56results about How to "Wide frequency bandwidth" patented technology

A portable radio terminal testing apparatus has an antenna coupler 20, a connecting member 16, and a measuring device 15. The antenna coupler 20 has a placement member 35, a coupling antenna 25, a pair of through-connection portions, and an impedance transformer 31. The placement member 35 accepts a portable radio terminal 1, which is a testing object, in an unrestricted state. The coupling antenna 25 is disposed so as to be electromagnetically coupled with an antenna 19 of the portable radio terminal 1, and has a pair of antenna elements which are formed at one face side of a dielectric substrate 26 and which have a planar antenna structure of a predetermined shape, and a pair of feeding points, and is formed from a self-complementary antenna having a predetermined impedance within an operating frequency range including at least 800 MHz to 2.5 GHz order.

An antenna device of the present disclosure includes: a dielectric layer; first and second conductor layers provided on both surfaces, respectively, of the dielectric layer; first and second antenna elements provided in the first conductor layer; a grounded conductor provided in the second conductor layer; and an EBG structure provided between the first and second antenna elements, wherein the EBG structure includes a first EBG portion provided in the first conductor layer, the first EBG portion including a plurality of first patch conductors electromagnetically coupled to the grounded conductor, and a second EBG portion provided in the second conductor layer, the second EBG portion including a plurality of second patch conductors electromagnetically coupled to the grounded conductor.

The invention discloses a saturable absorption mirror of wide band graphene, which sequentially comprises an optical substrate, a gold-plating reflection film and a graphene layer on the gold-plating reflection film from bottom to top. The saturated absorption mirror is simple in manufacture method and low in cost, overcomes the shortcoming that the SESAM is limited in band width and not compatible with different wave bands, successfully achieves mode-locked laser pulse output on mode-locked lasers on 1 micrometer band and 2 micrometer band, and is suitable for mode-locked and Q-switched lasers from near infrared band to medium and far infrared band. The saturable absorption mirror improves wavelength adaptation range and provides forceful support for production and application of ultra short pulse in different spectral regions.

A compact endfire tapered slot antenna, which may be advantageously printed on a low permittivity Liquid Crystal Polymer substrate. The antenna features a microstrip-to-slot transition, in which the matching stubs of the slotline antenna feed and the microstrip input line are collinear. This is achieved using a 90° bend in the slotline. The antenna is consequently of smaller size, and has improved bandwidth over prior art geometries. The antenna may be carried on a fork-shaped metallic carrier, which gives it good rigidity, and may incorporate a metallic reflector, which increases its directive gain. The antenna is simpler to manufacture and a less costly alternative to conventional 60-GHz tapered slot antennas printed on multilayer LTCC substrates. It can be used both as an individual radiator as well as an element of an antenna array and is readily integrated with an RF module for use in future WPAN applications.

Information services may be provided to a user of a personal digital assistant (PDA) via an infra red wireless communication port. The PDA recruits communication with a peer, such as a beacon, via this link, and the PDA and peer exchange messages containing the URLs of their proxies within the Internet. The proxies contact each other and negotiate, via the exchange of XML documents, parameters governing exchange of messages via the infra red link, such parameters being related inter alia to technical aspects of communication (e.g. file size, software compatibility etc.), encryption (e.g. public key information), and policy, which determines what the IR wireless link may be employed for, such as what content is sought. Negotiation between proxies is relatively rapid due to the higher bandwidth of the link between them in comparison to the IR link.

Embodiments of the present invention provide a way to modify the controller of a HDD head actuator to increase the error rejection capability and suppress the wideband vibration that affects the head motion. In one embodiment, a system to suppress influence of an external disturbance to an actuator comprises a controller providing a controller output as an actuator input to drive an actuator; a feedback loop to feed a head signal at an output of the actuator back as an input to the controller to produce an error signal; and a plurality of peak filters coupled to the controller and having different peak frequencies. Each peak filter has a peak filter input including the error signal, and has a peak filter output. A supervisor module is coupled with the peak filters to selectively add or delete the peak filter output of each peak filter to the actuator input to drive the actuator.

The invention relates to an acoustically coupled thin-film BAW filter, comprising a piezoelectric layer, an input-port on the piezoelectric layer changing electrical signal into an acoustic wave (SAW, BAW), and an output-port on the piezoelectric layer changing acoustic signal into electrical signal. In accordance with the invention the ports include electrodes positioned close to each other, and the filter is designed to operate in first order thickness-extensional TE1 mode.

In a bulk acoustic wave (BAW) filter based on laterally acoustically coupled resonators on piezoelectric thin films, one can utilize two distinct acoustic plate wave modes of different nature, for example the thickness extensional (longitudinal) TE1 and the second harmonic thickness shear (TS2) mode to form a bandpass response. The invention is based on the excitation of at least two lateral standing wave resonances belonging to different plate wave modes that facilitate the transmission of signal. The passband is designed by tailoring the wave propagation characteristics in the device such that the resonances are excited at suitable frequencies to form a passband of a desired shape. The bandwidth of the filter described herein may therefore be more than twice that of the existing state-of-the-art microacoustic filters. Consequently, it has significant commercial and technological value.

Information services may be provided to a user of a personal digital assistant (PDA) via an infra red wireless communication port. The PDA recruits communication with a peer, such as a beacon, via this link, and the PDA and peer exchange messages containing the URLs of their proxies within the Internet. The proxies contact each other and negotiate, via the exchange of XML documents, parameters governing exchange of messages via the infra red link, such parameters being related inter alia to technical aspects of communication (e.g. file size, software compatibility etc.), encryption (e.g. public key information), and policy, which determines what the IR wireless link may be employed for, such as what content is sought. Negotiation between proxies is relatively rapid due to the higher bandwidth of the link between them in comparison to the IR link.

The invention relates to improving the performance of load modulation power amplifiers through the use of coupled transmission line-based power combiners. Exemplary embodiments disclosed include a power amplifier comprising an input connected to first and second amplifier stages and an output stage configured to combine phase shifted amplified outputs from the first and second amplifier stages and to provide an amplified signal at an output of the power amplifier, wherein the output stage comprises coupled first and second transmission lines connected between the output of the first amplifier stage and an output load connection.

The invention discloses an LCD panel display driving system and a flexible printed circuit (FPC) thereof. The system comprises a host chip board, the FPC and an LCD panel which are connected in turn, wherein the input end of the FPC is connected with the host chip board through a mini low voltage differential signaling (LVDS) interface to perform data transmission; the output end of the FPC is connected with an integrated circuit in the LCD panel through two integrated FPC flat cable interfaces; and the inside of the FPC is provided with a gamma circuit. The LCD panel display driving system of the invention adopts the FPC with the miniLVDS interface so that the layout of the entire functional circuit is more reasonable, the circuit board on the back of the LCD panel can be eliminated and the connection ports and the product thickness can be reduced. Therefore, the manufacturing cost can be reduced more greatly, the electromagnetic interference on the product can be reduced more effectively; and the LCD panel is far from the back power supply emitting heat so as to have longer service life.

Embodiments of the present invention provide a way to modify the controller of a HDD head actuator to increase the error rejection capability and suppress the wideband vibration that affects the head motion. In one embodiment, a system to suppress influence of an external disturbance to an actuator comprises a controller providing a controller output as an actuator input to drive an actuator; a feedback loop to feed a head signal at an output of the actuator back as an input to the controller to produce an error signal; and a plurality of peak filters coupled to the controller and having different peak frequencies. Each peak filter has a peak filter input including the error signal, and has a peak filter output. A supervisor module is coupled with the peak filters to selectively add or delete the peak filter output of each peak filter to the actuator input to drive the actuator.

A broadband antenna for wireless communication system, the broadband antenna includes a radiating element, a grounding element and a connecting element for connecting the radiating element and the grounding element. The radiating element has a U-shaped structure, a V-shaped structure or an L-shaped structure. The broadband antenna of the present invention has wider frequency bandwidth and higher antenna efficiency.

An antenna device of the present disclosure includes: a dielectric layer; first and second conductor layers provided on both surfaces, respectively, of the dielectric layer; first and second antenna elements provided in the first conductor layer; a grounded conductor provided in the second conductor layer; and an EBG structure provided between the first and second antenna elements, wherein the EBG structure includes a first EBG portion provided in the first conductor layer, the first EBG portion including a plurality of first patch conductors electromagnetically coupled to the grounded conductor, and a second EBG portion provided in the second conductor layer, the second EBG portion including a plurality of second patch conductors electromagnetically coupled to the grounded conductor.

A lumped-element transmission line is formed in a multi-layered substrate. A mutual inductance between first and second inductors in a T-equivalent circuit model is enlarged to a designed positive value to widen the application frequency bandwidth of the transmission line. The second inductor is electrically connected to the first inductor in series at one end. The first and second inductors are spiral in shape and the orientations of the first inductor and the second inductor are the same so that the spirals progress in the same sense such that a mutual inductance between the first and second inductors is positive and equals a first value. A first capacitor is electrically connected to ground at a first end of the first capacitor, and a second end of the first capacitor is electrically connected to the end of the second inductor at which the second inductor in connected to the first inductor.

An antenna for use in a relatively small confined space, such as a mobile phone, is provided. In one example, the antenna includes a feeding arm having an end coupled to a feeding contact; and a grounded arm having an end coupled to a ground contact, wherein the feeding arm and the grounded arm are bent to conform to the relatively small confined volume. The relatively small confined volume can be internal space of a mobile communication device. The mobile communication device can be a mobile phone, for example.

A single sideband mixer is constructed with digital logic elements such as T-type flip-flops and inverters and with FETs, and the resulting mixer circuit simultaneously improves control over the frequency resolution, noise floor and operating frequency range. The use of this group of elements also allows the mixer circuit to be easily realized in an integrated circuit.

A multi-band antenna used in a portable electrical device can operate in WWAN. The multi-band antenna includes a PCB, a first antenna body, and a second antenna body. The PCB has a first surface and an opposite second surface and defines a through hole extending from the first surface to the second surface. The first antenna body is formed on the first surface of the PCB comprising a first radiating element and a first grounding element. The second antenna body is formed on the second surface of the PCB. The second antenna body comprises a second radiating element, a second grounding element, and a connecting element connecting the second radiating element and the second grounding element. The first radiating element and the second radiating element electrically connect with each other via the through hole of the PCB. A feeding line has an inner conductor electrically connecting to the first radiating element and an outer conductor electrically connecting to the first grounding element.

A boosting circuit is disclosed. The boosting circuit includes an input circuit part for outputting a differential current proportional to input voltages; a bias circuit part for mirroring the differential current, and producing an inverted differential current that the differential current is inverted; and an output circuit part for adjusting magnitudes of the differential current and the inverted differential current based on a predetermined ratio of MOS transistors, respectively, adding the adjusted differential current and inverted differential current, and producing an output current in a push-pull form. Accordingly, the boosting circuit has a broad maximum differentiable frequency bandwidth, and facilitates the adjustments of differentiation characteristics of an output current. Further, an amount of output current of differentiation form is not affected by external factors such as voltages, processes, temperatures, and so on.