80 results about "Cavity resonance" patented technology

The technology described herein is directed towards a metasurface arranged with unit cells for narrowband sound absorption, in which the unit cells are based on Helmholtz resonators that can have their resonant frequencies adjusted via MEMS actuators. A sound absorbing unit-cell is designed and constructed based on a general resonance frequency, and includes a neck portion and air chamber dimensioned to resonate close to the desired resonance frequency and thereby inverse phase cancel corresponding narrowband frequencies of incoming sound waves. A moveable partition in the resonators, controlled by MEMS actuators, facilitates changing of the resonators' air cavity dimensions, to adjust the resonant frequencies to cancel acoustic waves of different frequencies corresponding to noise, which can change over time. The unit cells can be distributed as part of a metasurface, which can be positioned proximate to a noise source to phase cancel the noise.

The invention relates to an air tightness detection device and method based on resonance frequency shift of a resonant cavity, belongs to the technical field of air tightness detection, and aims to solve the problems of high equipment cost, complex operation, low efficiency and difficulty in realizing multi-parameter quantitative detection in the traditional air tightness detection technology. High-purity helium with rated pressure is filled into a to-be-detected piece through a gas compressor, the to-be-detected piece is placed in a volume-adjustable detection container after pressure maintaining, and leaked helium is pumped by a vacuum pump to flow into a resonant cavity; resonance frequency deviation caused by helium concentration changes is monitored, temperature and humidity calibration data are combined, three air tightness parameters including the leakage rate (Pa.m / s), the leakage speed (mL / min) and the leakage pressure (Pa) are calculated in real time through a microcontroller, and the air tightness grade of a to-be-detected piece is output according to the air tightness detection standard. According to the device, the volume of the detection container is adaptively adjusted through the sliding rail, and the detection efficiency and adaptability can be remarkably improved by combining frequency mixing excitation and a rapid frequency calibration technology; according to the method, resonance frequency shift-helium concentration-airtightness parameters are converted, and high-precision, multi-parameter and integrated airtightness detection is realized. The invention has the advantages of fast response speed, strong anti-interference performance, low cost and the like, is suitable for fast automatic leak detection of industrial products such as sealing devices, pressure containers and the like, and provides a new scheme for trace gas detection and gas tightness grading.

The invention discloses a bridge type structure micro-bolometer based on a Mn-Co-Ni-O thin film and a preparation method of the bridge type structure micro-bolometer. According to the method, a Mn-Co-Ni-O post-high-temperature annealing process is considered, annealing is carried out on the suspension structure where the sacrificial layer is released, an organic sacrificial layer material release process is compatible, and the problem that cracks are generated in Mn-Co-Ni-O manufacturing due to tension and compression stress of materials of all layers of a substrate at a high temperature is minimized through annealing of the suspension structure; a bridge type structure based on Mn-Co-Ni-O is provided, and the limitation that traditional Mn-Co-Ni-O can only adopt an organic sacrificial layer and back digging to carry out thermal isolation design is eliminated; the F-P resonant cavity resonance absorption structure based on Mn-Co-Ni-O is successfully manufactured, traditional self-absorption based on a Mn-Co-Ni-O thick film is replaced, and the heat capacity of a device is reduced while absorption is enhanced by adopting a thin film optical structure; the applicable scene of the invention can be expanded to all cantilever or film-suspending micro-nano devices, such as inertial sensors, pressure sensors, chemical / biological sensors and optical detectors of other principles.

The invention relates to a method for rapidly measuring the resonant frequency of a resonant cavity based on frequency spectrum polynomial fitting, and belongs to the technical field of acoustic / optical measurement. The objective of the invention is to solve the problems of tedious steps, low efficiency, long time, poor stability and the like of a resonant cavity or resonant photoacoustic cavity resonant frequency measurement method. According to the method, the frequency spectrum of the resonant cavity is obtained through frequency mixing excitation, the frequency is obtained after curve fitting is conducted on frequency spectrum data points through a frequency spectrum polynomial fitting algorithm, and then resonant frequency measurement of the resonant cavity is achieved. According to the method, the measurement time of the resonant frequency of the resonant cavity is remarkably shortened, the measurement steps are simplified, and the measurement precision is improved; meanwhile, the resonance frequency is solved through frequency spectrum polynomial fitting, data noise interference can be effectively reduced, and the method has higher robustness. All frequency signals within the resonant frequency drift range are transmitted at a time through frequency mixing excitation, one-by-one scanning is not needed, and therefore the method has the advantages of being good in real-time performance, high in response speed, high in precision and the like, and is suitable for rapid frequency calibration and real-time monitoring in the fields of acoustic resonators, resonant photoacoustic spectra and the like. And a novel method for measuring the resonant frequency is provided for the fields of high-sensitivity resonance photoacoustic spectroscopy, acoustic trace gas detection and the like.

The invention relates to an acoustic insulation panel (1) based on Helmholtz single-cavity resonators, designed to effectively attenuate low-frequency noise generated by industrial equipment. The panel (1) is formed by a front wall (2) and a rear wall (3), both U-shaped, enclosing a hollow space (4) that acts as a resonator cavity. The shorter sides (2', 3') of these walls are folded inwards, forming channels that function as inlets (5) to the resonator. Furthermore, an acoustic insulation system composed of several of these panels (1) is described, in which the panels are arranged so as to allow both ventilation and noise attenuation. The associated acoustic insulation method consists of facing the resonators to maximize noise absorption at specific frequencies, ensuring a laminar air flow that improves the efficiency of the system without the need for large volumes or additional silencers.

This application provides a long-wave infrared light absorber based on phase change materials and MIM structures, belonging to the field of integrated photonic devices. The absorber includes a reflective layer, a double dielectric layer, and a metasurface layer. The metasurface layer allows light waves to enter the double dielectric layer through diffraction. The reflective layer and the metasurface layer form two reflective surfaces, allowing the light waves to undergo multiple reflections and achieve FP-cavity resonance. When the metasurface layer is crystalline and the polarization state of the light wave is not parallel to that of the metasurface layer, both the reflective layer and the metasurface layer possess metallic properties, enabling plasmon resonance when the frequency of the incident light wave matches the collective oscillation frequency of free electrons in the metal. Both FP-cavity resonance and plasmon resonance lead to the localization and enhancement of the electromagnetic field within the double dielectric layer, thereby enhancing the absorption of light waves. This application achieves reversible switching between two light wave absorption states by changing the phase state of the phase change material.

The present invention provides an on-chip photonic circuit for generation of a polarization-entangled photon-pair state by utilizing the optical nonlinearities in a novel configuration comprising dual micro-resonators, with nearly degenerate transverse-electric- and transverse-magnetic-polarized cavity resonances for the two resonators coupled in series to a common bus waveguide, wherein, the pump laser and the generated signal and idle photons can be coupled in and out the photonic circuit.

The invention discloses a high-power micro-cavity optical frequency comb generation device and method, and solves the problems that an existing optical frequency comb system needs to adopt a high-speed tunable laser to carry out precise scanning locking on micro-cavity resonance, or depends on distributed feedback type semiconductor laser with extremely narrow linewidth to carry out optical injection feedback on an ultra-high-quality micro-cavity; in order to solve the problems of complex system structure and operation due to the fact that the existing optical frequency comb has the advantages of high repetition frequency, high comb power and wide spectral range, pumping is carried out by a pumping unit, optical frequency comb generation and synchronous power amplification are carried out through an active gain microcavity, and the channel interval (100GHz) of the optical frequency comb meets the international communication standard. The power of a single comb tooth reaches a hundred mu W level and is improved by 2-3 orders of magnitude compared with a common Kerr microcavity optical frequency comb scheme (a typical value is a hundred nW level), so that weak signal power amplification is not needed, and the Kerr microcavity optical frequency comb has important application value in the field of optical communication.

This invention discloses a centrifugal fan structure, a motor, and an air conditioner using the same. The centrifugal fan structure, used in an air conditioner, includes a first mounting plate, a second mounting plate, fan blades, and a hub. One end of the fan blades is mounted on the first mounting plate, and the other end is mounted on the second mounting plate. The hub is located on the second mounting plate and forms a cavity between it and the bottom plate of the air conditioner housing. A silencing hole is provided on the hub, and the silencing hole communicates with the cavity. First, this invention uses the silencing hole to disrupt the nearly sealed cavity formed by the hub and the second mounting plate, reducing cavity resonance noise. Second, the silencing hole on the hub can improve the cavity mode of the enclosed space, avoiding resonance excitation in low-speed spaces, thereby solving the vibration and noise problem of the centrifugal fan structure.

The application discloses an underwater sound absorption superstructure with double-cavity resonance, which comprises a cavity, two embedded necks and a sandwich layer. The cavity is a rectangular cavity, the sandwich layer is vertically arranged in the cavity and divides the cavity into a first chamber and a second chamber which are arranged in left and right sides, and a through hole is formed in the upper surface of the first chamber and the second chamber; the two embedded necks are hollow straight pipes, respectively penetrating the through holes in the upper surfaces of the first chamber and the second chamber to enter the cavity, so that the first chamber and the second chamber are communicated with the outside. The application utilizes Helmholtz resonance sound absorption, the first chamber and the second chamber of the cavity are connected in parallel through the two embedded necks and connected in series through the holes or gaps of the sandwich layer, so that the sound absorption of the application is different from the classical Helmholtz sound absorption, and the sound absorption is characterized by the coupling of the resonance frequencies of the two single chambers, the sound absorption with a wide frequency is formed, and the wide-frequency sound absorption is realized. The deformation loss of the sandwich layer is derived from the sound absorption mechanism of the pressure difference between the two chambers, so that the superstructure is still effective at high hydrostatic pressure, and the loss effect is increased.

The application discloses a kind of hollow degree and grain fullness of pepper multi-dimensional acoustic online monitoring method and system, it is related to agricultural product quality detection technical field, method includes: by reticular conveyor belt makes the uniform speed of the pepper monomer to be measured in sound insulation shielding channel movement;Utilize air coupling ultrasonic emission probe to the pepper monomer to be measured directional emission ultrasonic wave, utilize transmission wave receiving probe to capture transmission wave after penetrating the pepper, simultaneously utilize micro sound emission sensor to capture the micro sound emission signal of the pepper;Extract the cavity resonance frequency offset of transmission wave and sound energy attenuation coefficient, carry out band energy extraction to the micro sound emission signal to calculate sound energy entropy;After multi-dimensional acoustic characteristics are standardized respectively, as multi-dimensional feature vector, input into the support vector regression model that is trained in advance, output the hollow and fullness comprehensive evaluation index of the pepper monomer to be measured.This scheme can reduce detection cost, no radiation and can accurately penetrate epidermis to obtain internal grain real state.

The present application relates to the technical field of resonant frequency control, and particularly relates to a whispering gallery mode microcavity resonant frequency regulation method and system. The present application analyzes resonant frequencies, temperature data and resonant wavelength movement amounts at different monitoring moments, and obtains coupling influence degrees at each monitoring moment; according to resonant frequency distributions in a time neighborhood range of each monitoring moment, it is judged whether the time neighborhood range needs to be extended; if so, a target function of resonant frequency change rate is constructed in combination with a corresponding preset time extension amount; according to change trends of the preset time extension amounts in the time neighborhood ranges before and after the moment, and the coupling influence degree distributions of different monitoring moments in the preset time extension amounts, a restriction condition of the target function is constructed, and the preset time extension amount is obtained; and the regulation of the microcavity resonant frequency is realized. The present application obtains a suitable heating duration in the heat reflux regulation process, and improves the accuracy of the resonant frequency regulation.

An electronic device provided by the present invention comprises a shell with an accommodating cavity and a sound production monomer arranged in the accommodating cavity, the sound production monomer has a first side and a second side which are opposite to each other along the vibration direction of a vibration system, and a front cavity is formed between the first side of a first vibrating diaphragm and the shell. A rear cavity is formed between the second side of the second vibrating diaphragm and the shell, and the front cavity and the rear cavity are isolated from each other; a Helmholtz resonance cavity structure is arranged in the front cavity, the Helmholtz resonance cavity structure comprises a Helmholtz resonance cavity body and a Helmholtz resonance cavity airflow channel communicated with the Helmholtz resonance cavity body, and sound waves of the front cavity enter the Helmholtz resonance cavity body through the Helmholtz resonance cavity airflow channel. By using the electronic equipment, the problems that the front cavity in the existing electronic equipment resonates, the sensitivity generates a formant, and the sound is easy to be sharp and harsh can be solved.

Systems and methods for performing fault-tolerant quantum operations for a four-legged cat code are provided. A quantum system includes an auxiliary qubit dispersively coupled to a first logical qubit, and the quantum system can be operated at least in part by generating and applying a first drive waveform to the auxiliary qubit, the first drive waveform including a first comb of pi pulses having selective frequencies corresponding to a first selection of even and odd cavity resonance frequencies of the first logical qubit; and reading out a state of the auxiliary qubit.

This invention discloses a noise reduction device and a wheel, including a housing and a control body disposed within the housing. The housing contains a chamber and an opening. The control body includes a rotating body and a rotating shaft. Specifically, the rotating shaft is coaxially connected to the end of the rotating body, which is disposed within the chamber. A baffle is provided on the outer wall of the rotating body. A resonant cavity is formed between the baffle, the outer wall of the rotating body, and the inner wall of the chamber. The resonant cavity communicates with the opening, and the size of the opening is the same as the size of the resonant cavity. Thus, the resonant cavity forms a quarter-wavelength tube. Therefore, this application converts the change in the axial length of the quarter-wavelength tube into a change in the arc length in space. While maintaining the same spatial volume, it can significantly change the length of the quarter-wavelength tube, which is beneficial for changing the noise reduction frequency of the noise reduction device.

An example apparatus, method, and system for determining a characteristic of a target gas in a fluid sample is provided. In some embodiments, the example apparatus includes a frequency comb illumination source configured to emit pulsed light having a plurality of frequency comb wavelengths. The apparatus also includes an optical cavity containing a fluid sample and exhibiting a plurality of cavity resonance modes. A frequency comb wavelength of the plurality of frequency comb wavelengths associated with the frequency comb illumination source is configured to align with a cavity resonance mode of the plurality of cavity resonance modes. A characteristic of the fluid sample is determined based on one or more optical characteristics of a transmitted light passing through the fluid sample within the optical cavity.

The invention discloses a cast-in-place concrete structure full-period maintenance system combined with cloud gateway data transmission, and relates to the technical field of building construction, the cast-in-place concrete structure full-period maintenance system comprises a three-field coupling modeling module, a cavity resonance recognition module, a spraying posture surveying and mapping module, an anti-harmonic energy regulation and control module and a self-adaptive spraying control module, in the nighttime temperature drop stage, a fluid, bubble and pipe wall three-field coupling model is constructed, a backflow wave path, bubble compression response and pipe wall elastic reflection characteristics are extracted through time domain decomposition, and dynamic baseline data are generated. Through coupling modeling and resonance recognition, spraying deviation monitoring and blind area prediction are achieved, a spraying posture closed-loop adjusting mechanism is constructed in combination with anti-resonance injection and self-adaptive control, the maintenance uniformity and reliability are improved, the crack risk is reduced, and the service life of the structure is prolonged.

The invention discloses an out-of-band wave-absorbing electromagnetic window based on transverse quasi-cavity resonance, and relates to the technical field of artificial electromagnetic materials. An impedance layer is arranged and forms a series resonance circuit, so that incident electromagnetic waves excite transverse quasi-cavity resonance on metal wires of inductance structure units, absorption of low-frequency-band electromagnetic waves (C wave band) is achieved, and the electromagnetic window has the advantages of being simple in structure, low in cost and high in efficiency. Then, incident and reflected electromagnetic waves excite a surface plasmon polariton (SSPP) mode on the metal grid bars, so that energy is located in gaps of the metal grid bars and the second dielectric substrate, and the second dielectric substrate realizes absorption of high-frequency electromagnetic waves (Ku wave band), namely, compatible synergistic absorption of low-frequency resonance absorption of the impedance layer and high-frequency SSPP mode absorption of the high-frequency wave-absorbing structure is realized; meanwhile, efficient transmission of a middle wave band (X wave band) is achieved through the frequency selection surface on the lowermost layer, and finally absorption and transmission integration of vertical resonance regulation and transverse electromagnetic coupling is achieved under a wide frequency band.

The application discloses a kind of vacuum cavity automatic air supply method, system, equipment and storage medium, belong to automation field.The air supply system of the application vacuum cavity includes vacuum cavity and air pipe, first solenoid valve and second solenoid valve are equipped on the air pipe, when the air pressure inside the vacuum cavity is less than first air pressure threshold, gas is controlled from the air pipe into the vacuum cavity by first solenoid valve, until the air pressure inside the vacuum cavity reaches the first air pressure threshold, air supply is carried out by the second electromagnetic threshold and the first solenoid valve simultaneously;When the air pressure inside the vacuum cavity reaches second air pressure threshold, the second solenoid valve is closed, air supply is continued by first solenoid valve, until the air pressure inside the vacuum cavity reaches standard atmospheric pressure, the first solenoid valve is closed, can guarantee working efficiency while avoiding adverse effects on the welding of workpiece, and can reduce cavity resonance, finally smooth opening warehouse.

The present application provides a method, device and equipment for checking the characteristic frequency of a gas-liquid cavity, the method comprising: predicting the shear oscillation frequency interval of the gas-liquid cavity with reference to the predicted range of the ambient flow rate outside the gas-liquid cavity; predicting the structural natural frequency interval, liquid cavity modal frequency interval, gas cavity modal frequency interval and sloshing frequency interval of the gas-liquid cavity with reference to the predicted range of the gas volume ratio in the gas-liquid cavity; predicting the piston frequency interval of the gas-liquid cavity with reference to the predicted range of the gas volume ratio in the gas-liquid cavity and the predicted range of the ambient pressure outside the gas-liquid cavity; checking whether each of the structural natural frequency interval, liquid cavity modal frequency interval, gas cavity modal frequency interval, sloshing frequency interval and piston frequency interval meets the safety margin requirement relative to the shear oscillation frequency interval. Through the present application, characteristic frequency calibration is performed on the gas-liquid cavity to avoid cavity resonance problems in ships under common operating conditions.

Systems and methods for performing fault tolerant quantum operations for the 4-legged cat code are provided. The quantum systems include an ancilla qubit dispersively coupled to a first logical qubit, and the quantum system may be operated at least in part by: generating and applying a first drive waveform to the ancilla qubit, the first drive waveform comprising a first comb of 7t-pulses having selective frequencies corresponding to a first selection of even and odd cavity resonance frequencies of the first logical qubit; and reading out a state of the ancilla qubit.

The utility model relates to the technical field of injection pumps, and discloses a low-noise injection pump set which comprises a motor, a pump head is fixedly installed on one side of the motor, and an output shaft of the motor is fixedly connected with the input end of the pump head. The protection structure is arranged outside the pump head and used for reducing noise, the multiple sound absorption plates are installed on the inner wall of the cover body, interference channels are formed through the extending parts on the two sides of the sound absorption plates, the uneven interference faces are formed on the inner wall of the cover body, sound waves generated when an impeller impacts liquid can be gradually absorbed by the interference faces, and propagation and diffusion of the sound waves are restrained; the split cover body facilitates later-stage additional installation of the protection structure, meanwhile, the acoustic board and the extension part are conveniently and independently replaced after being aged and damaged, the closed structure of the cover body prevents noise from directly leaking out, gaps of the acoustic board and the interference groove absorb energy through cavity resonance and surface reflection, and the noise reduction effect is achieved. Medium-high frequency noise is absorbed through reflection and cavity resonance.

The invention discloses an ultra-wideband standing wave bridge based on an exponential gradient micro-strip balun and an assembly method thereof, which are used as directional devices in scenes such as a vector network analyzer and the like, and aim to solve the problem that the existing standing wave bridge is narrow in working band and is difficult to meet the ultra-wideband measurement requirement. The method is characterized in that the index gradual change microstrip Balun is adopted to realize balance-to-unbalance conversion so as to expand the upper limit of the working frequency; a ferrite magnetic ring is loaded at a single-end port of the balun so as to extend the lower limit of the working frequency; a film resistance technology is applied to minimize the influence of parasitic parameters; electromagnetic shielding is realized through a metal cavity structure, and a wave-absorbing material is adhered to the inner wall of the cavity to suppress cavity resonance. The ultra-wide working bandwidth of 10 MHz to 40 GHz is finally achieved, the frequency band from short waves to millimeter waves is covered, and the measurement requirement of a modern ultra-wide-band system can be effectively met.

The invention discloses a baffle structure and process equipment of a semiconductor device. The baffle structure is located above the spraying plate. The baffle structure comprises a baffle body provided with a plurality of air uniformizing holes; and the turbulent flow column is arranged on the lower surface of the baffle body, and a rectifying groove is formed in the outer surface of the turbulent flow column in the axial direction of the turbulent flow column so that large vortex airflow flowing into the gap between the baffle structure and the spraying plate can be divided into small vortex airflow. According to the invention, the periodic change of the air flow vortex between the baffle plate and the spraying plate can be destroyed, and the generation of cavity resonance phenomenon can be avoided, so that the risk of unbalanced matching of process parameters of two cavities can be reduced, the yield of the process result of a single cavity is improved, and the uniformity of the process result of multiple cavities can be improved.

To provide a high frequency circuit capable of easily predicting and controlling a cavity resonance frequency in a shield case.SOLUTION: A high-frequency circuit is provided with a printed circuit board (10) on which a circuit composed of a plurality of electronic components is arranged, a shield case (31) which is electrically connected to the ground of the printed circuit board (10) and covers the circuit, and at least one spring contact (15) which is electrically connected to the ground in a space formed by the printed circuit board (10) and the inner wall of the shield case (31), wherein the shield case (31) includes a frame (41) which is surface-mounted on the ground and is electrically connected to the ground, and a cover (51) which has a ceiling surface facing the printed circuit board (10) and is in contact with and electrically connected to the frame (41). The spring contact 15 comes into contact with a part of the ceiling surface to electrically connect the ground and the cover 51.SELECTED DRAWING: Figure 2

Systems and methods for performing fault-tolerant quantum operations for cat code are provided. A quantum system includes an ancilla qubit dispersively coupled to a first logical qubit, and the quantum system can be operated at least in part by: generating a first drive waveform and applying the first drive waveform to the ancilla qubit, the first drive waveform including a first comb of pi pulses having selective frequencies corresponding to a first selected pair of even and odd cavity resonance frequencies of the first logical qubit; and reading out a state of the ancilla qubit.

This invention provides a method and system for liveness detection within a metal chamber, relating to the field of detection technology. The method includes: simultaneously acquiring multi-source heterogeneous sensor data streams within the chamber using a multi-band microwave radar, an infrared thermal imaging array, a broadband ultrasonic sensor, and a high-sensitivity micro-vibration sensor array deployed inside the metal chamber; and, based on the multi-source heterogeneous sensor data streams, employing an adaptive signal enhancement algorithm based on frequency domain subband decomposition to suppress reverberation noise and multipath interference caused by metal cavity resonance, outputting a coherently enhanced target signal cluster. This invention improves the accuracy of liveness detection.

The application provides a low-cavity-noise tire, relates to the field of tire noise reduction, and comprises a tire body and a plurality of cavity resonance energy absorption systems; the plurality of cavity resonance energy absorption systems are used for absorbing vibration kinetic energy generated in cavities due to tire rotation; the cavity resonance energy absorption system comprises a cavity resonance energy absorption device and a connecting piece, and the connecting piece is cemented with the cavity resonance energy absorption device and the tire body on both sides. The application eliminates cavity resonance generated in the tire by reasonably arranging cavity resonance energy absorption systems with certain sizes, converts kinetic energy generated by the cavity resonance into heat energy, radiates the heat energy away through heat radiation, finally reduces cavity resonance noise generated in the process of high-speed rotation of the tire, and further optimizes the driving experience.

The invention discloses a Fabry-Perot cavity pressure detector based on an ultra-stable laser and a detection method. The Fabry-Perot cavity pressure detector comprises the ultra-stable laser, an electro-optical modulator, a polarization beam splitter and an FP cavity sensor which are sequentially arranged in the light path propagation direction. The FP cavity sensor is configured to generate cavity length change under the external pressure of the FP cavity and reflect or transmit an optical signal containing laser frequency and cavity resonance frequency detuning amount; the optical signal is reflected by the polarization beam splitter to enter the detector; the detector converts the optical signal into an electric signal; the mixer receives the electric signal and a modulation signal of the electro-optical modulator, mixes the two paths of signals, demodulates and extracts a PDH error signal; the PDH error signal is used for resolving the detuning amount of the laser frequency and the cavity resonance frequency, and an external pressure value is obtained through calculation. According to the invention, the resolution and stability of pressure measurement can be significantly improved.

A mechanism for suppressing parasitic signals or modes in FBAR resonators and filters incorporates the effects of an electromagnetic (EM) cavity resonant physics field model. The suppression of parasitic signals is realized by modifying the characteristics of the EM cavity resonance of the FBAR resonator. This is achieved by keeping the fundamental piezoelectric resonant frequency of the resonator constant and shifting the EM cavity resonance to a lower frequency. This offset in the EM cavity resonant frequency ensures that the sub-parasitic signal resulting from the interaction between the piezoelectric resonant frequency and the EM cavity resonant frequency is offset to a lower frequency, which is advantageously located in the suppression band region outside the passband of the piezoelectric resonance. The FBAR resonator is shaped to include a "zipper" edge upper electrode that includes a series of localized ridges or peaks and valleys typically between adjacent ridges or peaks.