摘要:
A filter with which it is possible to control the relationship between a pass band and an attenuation band. In this filter, for example, a single-stage trap filter is electrically connected to a three-stage band pass filter via a coupling capacitor. The trap filter has a serial resonance section composed of a resonator and a resonance capacitor. The serial resonance section is connected in parallel to a capacitive reactance element (capacitor), and a serial circuit composed of an inductive reactance element (inductor) and a PIN diode as a switching element. The capacitive reactance element and the inductive reactance element both serve to make an admittance of the trap circuit substantially zero.
摘要:
An antenna-duplexer and communication apparatus in which relative phase distortion of transmitted waves and intrusive waves is low, and which are small-scale. An antenna-duplexer comprises a transmission side circuit, electrically connected between a transmission terminal and an antenna terminal, and a reception side circuit, electrically connected between a reception terminal and the antenna terminal. Two PIN diodes, which are connected in series, are connected only to a resonator of the transmission side circuit which is electrically connected closest to the antenna terminal, and a voltage control terminal is connected to the anodes of the PIN diodes, thereby dividing the high-frequency voltage. One PIN diode is connected to each of the other resonators.
摘要:
An outer conductor, an input terminal electrode, an output terminal electrode, a voltage controllable terminal electrode, and two separated electrodes are formed on the outer face of a dielectric block. Furthermore, on the upper face of the dielectric block, PIN diodes which are voltage controllable reactance elements, and inductors for voltage-controlling the PIN diodes, and a coupling adjustment capacitor are mounted. Frequency shifting capacitors are formed by generation of electrostatic capacitances between the separated electrodes and the inner conductors of the resonance holes, respectively.
摘要:
A frequency variable filter in which both the frequency of an attenuation pole and the attenuation bandwidth can be varied. In the frequency variable filter, two serial resonance sections composed of resonators and resonance capacitors are electrically connected to each other via a capacitor. The respective resonator in each of the serial resonance sections is electrically connected in parallel with a corresponding serial circuit composed of a frequency shifting capacitor and a PIN diode. A coupling capacitor electrically connects the junctions defined respectively between the frequency shifting capacitor and the PIN diode in each of the serial circuits.
摘要:
There is provided a frequency-variable-type filter, comprising: a voltage control terminal; at least one resonator; a switching device for being switched on/off by a control voltage supplied to the voltage control terminal; and the switching device being in the off-state, when a control circuit as an external circuit which is electrically connected to the voltage control terminal has high impedance at 0 V.
摘要:
According to one embodiment, an information processing apparatus, includes a changing unit which, if a command transmitted from a short-distance wireless communications terminal by pushing down a volume control button is received in a standby status in which the short-distance wireless communications terminal makes no connection with the Internet Protocol telephone communications network, changes selection of the telephone number stored in a memory unit, and a calling unit which, if a command transmitted from the short-distance wireless communications terminal by pushing down a call button is received after the changing process of the changing unit, calls the selected telephone number.
摘要:
A drive circuit for a flat display apparatus is disclosed wherein different display objects can be displayed at a time individually with appropriate gamma characteristics. Reference voltages are produced in a plurality of systems having different gamma characteristics from each other, and one of the systems is selected in response to a selection signal. Then, the reference voltages of the selected system are selected in response to image data to set gradations of pixels.
摘要:
To provide an ink jet recording sheet for plate-making mask film, which has good exposure characteristics and which presents good air release when contacted with a photosensitive resin plate under reduced pressure. An ink jet recording sheet for plate-making mask film, which comprises a substrate sheet and a porous layer formed thereon and has a total luminous transmittance of at least 70% as stipulated by JIS-K7361-1, wherein the porous layer comprises 100 parts by mass of inorganic particles selected from the group consisting of alumina, alumina hydrate, silica and a silica-alumina composite and having an average particle size of at most 250 nm, from 1 to 30 parts by mass of a binder and from 0.1 to 3 parts by mass of porous particles having an average particle size of from 4 to 15 μm and has a thickness of from 5 to 50 μm and an Oken type smoothness of from 200 to 10,000 seconds as stipulated by J. TAPPI No. 5-2.
摘要:
A drive circuit for a flat display apparatus is disclosed wherein different display objects can be displayed at a time individually with appropriate gamma characteristics. Reference voltages are produced in a plurality of systems having different gamma characteristics from each other, and one of the systems is selected in response to a selection signal. Then, the reference voltages of the selected system are selected in response to image data to set gradations of pixels.
摘要:
Grooves are formed on the connection faces of the dielectric basic plates as a dielectric resonator, and also, an internal conductor is provided on the inside face, and coupling electrodes are formed on the other dielectric basic plate. These three dielectric basic plates are connected so that the coupling electrode effects capacity connection between internal conductors and the coupling electrode effects capacity connection between the internal conductors, whereby an earth electrode (external conductor) can be formed on almost full face on the reverse face side of the dielectric basic plate and the reduction of Qo of the resonator and the electromagnetic field leakage can be prevented.