Plane superconductive microstrip resonator

Wideband acoustic surface-wave switching filter set

Surface acoustic wave filter bank having trap function

The invention relates to a surface acoustic wave filter bank having a trap function, which comprises a one-level surface acoustic wave filter bank and a gate circuit, wherein the one-level surface acoustic wave filter bank comprises a group of broadband surface acoustic wave filters and two groups of single-pole multi-throw switches; the two groups of single-pole multi-throw switches are respectively electrically connected with an input end or an output end of the group of broadband surface acoustic wave filters; the two groups of single-pole multi-throw switches are in one-to-one correspondence; the gate circuit is respectively electrically connected with the two groups of single-pole multi-throw switches; an input end or an output end of the one-level surface acoustic wave filter bank isconnected with at least one surface acoustic wave trap filter in series; the surface acoustic wave trap filter is formed by connecting two one-terminal pair surface acoustic wave resonators which areconstructed ...

Switchable surface acoustic wave filter bank with two channel bandwidths

The invention relates to a switchable filter group of surface acoustic wave having two channel bandwidths, which comprises a multi-fling switch, a controller and a plurality of filters of surface acoustic wave and is characterized in that: a plurality of filters of surface acoustic wave form at least a narrow-band channel and a wide-band channel; the narrow-band channel comprises two concatenated filters of surface acoustic waves which both apply unidirectional transducer structures of single-phase made on quartz; the wide-band channel comprises two concatenated different filters of surface acoustic wave, wherein, a pre-stage filter of surface acoustic wave applies a vertical coupling structure of a resonate filter, and a last-stage filter of surface acoustic wave applies a structure of a sector filter. The invention can realize low insertion loss in the narrow-band channel and also realize low rectangle coefficient; at the same time, the invention can realize low insertion loss in the ...

Plane high temperature super conductive microstrip resonator with low electromagnetic radiation

Switchable surface acoustic wave filter bank with two channel bandwidths

Method for detecting and optimizing plane superconducting microstrip resonator

The invention relates to a planar superconductive microstrip resonator, comprising a microstrip composed by upper and lower layer superconductive films and an artificial monomorph medium between the two layers of the superconductive films; be in characteristics that the microstrip is a complete shoestring, forming a geometrical pattern with an inner ring and an outer ring; the inner ring and the outer ring are not sealed. The advantages of the invention are following: the parasitical coupling is significantly weakened; the structure is more compact; because of the structure of the inner ring and the outer ring and the reverse direction of the inner ring and the outer ring, when the resonators of the invention are combined together, the coupling between the resonators is relevantly weak; in order to satisfy a certain coupling relation, the resonators must get closer; the integral structure can be more compact in this way;; furthermore, the distant field weak coupling means the significantly ...

Single-mode protruding double-end resonant surface acoustic wave detector

The invention relates to a single-mode protruding double-end resonant surface acoustic wave detector, which comprises three interdigital transducers and two metal reflecting grating arrays on a piezoelectric chip. The three interdigital transducers are arranged with identical spacing of 0-100 time(s) of the wavelength (0.25) of the interdigital transducers; the spacing between the first metal reflecting grating array and an adjacent first interdigital transducer thereof is identical to the spacing between the second metal reflecting grating array and an adjacent third interdigital transducer thereof, and the spacing is 1-10 time(s) of the wavelength (0.25) of the interdigital transducers; and the synchronous frequencies of the three interdigital transducers are identical and are 0.95-1.05time(s) of the synchronous frequency of the metal reflecting grating arrays, and the energy amplitude difference of two vertical modes in the frequency response curve is more than 5dB. The surface acoustic ...

Method for improving frequency stability of sound surface wave oscillator

The invention relates to a method for improving frequency stability of a sound surface wave oscillator. The method comprises the following steps of: 1) testing a frequency response curve of a sound surface wave detector, finding a frequency point with lowest loss in a pass band, and measuring the phase phi D of the frequency point; 2) taking a phase condition formula phi D + phi E = 2npi (n is integer) that an oscillating loop can produce oscillation, substituting the phi D obtained in the step 1 into the formula, and calculating the phase shift phi E of a circuit part of the oscillating loop; and 3) adjusting a phase shift network of the circuit part of the oscillating loop to make the phase shift of the circuit part of the oscillating loop meet the phi E obtained in the step 2) so as to finish phase matching. The phase matching can be finished by using a phase shifter or a cable. The method provided by the invention can obviously improve the frequency stability of the sound surface wave ...

Method for detecting and optimizing plane superconducting microstrip resonator

The invention relates to a planar superconductive microstrip resonator, comprising a microstrip composed by upper and lower layer superconductive films and an artificial monomorph medium between the two layers of the superconductive films; be in characteristics that the microstrip is a complete shoestring, forming a geometrical pattern with an inner ring and an outer ring; the inner ring and the outer ring are not sealed. The advantages of the invention are following: the parasitical coupling is significantly weakened; the structure is more compact; because of the structure of the inner ring and the outer ring and the reverse direction of the inner ring and the outer ring, when the resonators of the invention are combined together, the coupling between the resonators is relevantly weak; in order to satisfy a certain coupling relation, the resonators must get closer; the integral structure can be more compact in this way;; furthermore, the distant field weak coupling means the significantly ...

Single-mode protruding double-end resonant surface acoustic wave detector

The invention relates to a single-mode protruding double-end resonant surface acoustic wave detector, which comprises three interdigital transducers and two metal reflecting grating arrays on a piezoelectric chip. The three interdigital transducers are arranged with identical spacing of 0-100 time(s) of the wavelength (0.25) of the interdigital transducers; the spacing between the first metal reflecting grating array and an adjacent first interdigital transducer thereof is identical to the spacing between the second metal reflecting grating array and an adjacent third interdigital transducer thereof, and the spacing is 1-10 time(s) of the wavelength (0.25) of the interdigital transducers; and the synchronous frequencies of the three interdigital transducers are identical and are 0.95-1.05 time(s) of the synchronous frequency of the metal reflecting grating arrays, and the energy amplitude difference of two vertical modes in the frequency response curve is more than 5dB. The surface acoustic ...

Method for improving frequency stability of sound surface wave oscillator

The invention relates to a method for improving frequency stability of a sound surface wave oscillator. The method comprises the following steps of: 1) testing a frequency response curve of a sound surface wave detector, finding a frequency point with lowest loss in a pass band, and measuring the phase phi D of the frequency point; 2) taking a phase condition formula phi D + phi E = 2npi (n is integer) that an oscillating loop can produce oscillation, substituting the phi D obtained in the step 1 into the formula, and calculating the phase shift phi E of a circuit part of the oscillating loop; and 3) adjusting a phase shift network of the circuit part of the oscillating loop to make the phase shift of the circuit part of the oscillating loop meet the phi E obtained in the step 2) so as to finish phase matching. The phase matching can be finished by using a phase shifter or a cable. The method provided by the invention can obviously improve the frequency stability of the sound surface wave ...