Abstract: A multi-band broadband antenna with mal-position feed structure includes a signal line of high-frequency radiation path with a signal feed-in point, and a ground line of low-frequency radiation path with opposing ground feed-in point and top-loading portion. The design exhibits a mal-position feed structure so that a co-planar waveguide structure is formed in the multi-band broadband antenna to increase the antenna's operating bandwidth.

Abstract: The proposed antenna structure has first and second asymmetric radiated-strip structures developed by modifying the structure of a printed T-type monopole. Specifically, by combining the radiated-strip and the shorting-line, the proposed antenna structure is similar to modified Type III balun and dipole fed by microstrip-line structure. Hence, the proposed antenna structure can also be regarded as a “quasi-balanced” antenna structure.

Abstract: A method for driving a light-emitting diode based upon an AC input voltage includes receiving and full-wave rectifying the AC input voltage to generate a full-wave rectified input voltage, generating a pulse width modulation signal according to the full-wave rectified input voltage and a luminance signal, and generating a driving voltage according to the pulse width modulation signal and the full-wave rectified input voltage, and applying the driving voltage to the light-emitting diode.

Abstract: A multi-band broadband antenna with mal-position feed structure includes a signal line of high-frequency radiation path with a signal feed-in point, and a ground line of low-frequency radiation path with opposing ground feed-in point and top-loading portion. The design exhibits a mal-position feed structure so that a co-planar waveguide structure is formed in the multi-band broadband antenna to increase the antenna's operating bandwidth.

Abstract: The proposed antenna structure has first and second asymmetric radiated-strip structures developed by modifying the structure of a printed T-type monopole. Specifically, by combining the radiated-strip and the shorting-line, the proposed antenna structure is similar to modified Type III balun and dipole fed by microstrip-line structure. Hence, the proposed antenna structure can also be regarded as a “quasi-balanced” antenna structure.

Abstract: A method for driving a light-emitting diode based upon an AC input voltage includes receiving and full-wave rectifying the AC input voltage to generate a full-wave rectified input voltage, generating a pulse width modulation signal according to the full-wave rectified input voltage and a luminance signal, and generating a driving voltage according to the pulse width modulation signal and the full-wave rectified input voltage, and applying the driving voltage to the light-emitting diode.

Abstract: An embodiment of the invention provides a clock and data recovery circuit. The clock and data recovery circuit comprises a phase detector, a pre-accumulator, a register, an accumulator and a digital controlled oscillator. By using the transmission path formed by the pre-accumulator, the output of the phase detector can be transmitted to the digital controlled oscillator in advance to adjust the frequency of its output clock signal and the latency due to the accumulator can be reduced.

Abstract: An embodiment of the invention provides a clock and data recovery circuit. The clock and data recovery circuit comprises a phase detector, a pre-accumulator, a register, an accumulator and a digital controlled oscillator. By using the transmission path formed by the pre-accumulator, the output of the phase detector can be transmitted to the digital controlled oscillator in advance to adjust the frequency of its output clock signal and the latency due to the accumulator can be reduced.

Abstract: A broadband antenna applicable to a portable wireless electronic communication product, and especially suitable to be provided on the top or on two sides of a panel, it includes structurally a low-frequency antenna path, a high-frequency antenna path connected with the low-frequency antenna path, and a coaxial cable for feeding out a signal; the core line of the coaxial cable for signal transmission is connected with a signal feed-in point of the antenna, but a grounding line of the coaxial cable is not connected with the antenna to avoid making the coaxial cable a parasitic element of the antenna; the coaxial cable is arranged parallely to the low-frequency antenna path or the high-frequency antenna path, the grounding line of the coaxial cable is used to do perturbation against the transmission path of the antenna, thereby the antenna can get an effect of a broad bandwidth.

Abstract: A planar antenna with a short-trace applied to multi-band mobile handset electronic devices, the structure includes two main resonant elements that are bent around each other and the short-trace, the short-trace is connected between a feed-point and a ground-point; by influence of a loop surface current induced by the short-trace, the antenna gets a broadband effect at multi-frequencies.

Abstract: A monopole broadband antenna including a connecting segment for connecting an antenna circuit of a set of equipment, the connecting segment is provided thereon sequentially with a shaft portion with a small diameter and a shaft portion with a large diameter in connecting with the shaft portion with the small diameter; the shaft portion with the small diameter and the shaft portion with the large diameter together form the monopole broadband antenna. The antenna can be used for equipment such as a digital TV or a Wireless Local Area Network and can get a larger rate of use of band width.

Abstract: A device for a set of radio communication equipment to reduce electromagnetic energy absorbency of a human body, it suits especially the equipment of a mobile phone, a Blue Tooth or a PDA etc. The standing wave ratio at a point 1 is set to be higher than that at a point 2 of the first working frequency of a multi-frequency wave band, so that the SAR value can be largely lowered. In a preferred embodiment, a point 1 of the first working frequency has 880 MHz, while a point 2 has 960 MHz.

Abstract: A 3D measuring method and an equipment for an antenna of a wireless communication product, the measuring method following steps: positioning an object to be tested on a turntable capable of rotating for 360°; and driving an antenna testing and receiving device to rotate about the turntable and the object to be tested thereon to obtain a 3D measuring field type.

Abstract: A multi-frequency antenna with a single layer and a single feeding point, and especially an improved microstrip antenna with its bandwidths simplified and enlarged, it has a central microstrip with a set length and a set width; the bottom end of the central microstrip is used as a feeding point, the top end thereof is extended bilaterally to form respectively a first band section and a second ban section. The first band section is provided on the end thereof with a first open circuit point, and the second ban section is provided on the end thereof with a second open circuit point. A grounding line of a set length and a set width is located at a position a distance below the feeding point on the bottom end of the central microstrip. The lengths from the feeding point to an open circuit point on the end of the first band section and to an open circuit point on the end of the second ban section are both ¼ ? of the ban section to be used.

Abstract: A U-shaped multi-frequency antenna of high efficiency, the antenna has a common feed line connected with an inner and an outer U-shaped wire in symmetrical forms respectively to decide impedance bandwidths of frequency bands selected, and has a balanced circuit of the structure of a Balun circuit having a gradually tapered microstrip to harmonize the impedance bandwidths. Thereby such an omni-directional multi-frequency antenna with a high gain and a bandwidth can be conveniently manufactured.

Abstract: A hidden planar antenna module for a mobile phone especially capable of direct connecting with a circuit board of a mobile phone to simplify the procedure of assembling, the module is provided with a base plate with a suitable area, the base plate has on a surface thereof a first micro-strip section and second micro-strip section being in relation with wavelengths of corresponding operation frequencies. The front ends of the micro-strip sections make an open circuit, the tailing ends of them are connected to be used as a third micro-strip section of a feed line. The second micro-strip section connected with the tailing end of the first micro-strip section forms an open stub for adjusting frequency width and impedance matching. The present invention is characterized in that: the feed line is connected with the micro-strips of a related circuit and the grounding line to form the antenna module with a coplanar wave guide effect.

Abstract: A U-shaped multi-frequency antenna of high efficiency, the antenna has a common feed line connected with an inner and an outer U-shaped wire in symmetrical forms respectively to decide impedance bandwidths of frequency bands selected, and has a balanced circuit of the structure of a Balun circuit having a gradually tapered microstrip to harmonize the impedance bandwidths. Thereby such an omni-directional multi-frequency antenna with a high gain and a bandwidth can be conveniently manufactured.

Abstract: A multi-frequency antenna with a single layer and a single feeding point, and especially an improved microstrip antenna with its bandwidths simplified and enlarged, it has a central microstrip with a set length and a set width; the bottom end of the central microstrip is used as a feeding point, the top end thereof is extended bilaterally to form respectively a first band section and a second ban section. The first band section is provided on the end thereof with a first open circuit point, and the second ban section is provided on the end thereof with a second open circuit point. A grounding line of a set length and a set width is located at a position a distance below the feeding point on the bottom end of the central microstrip. The lengths from the feeding point to an open circuit point on the end of the first band section and to an open circuit point on the end of the second ban section are both ¼ &lgr; of the ban section to be used.

Abstract: The dipole antenna array is formed by connecting a plurality of dipole antennas, one end of the dipole antenna array has an open stub and a balancing circuit to adjust the width of frequency band, impedance and gain of the antenna array. Each dipole antenna is added on the two ends thereof with antenna loading devices such as a plurality of mini-aperture antennas. The dipole antenna array can have an option to add a reflector on an end thereof.

Abstract: A device for a set of radio communication equipment to reduce electromagnetic energy absorbency of a human body, it suits especially the equipment of a mobile phone, a Blue Tooth or a PDA etc. The standing wave ratio at a point 1 is set to be higher than that at a point 2 of the first working frequency of a multi-frequency wave band, so that the SAR value can be largely lowered. In a preferred embodiment, a point 1 of the first working frequency has 880 MHz, while a point 2 has 960 MHz.