259 results about "Band-pass filter" patented technology

The invention discloses a non-reflection band-pass filter chip based on a novel topological structure, which is characterized by comprising a dielectric substrate, a filter circuit arranged on the dielectric substrate, an input port and an output port, a topological structure of the filter circuit is in bilateral symmetry, a main signal path of the filter circuit is of a five-order band-pass filter structure, and the filter circuit comprises a first series resonator, a third series resonator and another first series resonator which are sequentially connected between an input port and an output port in series; one ends of the two second parallel resonators are respectively connected between the first first series resonator and the third series resonator and between the third series resonator and the second first series resonator, and the other ends of the two second parallel resonators are grounded; the two ends of each first series resonator are connected with an absorption branch in parallel, each absorption branch is formed by sequentially connecting a fourth parallel resonator, a resistor and a fifth parallel resonator in series, and out-of-band energy absorption is achieved through the two branches of the same structure. An absorption circuit and a main filter circuit are organically fused, the problem of out-of-band reflection of a traditional filter is solved, and meanwhile the filter has the advantages of being compact in structure, small in size and high in integration degree.

The utility model relates to a micro-fluidic flow cytometry fluorescence detector which comprises an excitation light source optical fiber, a light beam shaping module, a focusing and fluorescence collecting module and a micro-fluidic chip which are sequentially arranged along the excitation light path direction of the excitation light source optical fiber, and a multi-channel silicon photomultiplier tube is arranged above the micro-fluidic chip. A plurality of groups of detection channels for receiving fluorescence signals of different wave bands are arranged in the multichannel silicon photomultiplier tube at intervals up and down, and a dichroscope, a band-pass filter and a lens group are sequentially arranged in each group of detection channel along a light path and are gathered on a receiving chip; the micro-fluidic flow cytometry fluorescence detector can efficiently and accurately complete multi-wavelength fluorescence excitation and signal collection, and is suitable for multi-channel and multi-wavelength fluorescence detection requirements in a micro-fluidic chip.

The invention relates to the cross technical field of elevator fault diagnosis and signal processing, in particular to an elevator shaft breakage early fault detection signal denoising method. The method comprises the following steps: acquiring an original low and medium frequency discrete signal of elevator shaft body vibration, and filtering by adopting a four-order Butterworth band-pass filter to obtain a filtered signal; performing complementary set empirical mode decomposition on the filtering signal to obtain a plurality of IMF components and a residual component, and screening effective IMF components from all the IMF components; the center frequency of each effective IMF component is calculated, and Gaussian weight distribution is carried out on each effective IMF component based on the center frequency of each effective IMF component; performing signal reconstruction on all the effective IMF components and the residual components according to the weight of each effective IMF component to obtain a reconstructed signal; and smoothing residual noise in the reconstructed signal by adopting self-adaptive moving smoothing filtering to obtain a de-noised signal. According to the method, the 30-60Hz low and medium frequency characteristic signals generated in the elevator spindle microcrack propagation stage can be accurately extracted, so that fault judgment is facilitated.

The embodiment of the specification provides a copper foil defect detection system, comprising: a data acquisition module configured to acquire a copper foil surface image through a multi-spectral line-scan digital camera and output original image data; the preprocessing module is configured to perform dynamic denoising and partition contrast enhancement on the original image data to generate a preprocessed image; the frequency domain processing module is configured to perform Fourier transform on the preprocessed image to obtain a frequency domain feature map, separate a low-frequency contour and a high-frequency texture component through a band-pass filter bank, and generate a composite feature map through inverse transformation after frequency domain mask enhancement; the data enhancement module is configured to implement geometric transformation enhancement and frequency domain noise injection on the composite feature map and output an enhanced sample set; and the multi-scale detection network is configured to extract hierarchical features from the enhanced sample set, fuse the hierarchical features through a gating mechanism and output defect positioning and classification results. According to the scheme, the frequency domain image processing technology is combined with the CNN, and the detection effect of the weak contrast defect is improved.

The invention relates to a continuous writing track generation method, system and device based on a brain-computer interface and a medium. The method comprises the following steps: acquiring an electroencephalogram signal and a real writing track when a user imaginates writing through electroencephalogram acquisition equipment; extracting neural activity data related to hand writing movement by using a band-pass filter; extracting writing intention spatio-temporal features based on a preset spatio-temporal deep learning network; mapping an initial handwriting coordinate sequence and a pen state signal through a generator network comprising a full connection layer, a convolution time sequence generation layer and a pen state classification layer; calculating the similarity between the trajectory and a real trajectory by means of a discriminator, and generating handwriting and state signals through adversarial training optimization; and dividing stroke segments according to the pen state and sequentially connecting the stroke segments to generate a continuous writing track. By adopting the method, the brain motion intention can be efficiently and accurately decoded into a coherent writing track, and the practicability of a brain-computer interface in writing and interaction application is improved.

The invention provides an optical feedback resonance enhanced forward Brillouin demodulation structure, which comprises a tunable laser, a first polarization controller, an erbium-doped optical fiber amplifier, an optical coupler, an optical isolator, a forward Brillouin gain optical fiber, a band-pass filter and a photoelectric detector, a second polarization controller; and a spectrum analyzer. The first polarization controller is connected with a port a of the optical coupler, a port b of the optical coupler is connected with an input end of the erbium-doped optical fiber amplifier, an output end of the erbium-doped optical fiber amplifier is connected with the optical isolator, the optical isolator is connected with the band-pass filter, the band-pass filter is connected with the forward Brillouin gain optical fiber, and the optical fiber is fed back to a port c of the coupler through the second polarization controller. The output power of the erbium-doped optical fiber amplifier is controlled, and the polarization states of the pump light and the feedback laser are controlled by the first polarization controller and the second polarization controller, so that the forward Brillouin effect is amplified.

The utility model discloses a Ka wave band frequency source based on a phase-locked loop structure, which comprises a master controller, a crystal oscillator module, a phase-locked loop module and a frequency doubling processing module, and the phase-locked loop module is respectively connected with the master controller, the crystal oscillator module and the frequency doubling processing module. The phase-locked loop module comprises a power supply module, a phase-locked loop main chip, a loop filter module and a locking state indication module, and the phase-locked loop main chip is respectively connected with the power supply module, the loop filter module, the locking state indication module and the main controller; the frequency doubling processing module comprises a low-pass filter, a high-pass filter, a fixed frequency attenuator, a power amplifier, a frequency doubling chip and a band-pass filter which are connected in sequence, and the input end of the low-pass filter is connected with the output end of the voltage-controlled oscillator. The frequency output by the phase-locked loop module is input to the frequency multiplication processing module, and the frequency multiplication processing module carries out harmonic suppression, attenuation, amplification and frequency multiplication processing on the input frequency, so that the output frequency has the advantages of low phase noise, wide frequency band and high stability.

The application discloses a harmonic compensation and stability improvement method, system, medium and equipment, filters components of a grid voltage in a two-phase static coordinate system to obtain corresponding fundamental components; subtracts the fundamental components of the grid voltage from the components of the grid voltage in the two-phase static coordinate system to obtain total harmonic components of the grid voltage; filters the total harmonic components of the grid voltage by using multiple band-pass filters to obtain multiple harmonic components corresponding to frequencies; subtracts reference current instructions of an active power filter from the multiple harmonic components, and inputs the result as a new current reference instruction into a current controller; and based on a virtual harmonic admittance method, outputs harmonic compensation currents through current inner loop control in the two-phase static coordinate system to realize harmonic compensation on a nonlinear load with frequency coupling characteristics and suppression of harmonic compensation oscillation. The application can adapt to various complex grid environments and has relatively practical engineering application value.

The invention discloses a band-pass filter based on an artificial surface plasmon polariton structure and a design method thereof, a metal structure of the band-pass filter comprises an polariton structure region, the polariton structure region is provided with a plurality of plasmon polariton grooves, and the plurality of plasmon polariton grooves are arranged at intervals along a first direction; the depth direction of the plasmon polariton grooves is perpendicular to the first direction, the lengths and the widths of the plasmon polariton grooves are the same, and the multiple plasmon polariton grooves are formed in the same side of the polariton structure; the split resonant rings are arranged on the dielectric substrate, and the multiple split resonant rings are arranged close to the metal structure. Due to the fact that the multiple plasmon polariton grooves formed in the polariton structure and arranged at intervals in the first direction can form the artificial surface plasmon polariton structure, the band-pass filter based on the artificial surface plasmon polariton structure has the high inhibition capacity for harmonic waves of the band-pass frequency, and the band-pass filter based on the artificial surface plasmon polariton structure has the good inhibition capacity for the harmonic waves of the band-pass frequency.

The application provides a device for adopting multi-channel transmitting signals, and belongs to the technical field of signal processing. The device comprises multiple signal transmitting branches, each of which comprises a directional antenna and a radio frequency channel connected with the directional antenna; a baseband module connected with the multiple signal transmitting branches; the radio frequency channel comprises a first band-pass filter, a second band-pass filter, a first radio frequency switch and a gain adjusting module; the first radio frequency switch is used for selecting the first band-pass filter or the second band-pass filter to be communicated with the gain adjusting module according to the working mode of the device for adopting multi-channel transmitting signals, so as to output the filtered target bandwidth signal through the directional antenna, output the filtered target bandwidth signal through the directional antenna in each signal transmitting branch, and further provide a test scene for a to-be-tested wearable device, so that the performance verification of the to-be-tested wearable device does not need to be carried out in an actual scene, the verification cost is reduced, and the verification efficiency is improved.

The LTCC band-pass filter comprises an LTCC porcelain body, a first inductor and a second inductor of the LTCC band-pass filter are arranged on the upper portion and the lower portion in the left side of the LTCC porcelain body respectively, the two inductors in the right side and the two inductors on the left side are symmetrically arranged, and other capacitors are correspondingly arranged. According to the utility model, the four inductors are arranged up and down and in bilateral symmetry, and the distance between the inductors at the input end and the output end can be flexibly adjusted, so that the coupling coefficient is adjusted, another two zero points are obtained by adjusting the coupling coefficient of the two inductors, the near-end suppression of the filter is optimized, and the selectivity of the filter is improved.

The present application relates to a kind of passage attention residual network emotional electroencephalogram identification method, belong to brain information decoding technical field.The present application uses Butterworth band-pass filter to obtain the target frequency band of original electroencephalogram, combines differential entropy algorithm, respectively to target frequency band obtains feature and it is converted into 4D representation according to electrode channel position.Extracted multi-band differential entropy feature is used as the input of model, using passage attention residual network to learn feature, channel attention mechanism can be well simulated electrode channel information and enhance convolution feature learning, and can significantly improve emotional classification accuracy.The present application can be used as a kind of combination of time, frequency and spatial information emotional electroencephalogram decoding strategy, the proposed passage attention residual network model provides new ideas for building better emotional recognition framework in the future.

An RF device may include an RF antenna, and an ASIC downstream from the RF antenna. The ASIC may include ADCs configured to generate replica digitized input signals, a DSP core downstream from the ADCs and having first complex coefficient multipliers, first band pass filters respectively coupled to the first complex coefficient multipliers, and a summer downstream from the first band pass filters. The ASIC may also include DACs configured to generate analog output signals, and a feedback loop coupled between the DACs and the ADCs. The RF device may further include a processor configured to control the first complex coefficient multipliers and associated delay circuits.

The invention discloses a band-pass filter structure packaging method based on an RDL technology, and relates to the technical field of electronic engineering and semiconductor packaging. An RDL layer is constructed on the surface of a chip of a band-pass filter structure, a chip connecting device in a band-pass filter is connected with the chip, a local shielding layer is laid on the surface of the chip of the band-pass filter, a chip module and a band-pass filter function module are subjected to glue pouring packaging and connection, and a complete band-pass filter function module is constructed; and the band-pass filter function module is placed in the lower shell, the upper shell is buckled, secondary glue pouring packaging is carried out, and packaging of the band-pass filter structure is completed. The packaging efficiency and the yield of the band-pass filter are improved by adopting a staged glue filling and modular manufacturing mode. An asymmetric resonance unit layout is provided, an electromagnetic band gap (EBG) structure is formed in combination with a grounding through hole array, the high-frequency (more than 60 GHz) out-of-band rejection ratio is enhanced, and the use effect of the band-pass filter is improved.

The invention discloses a system and a method for identifying electric equipment by using a null line electromagnetic waveform, and belongs to the technical field of non-intrusive load monitoring. The system comprises a high-frequency current sensor which is installed on a main zero line of a distribution box and is used for collecting an instantaneous current signal in a non-contact manner; the signal conditioning module comprises a 3kHz-150kHz band-pass filter and an amplifying circuit; the sampling rate of the analog-to-digital converter is not lower than 500kS / s, and the quantization bit is greater than or equal to 12 bits; the embedded processing unit is internally provided with a one-dimensional convolutional neural network model combined with a channel attention mechanism, and the model comprises at least three one-dimensional convolutional layers, two pooling layers, an attention layer and a full-connection output layer; and the storage module is used for storing equipment identity, waveform characteristics and type information. According to the method, live wire interference is effectively avoided by analyzing the high-frequency electromagnetic waveform of the null line, high-precision and high-robustness equipment identification can still be realized in complex scenes such as multi-equipment concurrency and power grid disturbance, and the method is suitable for smart home and energy management systems.

The present disclosure provides an ultrasonic radar speed measurement method, a speed measurement circuit and an electronic device, and relates to the field of ultrasonic speed measurement. The ultrasonic radar speed measurement method comprises: low-noise amplifying an ultrasonic echo signal reflected by a target object; performing analog-to-digital conversion processing on the amplified ultrasonic echo signal to obtain a digital echo signal; inputting the digital echo signal into a frequency shift extraction unit; filtering the digital echo signal by a band-pass filter in the frequency shift extraction unit; the frequency shift extraction unit comprises a plurality of parallel band-pass filters, and the center frequency of each band-pass filter corresponds to a Doppler frequency shift; determining the target Doppler frequency shift corresponding to the digital echo signal based on the output signal amplitude of the band-pass filter; and determining the speed of the target object based on the target Doppler frequency shift. Thus, the speed of the target object can be quickly and accurately determined.

A heat medium improvement device 2 reduces power consumption of a temperature controller by improving fluidity of a heat medium. The heat medium improvement device 2 has: a switching type converter 22; a band-pass filter 23 to which the voltage outputted from the converter 22 is inputted and which outputs a voltage having a frequency component corresponding to spike noise; and a conductive wire 25 that applies the output voltage of the band-pass filter 23 to a pipe 31 through which the heat medium flows, the conductive wire being connected to the band-pass filter 23.

The invention discloses a centrifugal switch vibration signal acquisition and analysis method, and relates to the technical field of centrifugal switch testing, and the method comprises the steps: designing a vibration signal acquisition circuit frame which comprises a vibration sensor, a signal conditioning circuit, a band-pass filter, a high-speed data acquisition circuit and data processing software; establishing a signal conditioning circuit, wherein the signal conditioning circuit comprises a constant current source module, a signal blocking module, a buffering and amplifying module, a direct current bias level adjusting module and a low-pass filtering module; building a band-pass filter, and using an active second-order low-pass filter and an active second-order high-pass filter to improve the bandwidth of the band-pass filter; a high-speed data acquisition circuit is established, and a high-precision AD sampling chip is adopted to acquire data; analyzing the collected data through data processing software by using a wavelet transformation algorithm and a sliding window standard deviation algorithm to obtain a vibration signal starting moment; when the vibration signals are collected, the precision is high, and the vibration time is accurately judged.

The present application provides a continuous scanning laser Doppler vibration test method for the outer surface of a thin-walled casing. Firstly, the continuous scanning vibration test is performed on the outer surface of the thin-walled casing, and the vibration time-domain signals of the outer surface of the thin-walled casing are collected. Then, the vibration displacement amplitude of the outer surface of the thin-walled casing is obtained by processing the tested time-domain signals through a band-pass filter and a Hilbert transform. Next, the laser continuous scanning path point coordinate model of the variable cross-section outer surface of the thin-walled casing is established, and the laser continuous scanning path point coordinates of the outer surface of the thin-walled casing at the missing hole are deleted by comparing with the coordinate model of the UG of the thin-walled casing. The vibration displacement amplitude based on the laser continuous scanning path point coordinates is obtained. The continuous scanning modal shape of the planar expansion of the outer surface of the thin-walled casing is obtained. Finally, the three-dimensional continuous scanning modal shape of the outer surface of the thin-walled casing is obtained through a coordinate conversion formula. Compared with the traditional test method for the outer surface of a thin-walled cylinder, the test efficiency is greatly improved, and the range of the test structure is expanded.

The invention discloses a communication method and device, a terminal, network side equipment and a medium, and belongs to the technical field of communication, and the communication method comprises the steps that the terminal sends or receives signals through M radio frequency links, each radio frequency link comprises at least one power amplifier, the duplexer or the band-pass filter is connected with the at least one power amplifier, the different radio frequency links are used for sending or receiving signals in different frequency ranges in the same frequency band, and M is an integer larger than 1; and the terminal sends a first signaling to the network side equipment, wherein the first signaling comprises information of a frequency range covered by a radio frequency link of the terminal and working mode information of the terminal on the radio frequency link.

The utility model relates to a broadband anti-burning anti-crosstalk annular low noise amplifier assembly, which comprises an input end, a low noise amplifier assembly and an output end, the input end is connected with a band-pass filter, and the output end is connected with a low-pass filter; the band-pass filter is connected with the low-noise amplifier assembly, and the low-pass filter is connected with the low-noise amplifier assembly through the down-conversion mixer; the low-noise amplifier assembly is of a multi-stage cascade system structure and comprises a front-stage broadband low-noise amplifier, a rear-stage SPDT radio frequency switch, a biasing circuit with temperature and voltage compensation effects and an ESD protection circuit. The front-stage broadband low-noise amplifier is cascaded with the rear-stage SPDT radio frequency switch; the front-stage broadband low-noise amplifier and the rear-stage SPDT radio frequency switch are respectively cascaded with a biasing circuit with temperature and voltage compensation effects; the utility model has the advantages of reasonable structure, strong anti-interference performance, safety and reliability, and can avoid burnout.

The application discloses a kind of wideband sandwich radome based on double-band super surface, it includes sequentially arranged first impedance matching layer, radome frequency selective surface layer, second impedance matching layer, the radome frequency selective surface layer includes several periodic frequency selective surface units, radome frequency selective surface layer is formed by multilayer metal structure and dielectric substrate A space filter, so that corresponding wideband sandwich radome has wave band selectivity;When electromagnetic wave irradiates to the surface of wideband sandwich radome based on double-band super surface, two transmission poles are generated in low frequency band to form second-order band-pass filter response, and three transmission poles are generated in high frequency band to form third-order band-pass filter response.The advantages are: the wideband sandwich radome has the excellent characteristics of double-band wideband wave transmission, large-angle stability, out-of-band steep cutoff, adjustable frequency ratio of wave transmission band center frequency, polarization insensitivity and the like by the above structure, and the overall structure is simple and easy to process.

The invention discloses an integrated impedance measurement system adaptive to a biological signal acquisition front end. The integrated impedance measurement system comprises a sine wave current generator, a band-pass filter, an amplifier module BPFA, a multiplexer and an analog-to-digital converter ADC which are communicated in sequence, the sine wave current generator is used for generating low-amplitude alternating current for measuring tissue-electrode impedance, and the alternating current acts on a measured electrode to generate corresponding alternating voltage; the band-pass filter and amplifier module BPFA is used for amplifying and filtering the AC voltage; an analog-to-digital converter (ADC) receives the amplified and filtered alternating voltage through a multiplexer to perform digital signal conversion, and tissue-electrode impedance measurement of the measured electrode acting on the tissue is completed; according to the invention, the amplitude of the AC voltage is controlled to accurately adapt to the + / -5mV input range of the existing acquisition front end, and the amplification and filtering modules are directly multiplexed to complete impedance signal processing without additionally configuring a special analog front end for impedance measurement, so that the integration level and the stability of a chip are improved.

Provided herein are devices, systems, and methods for performing narrow band Raman Spectroscopy on cells. The method can include incubating the cells with a compound of a known Raman spectrum to determine viability of the cells in the presence of other compounds. The system can include one or more of a light source, a compound dispenser, a band pass filter, a light detector, and processors coupled to the detector.

The invention discloses a reinforcement learning algorithm-based low-frequency oscillation online suppression method for a double-fed fan wide-area additional damper, and the method comprises the following steps: obtaining the operation data of a wind power generation system, including the wind speed, the fan output power, the rotating speed and the power grid frequency; preprocessing the acquired data, and performing detrending and normalization processing by using a band-pass filter; using a depth deterministic strategy gradient algorithm to train the model to predict the operation state of the fan and the oscillation condition of the system; based on the trained depth deterministic strategy gradient algorithm model, an optimal damping control strategy is generated, and operation parameters of the draught fan are adjusted in real time; the generated damping control strategy is applied to a fan control system, the damping characteristic of the system is improved, and low-frequency oscillation is reduced.

The invention discloses a vibration drift removal and compensation method for atom interference measurement, which sequentially comprises the following steps of: carrying out atom interference continuous measurement, acquiring a voltage signal by an accelerometer, enabling the voltage signal to pass through a band-pass filter circuit, acquiring the voltage signal by a main control system, converting the voltage signal into an acceleration signal, and converting the acceleration signal into a vibration phase. The acceleration signal average value is converted into a vibration phase, vibration phase linear fitting, interference measurement period vibration phase drift removal and interference fringe fitting are carried out to obtain an interference phase, and the interference phase calculates a measured physical quantity; according to the method, data processing such as filtering, smoothing, linear fitting and deduction is carried out on signals collected by the accelerometer, suppression of time drift and temperature drift existing in relative acceleration measurement of the accelerometer is achieved, and measurement noise introduced by ground vibration is greatly reduced.

The application provides a method for improving the precision of blood vessel information extraction in OCTA live imaging, comprising the following steps: performing two-dimensional wavelet decomposition on an image to obtain a low-pass frequency component, a horizontal structure detail component, a vertical structure detail component and a diagonal structure detail component; selecting the vertical structure detail component to perform fast Fourier transform to obtain a frequency spectrum diagram of the vertical structure detail component; performing frequency domain filtering on the frequency spectrum diagram of the vertical structure detail component by using a band-pass filter to obtain a filtered frequency domain signal; performing inverse fast Fourier transform on the filtered frequency domain signal and wavelet inverse transform to reconstruct a filtered image; comparing each pixel point in the reconstructed filtered image and the original image and taking the minimum value; iteratively performing the above process multiple times to reconstruct a deep denoising image; and the application can effectively remove the stripe motion artifacts existing in the OCTA live imaging result, and has very good reservation capability for image quality and blood vessel information.

A self-excitation microwave sensor suitable for non-destructive testing of metal mesh film, belonging to microwave sensor technology, comprising a resonant sensing structure, a microwave amplifier, a phase shift element, a band-pass filter, a radio frequency detector, a digital-to-analog converter and a microprocessor; wherein the resonant sensing structure, the microwave amplifier, the phase shift element and the band-pass filter form a self-excitation oscillation loop, the resonant sensing structure has a band-pass characteristic, is located in the feedback branch of the loop, the resonant frequency thereof is consistent with the center frequency of the band-pass filter, and the loop gain and the phase shift satisfy the self-excitation oscillation condition at the frequency; by reasonably setting the gain of the microwave amplifier and collecting the self-excitation oscillation signal power in real time, the sensor can realize detection of sub-millimeter width crack damage and identification of high square resistance samples, has high detection sensitivity, compact structure, small volume and low cost, does not need other external microwave analysis instruments, and can be applied to on-site non-destructive testing of metal mesh film.

The application discloses a fundamental wave extraction method under frequency offset based on a linear neural network, and has the advantages of high extraction accuracy, adaptability to frequency disturbance and the like. A traditional digital band-pass filter cannot change its center frequency after design, when the frequency and amplitude of an input signal are offset, the output signal of the traditional digital filter will be phase-shifted and attenuated to different degrees in amplitude, and even waveform distortion will occur, so the traditional digital band-pass filter needs to be redesigned, which is complicated and greatly increases the design cost. The band-pass digital filter against frequency offset based on the adaptive linear neural network can adaptively filter according to the frequency and amplitude changes of the input signal, and thus has strong robustness for frequency-amplitude random fluctuation signal detection, and can be applied to fundamental wave signal extraction of power grid voltage / current and the like.

A radio frequency front-end circuit includes a first diplexer, an extractor, and a second diplexer. First diplexer is coupled to an antenna for receiving a radio frequency signal and configured to separate radio frequency signal into a first signal within low, mid and high bands of a wireless wide area network and a second signal within an ultra-high band of WWAN. Extractor is coupled to first diplexer. Extractor includes two band pass filters and a band rejection filter. Two band pass filters are configured to extract two global navigation system signals within two global navigation system bands from first signal. Band rejection filter is configured to allow a third signal within the mid and high bands of WWAN in first signal to pass. Second diplexer is coupled to first diplexer and extractor and configured to combine second and third signals into a WWAN signal.