摘要:
An RF device, has a first substrate made of a material with a lower relative dielectric constant and having a high frequency circuit formed therein or on a surface thereof; and a second substrate made of a material with a higher relative dielectric constant, wherein at least a part of a filter is provided in, on a surface of or in the vicinity of the second substrate and connected to the high frequency circuit, and the high frequency circuit is composed of an element other than the part of the filter.
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 first 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 first parallel piezoelectric resonator (12a) is connected to a first terminal of a first inductor (13a). A first electrode of a a second 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 second parallel piezoelectric resonator (12b) is connected to a first terminal of a second inductor (13b). Second terminals of the inductors (13a,13b) are grounded. An additional piezoelectric resonator (14) is connected between the second electrode of the first parallel piezoelectric resonator (12a) and the second electrode of the second parallel piezoelectric resonator (12b).
摘要:
A small in-band-flat-group-delay type dielectric filter having low-loss characteristics with a small amplitude deviation and uniform-group-delay frequency characteristics is obtained, which enables broad-band characteristics to be obtained easily. The in-band-flat-group-delay type dielectric filter includes a plurality of dielectric coaxial resonators 14, 15, a coupling circuit comprising a combination of reactive elements, with which the dielectric coaxial resonators 14, 15 are coupled to one another, and input/output terminals 11 connected to ends of the coupling circuit. The dielectric coaxial resonators 14 coupled to the input/output terminals 11 are allowed to have a different characteristic impedance from that of the interstage dielectric coaxial resonators 15.
摘要:
A piezoelectric resonator of the present invention is structured such that on a substrate (5) having a cavity (4) formed therein, a lower electrode (3), a piezoelectric body (1), a spurious component control layer (16) , and an upper electrode (2) are formed in this order frombottomup. The spurious component control layer (16) is a layer for controlling a spurious frequency, and composed of, for example, a metallic material, a dielectric material, or a piezoelectric material. By additionally providing the spurious component control layer (16), it is made possible to cause variation of the spurious frequency due to unwanted variation to become greater than variation in resonance frequency of the main resonance of the piezoelectric resonator. Thus, it is possible to realize a piezoelectric resonator having an admittance frequency response where no spurious component occurs between resonance frequency fr and antiresonance frequency fa.
摘要:
A piezoelectric resonator of the present invention is structured such that on a substrate (5) having a cavity (4) formed therein, a lower electrode (3), a piezoelectric body (1), a spurious component control layer (16) , and an upper electrode (2) are formed in this order frombottomup. The spurious component control layer (16) is a layer for controlling a spurious frequency, and composed of, for example, a metallic material, a dielectric material, or a piezoelectric material. By additionally providing the spurious component control layer (16), it is made possible to cause variation of the spurious frequency due to unwanted variation to become greater than variation in resonance frequency of the main resonance of the piezoelectric resonator. Thus, it is possible to realize a piezoelectric resonator having an admittance frequency response where no spurious component occurs between resonance frequency fr and antiresonance frequency fa.
摘要:
A dielectric filter capable of operating with stability even when a change in temperature occurs, and a method of supporting a dielectric resonance element of the dielectric filter. 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 bottomportion of the casing. At least one of the cover and the bottomportion 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 resilientportion is obtainedbywarping 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:
The invention provides a dielectric filter including a metal case having an opening in the upper part, a metal lid of closing the opening, a dielectric resonance element placed on the internal bottom face of the case through a support, a bolt made of dielectric material inserted in a position in the lid corresponding to the dielectric resonance element, and a metal plate placed at the end of the bolt substantially in parallel with the upper face of the dielectric resonance element, wherein the position of the bolt is adjusted to change the space between the dielectric resonance element and the plate, whereby the resonance frequency is controlled.
摘要:
A multilayer electronic component has a multilayered product laminating a plurality of dielectric sheets as one piece, a plurality of grounded electrodes provided among the dielectric sheets being different inside the multilayered product, and inductor electrodes provided on the dielectric sheet surfaces not having the plurality of grounded electrodes inside the multilayered product, wherein all or part of the inductor electrodes are placed so as not to be sandwiched by the plurality of grounded electrodes.
摘要:
The present invention relates to a piezoelectric resonator including: a substrate; a lower electrode (103) provided on or above the substrate; a piezoelectric member (101) provided on or above the lower electrode; an upper electrode (102) provided on or above the piezoelectric member; and a cavity (104) provided below a vibration member consisting of the lower electrode, the piezoelectric member, and the upper electrode. In the case where a resonance frequency of vibration with a thickness of the vibration member being a half of a wavelength is taken as fr1, an average of ultrasonic velocity in a material forming the cavity is taken as Vc2, and a value determined based on the resonance frequency fr1 and the average of ultrasonic velocity Vc2 is λc (=Vc2/fr1), a depth t2 of the cavity is set as shown below, (2n-1) × λc 4 - λc 8 ≦ t 2 ≦ (2n-1) × λc 4 + λc 8 , where n is an arbitrary natural number.