摘要:
A boundary acoustic wave device includes an electrode structure that is provided at the interface between a piezoelectric substrate and a dielectric layer. The electrode structure defines a ladder filter in which at least two ground pads of a plurality of ground pads, to be connected to a ground potential, provided on the piezoelectric substrate are electrically connected by a connection conductor provided on the dielectric layer, and all of the ground pads are electrically connected.
摘要:
An acoustic wave filter device has a balance-unbalance conversion function and has an increased out-of-band attenuation. The acoustic wave filter device includes a 5-IDT-type longitudinally coupled resonator-type acoustic wave filter unit including IDTs that are connected between an unbalanced terminal and first and second balanced terminals, and the IDTs and are connected to the first and second balanced terminals, respectively, that is arranged between the unbalanced terminal and the first and second balanced terminals. A second ground wiring that connects the end portions of the unbalanced-side IDT on the side connected to the ground potential to a ground terminal is separated from a first ground wiring. The second ground wiring includes first and second branched wiring portions, and the first and second branched wiring portions are arranged so as to sandwich an area in which the IDTs are provided.
摘要:
An oscillator, a dielectric waveguide device and a transmitter incorporating the same, wherein a special temperature-compensating circuit provides a temperature-compensated device with reduced size and cost, and greater productivity. In the oscillator, a dielectric plate having a strip line of a specified length is arranged between conductive plates which enclose a Gunn diode. The oscillation output signal of the Gunn diode is extracted via the strip line. In addition, the sign of the dielectric-constant temperature coefficient of the dielectric plate is set such that changes in the oscillation frequency caused by changes in temperature of the Gunn diode are suppressed.
摘要:
In an acoustic wave filter, first and second filter elements are connected between an unbalanced terminal and first and second balanced terminals on an acoustic wave substrate. The filter elements are longitudinally-coupled surface wave filters including at least three IDTs. One end of the IDTs is mutually connected and is connected to the unbalanced terminal. The other ends of the IDTs are connected by a second connecting line so as to define an unbalanced-side grounded portion. Grounded ends of the IDTs are connected to each other by a first connecting line so as to define a common midpoint grounded portion. The common midpoint grounded portion and the unbalanced-side grounded portion are electrically separated from each other.
摘要:
A voltage controlled oscillator, a voltage controlled oscillator device, and a radar device provided therewith which can detect when the oscillation frequency becomes uncontrollable. According to one embodiment, a Gunn or other oscillation device is connected to a main line and a varactor diode which is a variable reactance element is connected between the main line and a sub line to constitute a voltage controlled oscillator. A control voltage is applied to the varactor diode via a switching circuit, and the presence or absence of oscillation or a failure of the varactor diode or oscillation device is detected by a detection signal, for example, from the varactor diode as monitored by a voltage monitor, and/or from the oscillation device, as monitored by a current sensing device.
摘要:
An acoustic transducer unit that includes (a) an acoustic transducer having an acoustic transducer portion that converts sound into an electrical signal or converts an electrical signal into sound, and (b) packages that accommodate the acoustic transducer. The packages include a cylindrical conductive portion formed of a conductive material and having an inner space with both end apertures. At least the acoustic transducer portion of the acoustic transducer is located in the inner space of the conductive portion such as to be spaced from the apertures.
摘要:
An oscillation circuit is constructed by providing a line and a Gunn diode on a dielectric substrate, and an oscillation signal as the fundamental frequency signal of an oscillator is injected into the Gunn diode through a DC bias line. By disposing a dielectric stripline between upper and lower conductor plates, at NRD guide as an output transmission line is constructed, and the line and the NRD guide are coupled. The cutoff frequency of the NRD guide is determined so that the fundamental wave component of oscillation signal of the oscillation circuit is cut off and a harmonic is propagated.
摘要:
An oscillation circuit is constructed by providing a line, a Gunn diode, and a dielectric resonator on a dielectric substrate; by disposing a dielectric stripline between upper and lower conductor plates to form an NRD guide which serves as a output transmission line; and the line and the NRD guide are coupled.
摘要:
A boundary acoustic wave device includes an electrode structure that is provided at the interface between a piezoelectric substrate and a dielectric layer. The electrode structure defines a ladder filter in which at least two ground pads of a plurality of ground pads, to be connected to a ground potential, provided on the piezoelectric substrate are electrically connected by a connection conductor provided on the dielectric layer, and all of the ground pads are electrically connected.
摘要:
An acoustic wave filter device has a balance-unbalance conversion function and has an increased out-of-band attenuation. The acoustic wave filter device includes a 5-IDT-type longitudinally coupled resonator-type acoustic wave filter unit including IDTs that are connected between an unbalanced terminal and first and second balanced terminals, and the IDTs and are connected to the first and second balanced terminals, respectively, that is arranged between the unbalanced terminal and the first and second balanced terminals. A second ground wiring that connects the end portions of the unbalanced-side IDT on the side connected to the ground potential to a ground terminal is separated from a first ground wiring. The second ground wiring includes first and second branched wiring portions, and the first and second branched wiring portions are arranged so as to sandwich an area in which the IDTs are provided.