64 results about "Frequency coverage" patented technology

The invention relates to a double-frequency filtering metasurface design method based on topological optimization. The method comprises the following steps: establishing a two-dimensional simulation model comprising a double-frequency filtering metasurface matrix and a scatterer; according to a preset target forbidden band, taking a forbidden band frequency covering frequency doubling target interval as a fitness function, coding the binary matrix representing material distribution as a chromosome to perform optimization iteration of the chromosome, and obtaining the chromosome with the maximum fitness function value; in optimization iteration, material distribution corresponding to chromosomes is constructed on a two-dimensional simulation model, an energy band structure of the two-dimensional simulation model is obtained, and a fitness function value is calculated; and according to the binary matrix of the chromosome with the maximum fitness function value, outputting final optimized material distribution of the double-frequency filtering metasurface, and performing performance verification on a result through simulation to obtain the double-frequency filtering metasurface of which a fundamental frequency wave can be blocked through a double-frequency wave. Compared with the prior art, systematic optimization of the frequency doubled sound filtering scene is realized.

The invention discloses a bow net offline electromagnetic interference multichannel data acquisition and analysis method and device, and belongs to the technical field of electromagnetic interference test and analysis. A transient electromagnetic signal of pantograph-catenary discharge is acquired through cooperation of multiple antennas, multiple probes and multiple channels, and strict alignment of multi-source data under the same discharge event is realized through unified triggering and time base line unification; in the off-line stage, denoising, feature extraction and multi-event statistical modeling are carried out on data generated by triggering, so that multi-path and multi-mode electromagnetic characteristics of pantograph-catenary discharge and statistical laws of the multi-path and multi-mode electromagnetic characteristics of pantograph-catenary discharge are obtained; the device comprises a data acquisition unit, a synchronous trigger unit, an analysis processing unit and an interactive display unit, and can improve data processing efficiency and analysis depth while ensuring high sampling rate and broadband coverage; the device solves the problems of insufficient space coverage, poor synchronism and limited analysis capability in the existing pantograph-catenary discharge test, and is suitable for pantograph-catenary discharge mechanism research, electromagnetic interference evaluation and related engineering application.

A transportable ultra-wideband frequency spectrum monitoring and direction finding device relates to the technical field of radio direction finding and comprises a plurality of direction finding antenna arrays including a first amplitude comparison direction finding antenna array, a second amplitude comparison direction finding antenna array, a virtual baseline direction finding antenna array, a five-element interferometer direction finding antenna array and a Wattson-Watt direction finding antenna array. The plurality of switch matrix networks are respectively connected with the corresponding direction-finding antenna arrays and are used for switching multiple paths of antenna signals and injecting calibration signals; the plurality of down-conversion board cards are respectively connected with the corresponding switch matrix networks and are used for converting the radio frequency signals of different frequency bands into intermediate frequency signals through multi-stage frequency conversion processing; the digital receiver is connected with the plurality of down-conversion board cards and is used for carrying out direct acquisition and channelization processing on the intermediate frequency signals; and an industrial personal computer. The method and the device are used for solving the problems of limited frequency coverage range, limited lateral azimuth coverage range and limited receiving dynamic range of traditional lateral equipment.

This application provides an earphone and a terminal device. The earphone includes a housing with a cavity structure inside, and a sound outlet communicating with the cavity structure. A first sound unit, a second sound unit, and a third sound unit are disposed within the cavity structure, and the third sound unit is a microelectromechanical system (MEMS) unit. The sound frequency of the second sound unit is greater than but less than the sound frequency of the first sound unit. The third sound unit, being a MEMS unit, is located between the first sound unit and the sound outlet. By incorporating the first sound unit, the second sound unit, and the MEMS unit within the earphone, the output bandwidth of the earphone can be fully guaranteed, achieving better full-frequency coverage and superior sound quality.

The invention provides a novel dual-frequency dual-circularly polarized satellite antenna, and relates to the technical field of satellite antennas. The satellite antenna comprises a ground plane, a single-feed-point coaxial line, a dielectric substrate and a metal patch connected to the dielectric substrate. A gap layer is arranged between the ground plane and the dielectric base. The single-feed-point coaxial line passes through the gap layer and the dielectric substrate so as to be electrically connected with the ground plane and the metal patch. The metal patch comprises a circular patch on the inner layer and a rectangular patch arranged on the outer layer of the circular patch in a sleeving mode. The circular patch is provided with a rectangular groove so as to realize right-handed circular polarization. Two opposite sides of the rectangular patch are respectively provided with a long branch knot and a short branch knot so as to realize left-hand circular polarization. The four corners or the positions close to the four corners of the rectangular patch are electrically connected to the circular patch. The antenna has good dual-frequency coverage, circular polarization characteristic and gain performance in the L and S frequency bands.

The present disclosure belongs to the technical field of antennas. Provided are a panel antenna and an electronic device, which can solve the problems of existing panel antennas, such as low aperture efficiency, uneven radiation amplitude, difficulty in achieving multi-frequency coverage. The panel antenna in the present disclosure comprises a waveguide structure, a first dielectric substrate, a radiation layer and a plurality of switch units, wherein the radiation layer has a plurality of slit openings; the switch units are arranged so as to correspond to the slit openings on a one-to-one basis, and are configured to control whether the slit openings corresponding thereto are open / closed; the radiation layer is divided into a middle region and a peripheral region; and the slit openings located in the middle region among the plurality of slit openings are divided into a plurality of groups, each group of said slit openings comprises at least a plurality of first slit openings, at least some of the first slit openings located in different groups have different sizes, and the closer a group of slit openings to the centre of the middle region, the larger the size of the first slit openings in said group of slit openings. The panel antenna in the present disclosure has the advantages of high aperture efficiency, multi-frequency coverage and even radiation amplitude.

The application discloses a sound field partition control method, electronic equipment and a vehicle. The sound field partition control method comprises the following steps: based on a plurality of target audio signals, a plurality of loudspeakers with different frequency coverage ranges in a target sound field control area are controlled; wherein the plurality of target audio signals are obtained based on an original audio signal and a plurality of different sound field partition control algorithms. The method can combine the advantages and limitations of a plurality of different sound field partition control algorithms, select a suitable sound field partition control algorithm to process the original audio signal, so that the target audio signal can take into account more optimization characteristics, and improve the listening experience and audio comfort.

The invention provides a fusion antenna, and relates to the technical field of antennas. The fusion antenna comprises a Vivaldi type antenna unit and a TEM horn radiation unit. An open slot line is arranged on a polar plate of the Vivaldi type antenna unit; the size of the open slot line is the same as that of radiation polar plates which are symmetrically distributed based on a central axis in the TEM horn radiation unit; a feed end of a radiation polar plate in the TEM horn radiation unit is inserted into the Vivaldi type antenna unit along the open slot line, and a radiation end extends out of the open slot line; and the center line of the radiation polar plate in the TEM horn radiation unit is overlapped with the open slot line. According to the invention, the Vivaldi-type antenna and the TEM horn radiation antenna are fused, the advantages of the Vivaldi-type antenna and the TEM horn radiation antenna are combined, the transmission stability is high, and the broadband coverage capability is improved.

The utility model relates to the field of radio transceiving, and discloses an ultra-wideband extremely-small-step frequency hopping frequency synthesizer module. According to the invention, the high-speed dot frequency array divides an ultra-wideband frequency 9-18GHz signal into 8 segments, and the 8 segments are respectively shifted and converted to 1000-2200MHz for frequency and phase discrimination, so that the phase discrimination frequency is greatly reduced, excellent phase noise can be obtained, and ultra-wideband frequency coverage is realized at the same time. The adopted high-speed dot frequency phase-locked array is low in phase noise and large in frequency span coverage, the switching time is short through a high-speed switch, large-range fast frequency hopping can be achieved, and powerful support is provided for prolonging the large-range frequency hopping time of a whole circuit system. A DDS direct digital frequency synthesis circuit is adopted, near-end stray is low, high-frequency resolution is provided, and extremely low frequency stepping can be achieved. And the frequency hopping speed is high and reaches below 1uS, so that the rapid frequency hopping of the frequency synthesizer system can be realized.

The invention relates to a 5GNTN low earth orbit satellite frequency conversion device for realizing broadband coverage, which comprises a reference clock unit, a frequency conversion unit, a local oscillation leakage suppression unit, a gain selection control unit and a frequency synthesis control unit, and is characterized in that the output end of the reference clock unit is connected with the input end of the frequency conversion unit; the output end of the frequency conversion unit is connected with the input end of the local oscillation leakage suppression unit, the output end of the local oscillation leakage suppression unit is connected with the input end of the gain selection control unit, and the output end of the gain selection control unit is connected with the input end of the frequency synthesis control unit. By adopting the 5GNTN low earth orbit satellite frequency conversion device for realizing broadband coverage, through the design of broadband and large dynamic gain, the requirement of frequency coverage of a 5G NTN low earth orbit satellite from an s wave band to a ka wave band at present is met, and meanwhile, an effective and broadband coverage frequency conversion means can be provided for navigation satellites, military satellites and the like.

Multi-band remotely configurable tuning probes for slide screw impedance tuners allow instantaneous larger frequency coverage beyond the capacity of existing tuning probes using the single horizontal and vertical axis mechanism of a prior art single probe, single band tuner. This is done by carving multiple slugs of different length and frequency coverage as segments of a disc-shaped revolving slab, which rotates inside the legs of a captive unit and locks at distinct angles. The captive unit is attached to the vertical control mechanism of the tuner and rotation is ensured using multiple traverse lateral studs on the disc unit and a set of vertical studs on the slabline close to the idle port of the tuner. An automated procedure ensures remote switching between tuning slugs. Calibration and tuning is as in prior art single probe tuners.

An automatic-reconstruction extensible multi-channel array receiver comprises a receiver body and is characterized in that the receiver body is of a layered structure and is sequentially provided with a basic module and N extension modules from bottom to top, and the N extension modules comprise at least one channel extension module and at least one frequency extension module; a first power supply conditioning circuit is arranged in the basic module, second power supply conditioning circuits are arranged in the expansion module, and the first power supply conditioning circuit is connected with each second power supply conditioning circuit through a power supply bus; a first digital control circuit is further arranged in the basic module, second digital control circuits are further arranged in the expansion module, and the first digital control circuit is connected with the second digital control circuits through an offline instruction data bus. The method has the advantages that the number of channels and the frequency coverage range can be expanded by increasing new modules, and repeated input of hardware cost is avoided.

Triple band remotely configurable tuning probes for slide screw impedance tuners allow instantaneous larger frequency coverage beyond the capacity of existing tuning probes using the single horizontal and vertical axis mechanism of a prior art single probe, single band tuner. This is done by combining two types of tuning slug, a core slug and a saddle slug into a configurable tuning probe assembly mounted in the same mobile tuner carriage and controlled using the same single vertical axis mechanism with the help of two ridges on the core slug and a permanently mounted slug control fork. To avoid spurious resonance phenomena the tuning slugs are controlled, driven, and locked vertically sliding on each other, and guided appropriately allowing smooth, uninhibited vertical movement of the metallic bodies.

An extensible multi-channel array receiver comprises a receiver body and is characterized in that the receiver body is of a layered structure and is sequentially provided with a basic module and N extension modules from bottom to top, and the N extension modules comprise at least one channel extension module and at least one frequency extension module. The base module and the extension modules are of a rectangular structure, mounting seats are arranged at the four vertex angles of the base module and the extension modules, mounting holes are formed in the mounting seats, the base module and all the extension modules are sequentially spliced together in an overlapped mode, the same mounting column penetrates through the mounting holes in the four corners and is fixed, and the layered structure is formed. The method has the advantages that the number of channels and the frequency coverage range can be expanded by adding new modules, and repeated input of hardware cost is avoided.

The utility model discloses a ridge waveguide port double-channel combiner, which comprises an upper cavity, a lower cavity is arranged at the rear end of the upper cavity, a ridge waveguide port A is arranged at the front end of the lower cavity, a plurality of fixing screws are arranged at the front end of the lower cavity, a WR standard waveguide port is arranged at the front end of the upper cavity, and the WR standard waveguide port is arranged at the front end of the lower cavity. The front end of the upper cavity is provided with an adjusting screw, the outer side of the adjusting screw is sleeved with a rubber pad, a magic T design mode is adopted in a transmitting path and a receiving path, a double-path and double-path combination function is achieved, the frequency covers the WR187 / BJ48 full frequency band, a silicon carbide customized load is adopted, the power bearing capacity of the product is larger than 200 W, and the low-loss and low-standing-wave-ratio performance is achieved. According to the utility model, two paths of loss balance is less than 0.1 dB, the structure and the function of adjusting loss balance are realized, an antenna port adopts a standard WR187 / BJ40 standard waveguide port, a transceiving port adopts a non-standard ridge waveguide port, the structure is compact, and the low intermodulation performance is good.

The invention relates to the technical field of building decoration construction, and discloses a decorative sound-absorbing wall which comprises a sound-absorbing wall body, the sound-absorbing wall body comprises a wall body unit, an adjusting unit is arranged on the surface of the wall body unit, and a secondary sound-absorbing unit is arranged on the inner wall of the wall body unit. According to the decorative sound-absorbing wall surface, the adjustable air cavity is driven by the lead screw to be linked with the base layer plate, a Helmholtz resonance system is constructed, the thickness of the air cavity is adjusted within the range of 10-80 mm, the frequency coverage is 100-400 Hz, the lead screw is clamped and fixed by the spring, and the sound absorption efficiency is improved at the low-frequency band of 100-500 Hz; a sliding rail-lead screw structure enables the base layer plate to slide, adapts to new and old wall surfaces, is manually adjusted to adapt to scenes such as office areas and music halls, and is suitable for scene expansion; according to the spring clamping type secondary sound absorption unit, 500-5000Hz sound waves are processed through glass wool, 100-5000Hz full-band coverage is formed through low-frequency resonance, rapid glass wool replacement is supported, the maintenance cost is reduced, the medium-high frequency absorption efficiency is improved, and noise reduction and convenient maintenance are combined.

The invention relates to the field of pallets, and discloses a shock absorption pallet which comprises a bearing frame and a shock absorption assembly, and the shock absorption assembly comprises shock absorbers and shock absorption connecting pieces. The bearing frame is connected with the mounting base through the damping assembly, one end of the damper is connected with the bearing frame, and the other end of the damper is connected with the mounting base through the damping connecting piece so as to absorb vibration transmitted to the bearing frame and target equipment by the mounting base, improve the shock resistance of the pallet and provide effective protection for the target equipment. And the target equipment is prevented from being damaged to the greatest extent. Compared with shock absorption structures such as rubber pads and spring shock absorption structures in the prior art, the shock absorption assembly adopts the shock absorbers as the shock absorption structures, the shock absorption frequency coverage is wider, the shock absorption assembly can cope with various types of vibration, the shock absorption effect of the shock absorption assembly is enhanced, the adaptability of the shock absorption assembly to various different working conditions is improved, and the service life of the shock absorption assembly is prolonged. And resonance can be restrained, damping failure is avoided, vibration is actively isolated, the vibration isolation effect is good, and the damping efficiency is improved.

The present application relates to the technical field of terahertz spectrum detection, in particular to a kind of directly encoded waveform's atomic terahertz spectrum detection method and device, the detection method uses " direct modulation coding + algorithm reconstruction", the bandwidth of the terahertz frequency domain spectrum obtained overcomes the narrow bandwidth defect of atomic detection, the frequency coverage range of its spectrum is determined by the bandwidth of terahertz modulator, is not limited by the intrinsic narrow bandwidth of atomic detector, realizes the terahertz spectrum fast and efficient detection of more than GHZ bandwidth, can be applied to gas component detection, substance concentration analysis, nondestructive testing and other fields, has good application value.

Tri-state triple band remotely configurable tuning probes for slide screw impedance tuners allow instantaneous larger frequency coverage beyond the capacity of existing tuning probes using the single horizontal and vertical axis mechanism of a prior art single probe, single band tuner. This is done by combining two tuning slugs, a master slug and a slave slug into a configurable tuning probe assembly mounted in the same mobile tuner carriage and controlled using a single vertical axis mechanism. To avoid spurious resonance phenomena the tuning slugs are controlled, driven, and locked vertically sliding on each other, and guided appropriately allowing smooth, uninhibited vertical movement of the metallic bodies.

The invention discloses a CAN card interference suppression method and system based on deep learning, and relates to the technical field of model interference suppression. Comprising the following steps: collecting historical data and real-time data in a working scene, and preprocessing the historical data to obtain a basic data set; constructing a quantitative evaluation system, carrying out interference evaluation, and selecting an interference type according to an interference evaluation result; according to the technical key points, based on a constructed quantitative evaluation system, the quantitative evaluation system comprises a frequency coverage index, an amplitude intensity index, an error correlation index, a scene proportion index and a trend development index, and in combination with trend development quantitative evaluation of interference characteristics, the data ratio of a constructed training data set is more practical, and the training efficiency is improved. According to the method, the model is prevented from over-fitting the trend characteristics, the trend development degree index provides directional guidance for data construction and parameter optimization, the future interference recognition effect is better, the use effect is better, and the method has good use prospects.

The invention discloses a Lamb wave resonator and a preparation method thereof, and belongs to the technical field of radio frequency MEMS devices. According to the Lamb wave resonator, before the piezoelectric film layer and the substrate layer are bonded, part of the area of the first side face (namely the back face), close to the substrate layer, of the piezoelectric film layer is thinned, so that a single Lamb wave resonator has multiple working frequencies, and then multi-frequency coverage is achieved under the condition that the size is small. After the operation, the second side surface (namely the surface), far away from the substrate layer, of the piezoelectric film layer is flat, no height difference exists, and the preparation of an interdigital electrode (IDT) can be realized by adopting a conventional photoetching interdigital electrode (IDT) process. Therefore, the preparation of the Lamb wave resonator with multi-frequency coverage can be easily realized.

The application provides a transformer zero line live fault point judgment detector, and relates to the field of power fault diagnosis equipment. The transformer zero line live fault point judgment detector comprises a perception layer, an analysis layer and an interaction layer three-layer design architecture, the perception layer captures signals through a wide frequency electromagnetic induction array, the perception layer is composed of an electromagnetic induction array hardware and a frequency coverage module, and high-sensitive electromagnetic capture is realized by cooperating with a spatial arrangement technology; the hardware of the electromagnetic induction array is 8 groups of nanocrystalline alloy induction coils which are distributed in a ring shape, and each group of coils is connected in series with a 0.1 mu F high-frequency capacitor. The application realizes accurate anti-interference through topology identification and feature matching, the positioning speed is improved by 300 times, the detection efficiency is greatly improved, the power loss is reduced, the economic benefit is significantly improved, and the risk of manually contacting the live line is completely eliminated.

The utility model discloses a flat coil hot press molding integrated inductor which comprises a flat coil, the flat coil comprises a base magnet and a winding body, a bending part is arranged at the bottom of the winding body, the winding body is arranged on the inner side of the bending part, and an inductor wrapping insulator is arranged on the outer side of the flat coil. The inductor is an integrated inductor which is formed by bending a flat coil, implanting the flat coil into an I CORE hot press forming structure, heating the flat coil through a mold and pressing the flat coil. The integrated inductor formed by hot press molding of the flat coil has the advantages of low loss alloy powder die casting, low impedance, no lead end, small parasitic capacitance, unique integrated structure, firmness, accurate product thickness, lasting rust prevention, small volume, large current, low cost and the like. Excellent temperature rise current and saturation current characteristics are still kept in high-frequency and high-temperature environments, and the working frequency coverage range is wide.

The invention discloses a transformer and medical imaging equipment, and relates to the technical field of transformers, a circuit board is provided with a radio frequency input connection structure, a radio frequency output connection structure and a reference ground; the transmission line modules and the capacitor module are connected in series, the first end of the transmission line module at the head end is connected with the radio frequency input connection structure, the second end of the transmission line module at the tail end is connected with the radio frequency output connection structure, and the capacitor module is connected to a series connection node of the transmission line modules and is connected with a reference ground. Therefore, a section of long transmission line can be split into a plurality of sections of short transmission line modules connected in series on the basis of not changing the total length of the transmission line, so that the problems of impedance mismatch and the like of a single section of long transmission line under high frequency can be avoided, the upper limit frequency can be improved on the basis of not influencing other performances, and the frequency coverage ratio is widened; moreover, the capacitor module is used for solidifying the parasitic effect, thereby facilitating the improvement of the product consistency.

The utility model relates to the field of types, and discloses a millimeter wave ultra-wideband frequency hopping frequency synthesizer module. According to the invention, the comb spectrum frequency multiplication technology, the dot matrix frequency selection technology and the frequency shift phase locking technology are adopted for frequency synthesis, so that the product has the excellent characteristics of extremely low phase noise, ultra-wide frequency coverage, high frequency hopping speed, ultra-low spurious and the like. The comb spectrum frequency multiplication and ultra-low phase noise dot matrix synthesis technology is adopted, and other phase noise deterioration is not introduced, so that the dot frequency array participating in auxiliary phase locking has extremely low phase noise. The dot frequency array does not introduce extra phase noise deterioration while realizing frequency shift and frequency reduction of the ultra-wideband frequency signal. Each dot frequency is selected through a switch, and phase-locked frequency synthesis in an ultra-large bandwidth range is realized through a frequency mixing and shifting mode. Through dot frequency array auxiliary frequency shift and phase locking, ultra-wideband frequency signals are converted to low intermediate frequency for phase locking, the frequency multiplication coefficient is greatly reduced, and very excellent phase noise can be obtained through frequency synthesis.

The invention discloses a broadband signal source system and a control method, and belongs to the technical field of radio frequency testing. The system comprises a reference source and a microwave module, the microwave module is provided with a control panel, and the control panel comprises a communication interface, a DCDC power supply and an FPGA; the reference source adopts a double-ring circuit structure, a low-noise integer ring generates a three-reference-point reference signal of an L wave band, the three-reference-point reference signal serves as a reference signal of a fractional phase-locked loop, and the reference signal is processed through switch filtering, power control and a pulse modulation circuit to form a low-noise signal with the frequency covering 0.1 GHz-20 GHz, KHz frequency resolution and 0.5 dB power precision. The control method comprises the steps that the upper computer sends a control instruction, the communication module receives and transmits the control instruction to the control panel, the control panel controls the reference source to generate a reference signal, the reference signal is processed to form a low-noise signal, and the control panel returns the state to the upper computer. According to the invention, the compatibility and expansibility are improved through modular design, the test cost and demand are balanced, and the demand of radio frequency component test for high-quality signals is met.

The invention provides a piezoelectric vibrator type test device and a fatigue test method, and relates to the technical field of aero-engine tests. The piezoelectric vibrator type test device comprises a test base, a piezoelectric vibrator and a connecting rod. The test base and the piezoelectric vibrator are connected through the connecting rod, and the connecting rod is in threaded connection with the test base, so that the distance between the piezoelectric vibrator and the test base can be changed by screwing the connecting rod, and the inherent frequency of the device can be adjusted. In this way, the vibration frequency requirements of different tested pieces are met by changing the inherent frequency of the device under the condition that the inherent frequency of the piezoelectric vibrator is not changed, the accuracy and reliability of the test result are guaranteed, frequency adjustment is achieved in a threaded connection mode, continuous change and adjustment quantification of frequency adjustment are achieved, and the test efficiency is improved. And the frequency coverage is wider, so that the frequency adjustment can be more accurately and conveniently realized according to the frequency requirement of the tested piece.

The invention discloses a multi-field and multi-scene-oriented arbitrary multi-frequency pseudo-random signal electrical stimulation device, which is characterized in that the device provides a signal generation module, a signal receiving module, a signal amplification module, a signal output module, a power supply module and the like which are connected in sequence. The multi-frequency pseudo-random signal used by the device integrates the advantages of low-order and high-order pseudo-random signals, is wide in frequency coverage, can flexibly customize and switch the low-order and high-order pseudo-random signals, is realized through specific coding, is high in practical operability, can accurately match the inherent frequency range of a target area in different application scenes, and is high in practicability. And multi-frequency combined signals are selected as required to realize synchronous stimulation. No matter in the fields of rehabilitation physiotherapy, tissue function adjustment, special biological effect regulation and control and the like, the device can adapt to differences of different groups and individuals, the personalized stimulation requirements of diversified scenes are met, and the adaptation range is far beyond that of a traditional single-field device.

The invention discloses a quantum computing-oriented low-temperature broadband CMOS (Complementary Metal Oxide Semiconductor) voltage-controlled oscillator, which belongs to the technical field of CMOS integrated circuits and comprises a Class-C dual-core push-pull cross coupling amplification circuit, a dual-mode resonant inductance network, a symmetric inductance mode switching circuit and a digital control capacitor array. The Class-C dual-core push-pull cross-coupling amplification circuit realizes current multiplexing through alternate conduction of upper and lower symmetrical transistors, reduces power consumption and inhibits phase noise. The dual-mode resonant inductor network and the symmetric inductor mode switching circuit cooperatively switch a low-frequency / high-frequency mode, so that the frequency coverage range is expanded; the digital control capacitor array adjusts equivalent capacitance and compensates frequency deviation caused by inductance change at low temperature. The oscillator is suitable for scenes of quantum calculation control, low-temperature radio frequency communication, high-precision frequency synthesis and the like.