly, wider bandwidth that provides excellent capacity of radiating and receiving wireless signal inside wireless communication devices. The 3D inverted F-antenna includes a ground plate. A radiating plate has a hole wherein the dimensions of the radiating plate and the hole are decided by ½ of the predetermined resonance wavelength. A shorting unit is connected to the ground plate and the radiating plate. A media is located between the ground plate and the radiating plate for isolating the ground plate and the radiating plate. A conductive signal feeding device is located in the ground plate and electrically coupled to the radiating plate for transmitting signal.

Abstract: A antenna for improving the data transmission efficiency of the wireless network by using the micro strip and Gama matching theories includes: a dielectric material, two radiating portions locating on the dielectric material, a ground surface locating on the dielectric material with a plurality of holes, and two reactance portions for modulating the antenna impedance. Moreover, two reactance portions are integrated as a Gama matching. Hence, the radiating portions connecting with the reactance portions combine with the ground surface as a micro strip on the dielectric material for conducting the antenna signal.

Abstract: A new type circuit board antenna is proposed. There is a circuit board having a surface. A first strip conducting part locates at the surface of the circuit board. A first U-type conducting part locates at the surface of the circuit board and connects with the first strip conducting part. A second U-type conducting part locates at the surface of the circuit board and is complementary with the first U-type conducting part. A grounding part locates at the surface of the circuit board and connects with the first strip conducting part. A second strip conducting part connects with the second U-type conducting part and combines the ground part as a micro strip for conducting the antenna signal.

Abstract: An inverted F-antenna includes a first plane; a second plane connecting to the first plane and having a gap; a third plane connecting to the second plane on an opposite side of the first plane; a fourth plane connecting to the third plane and having a distance from the first plane on an opposite side of the second plane; and a pillar connecting to a margin of the fourth plane and projecting to the gap of the second plane for forming the inverted-F antenna.

Abstract: An inverted-F antenna comprises a first plane; a second plane connecting to the first plane and having a gap; a third plane connecting to the second plane on an opposite side of the first plane; a fourth plane connecting to the third plane and having a distance from the first plane on an opposite side of the second plane; and a pillar connecting to a margin of the four plane and projecting to the gap of the second plane for forming the inverted-F antenna.

Abstract: A signal propagation method is proposed for propagating a wireless signal from a first access point of a first wireless network to a second access point of a second wireless network comprising steps of providing a third access point for transmitting and receiving the wireless signal; transmitting the wireless signal from the first access point to the third access point; and transmitting the wireless signal form the third access point to the second access point.

Abstract: A device for detecting a signal of a wireless local area network comprising a portable entity for being taken by a user to find a strength of the signal at a point in the wireless local area network; a wireless transceiver located in the portable entity for receiving the signal; a controller located in the portable entity and electrically connected to the wireless transceiver for processing the signal and producing a result; and a controllable panel located on the portable entity and electrically connected to the controller for displaying a message about a distribution status of the signal to the user according the result.