摘要:
In a laminated dielectric resonator, a two-fold strip line is formed and resonant frequency is lowered. Accordingly, the length of the resonator is reduced, and the length of the strip line becomes shorter than one fourth of the wavelength with the lowered resonant frequency, which leads to further reduction of the length of the resonator. By lowering the resonant frequency, dielectric material with less relative permittivity can be used, with a result of resonator with high unloaded Q and excellent temperature characteristic. Further, at least one coupling electrode is formed as external or internal electrode to compose a capacitor together with a second strip line, and a laminated dielectric resonator is connected to an external circuit via the coupling electrode. A dielectric filter such as band pass filter, band elimination filter is so composed that the dielectric resonators are cascade-connected to one another. In the thus constructed dielectric filter, external coupling capacitors are unnecessary, reducing the number of parts and facilitating the manufacturing process. Thus, a small-sized, low-cost dielectric filter is attained.
摘要:
An antenna switching apparatus for selectively connecting an antenna to either a transmitter for transmitting a transmitting signal having a transmitting frequency, or a receiver for receiving a receiving signal having a receiving frequency, which is different from the transmitting frequency, includes an antenna terminal electrically connected to the antenna; a transmitting terminal electrically connected to the transmitter, and a receiving terminal electrically connected to the receiver. A receiving filter for passing a receiving signal therethrough is electrically connected between the antenna terminal and the receiving terminal. An impedance adjusting element is electrically connected to an input end of the receiving filter, and has an element value such that an impedance when seen from the antenna terminal looking toward the receiving filter becomes substantially infinity at the transmitting frequency. Further, a switching device is electrically connected between the antenna terminal and the transmitting terminal, wherein it is turned on or off in response to a control signal.
摘要:
A small and thin plane type narrow-band dielectric filter to be used for a portable telephone and the like, includes a plurality of end short-circuited strip line resonators having a length of about quarter-wavelength formed parallel and closely to each other on a first dielectric substrate and directly magnetically coupled to each other. The thus formed strip line resonators are partially bonded to parallel plane capacitor electrodes formed on a second dielectric substrate in respective overlapping areas thereby electrically coupling the strip line resonators through the parallel plane capacitors, so that the inter-resonator coupling can be reduced due to the fact that it is achieved in combination with the magnetic coupling and the electrical coupling.
摘要:
A transmission line type resonator has a low-loss characteristic and, in order to realize the low-loss characteristic, the transmission line type resonator includes a laminate body formed of a plurality of dielectric sheets, a transmission line of complex right hand left hand system disposed between the plurality of dielectric sheets, and an external connection terminal disposed at the end face of the transmission line type resonator and connected with the transmission line of complex right hand left hand system.
摘要:
A radio frequency amplifier circuit according to the present invention is for providing a radio frequency amplifier circuit with high output and high efficiency, and includes (i) a first harmonic processing circuit (102) and (ii) a second harmonic processing circuit (103) which are connected to an output terminal of transistors (101), and a (iii) fundamental matching circuit (104) connected to a downstream of the first harmonic processing circuit (102) and the second harmonic processing circuit (103). The radio frequency amplifier circuit includes plural first harmonic processing circuits (102) and plural second harmonic processing circuits (103).
摘要:
The present invention relates to a resonator device having a stacked arrangement of laminated layers including a plurality of dielectric layers, and at least one resonator comprising a short-circuit electrode, a first capacitor electrode and a second capacitor electrode. Each electrode comprises at least a portion of a layer of electrically conductive material provided on a surface of one of the dielectric layers. The second capacitor electrode is disposed spaced, in the stacking direction, from the short-circuit electrode and the first capacitor electrode. The short-circuit electrode and the second capacitor electrode are electrically interconnected by a first electrical connection comprising at least one via hole penetrating one or more of the dielectric layers.
摘要:
The resonator includes first high-impedance wiring plate-like, arranged parallel to top-surface ground electrode; second high-impedance wiring plate-like, arranged so as to face first high-impedance wiring; first columnar conductor electrically connecting first high-impedance wiring to second high-impedance wiring; first low-impedance wiring arranged between first high-impedance wiring and second high-impedance wiring; second columnar conductor electrically connecting first high-impedance wiring to first low-impedance wiring; second low-impedance wiring arranged between first low-impedance wiring and second high-impedance wiring; and third columnar conductor electrically connecting second high-impedance wiring to second low-impedance wiring, to reduce the area size the resonator.
摘要:
A series piezoelectric resonator 11 is connected in series between an input terminal 15a and an output terminal 15b. A first electrode of a parallel piezoelectric resonator 12a is connected to a connection point between the input terminal 15a and the series piezoelectric resonator 11, and a second electrode of the parallel piezoelectric resonator 12a is connected to a first terminal of an inductor 13a. A first electrode of a parallel piezoelectric resonator 12b is connected to a connection point between the series piezoelectric resonator 11 and the output terminal 15b, and a second electrode of the parallel piezoelectric resonator 12b is connected to a first terminal of an inductor 13b. Second terminals of the inductors 13a and 13b are grounded. An additional piezoelectric resonator 14 is connected between the second electrode of the parallel piezoelectric resonator 12a and the second electrode of the parallel piezoelectric resonator 12b.
摘要:
A dielectric resonator has a metallic casing having an opening, a metallic cover which covers the opening, and a dielectric resonance element having a pair of flat surfaces formed opposite from each other, one of the pair of flat surfaces being brought into contact with a bottom portion of the casing. At least one of the cover and the bottom portion has a resilient portion which supports the dielectric resonance element and presses one of the pair of flat surfaces by a biasing force so as to follow expansion or contraction of the dielectric resonance element due to a change in temperature. The biasing force applied from the resilient portion is obtained by warping of a portion of the cover or a portion of the bottom portion that one of the pair of flat surfaces or an edge portion of the flat surface contacts.
摘要:
To realize high pressure-tightness and improvement in a high-frequency characteristic due to a low impedance between a shunt FET and a ground of a FET switch circuit. An antenna switch module comprising a switch circuit for switching between transmitting and receiving of a signal between an antenna and a transmitting portion and/or a receiving portion and having a shunt circuit, wherein a capacitor of the shunt circuit of the switch circuit is provided to a dielectric layered body, and remaining elements of the switch circuit are provided to semiconductor chips mounted on the dielectric layered body.