12 results about "Harmonic mixer" patented technology

The invention relates to the technical field of terahertz photoelectric detection. A traditional terahertz frequency mixer generally adopts a semiconductor material with a low dielectric constant, the heat dissipation requirement of a high-frequency circuit is difficult to meet, the dielectric loss of a traditional substrate structure is remarkably increased along with the increase of the frequency of the frequency mixer, a large amount of energy loss is generated when a signal is transmitted in a micro-strip, and the transmission efficiency of a high-frequency signal is influenced; the invention provides a terahertz harmonic mixer structure of a hollow structure substrate and a preparation method thereof, a quartz substrate with a hollow structure is provided with a mixer circuit, the quartz substrate is arranged between a mixer upper cavity and a mixer lower cavity, and the quartz substrate is combined with a metal structure to realize transmission of terahertz signals. The thermal performance of the mixer is improved by the hollow structure, so that the mixer has better stability in a high-temperature environment, parasitic parameters are changed by modifying the structure of the quartz substrate, the impedance matching efficiency is improved, and the mixer is ensured to work stably and efficiently under the terahertz frequency.

The application discloses an ultra-wideband odd harmonic frequency mixer for frequency spreading, and belongs to the technical field of planar harmonic frequency mixing, and comprises a first microstrip line, a Marchand balun, a first Schottky diode, a second Schottky diode, a matching circuit and a second microstrip line; the first microstrip line is located at a radio frequency input end and is connected with a non-balanced end of the Marchand balun, two balanced ends A and B of the Marchand balun are respectively connected with an anode of the first Schottky diode and a cathode of the second Schottky diode, the cathode of the first Schottky diode and the anode of the second Schottky diode are connected in sequence and are connected with the matching circuit and the second microstrip line in sequence, and the second microstrip line is connected with a local oscillator / intermediate frequency port. The harmonic frequency mixer can be directly used for frequency expansion of an existing mainstream frequency spectrometer, and the expansion range can cover the bandwidth of two to three standard waveguide frequency bands.

The utility model provides a miniaturized unified Ka frequency band up-conversion channel convenient to disassemble, which comprises a packaged structural member, an upper cover plate, and a radio frequency module, a frequency conversion module, an intermediate frequency module and a Ka frequency band filter which are connected in the structural member, and the structural member is provided with a unified area and a filter area. According to the utility model, the broadband harmonic mixing chip, the numerical control attenuator chip and the amplifier chip which can cover all Ka frequency bands are selected, the Ka up-conversion module is divided into a filter area and a unified area, variables caused by all customized up-conversion channels are concentrated in the filter area, and the filters are replaced by being connected with the unified area through the gold wires, so that the replacement efficiency is improved. The model selection of each chip, the design of a printed board, the position of an external interface and the like of a unified region are not influenced; the radio frequency interface, the intermediate frequency interface and the local oscillator interface are SMP interfaces, outlets of the low-frequency connector and the intermediate-frequency SMP connector face downwards, and SMP-KK can be directly used for direct insertion during follow-up assembly and test, so that assembly and test are facilitated.

The application relates to a Schottky diode-based terahertz frequency conversion component and belongs to the technical field of terahertz communication, wherein the frequency conversion component comprises a local oscillator frequency multiplication link, a terahertz subharmonic mixer and a waveguide filter which are electrically connected in sequence, and the terahertz subharmonic mixer is also electrically connected with an intermediate frequency filter. The Schottky diode is used to manufacture a Q-band tripler, the manufacturing cost is extremely low, the design difficulty of the local oscillator link is reduced, the local oscillator frequency demand is reduced by the harmonic mixer, the testability of the local oscillator link is improved, and the troubleshooting cost and time are reduced.

Disclosed is an antenna-sub harmonic mixer block, which includes a dielectric block disposed on a PCB substrate having a ground surface, an antenna including first antenna patch provided on the dielectric block and having a metal patch and a slot, and a second antenna patch provided on the dielectric block, spaced apart from the first antenna patch to surround the first antenna patch, and that receives a ground voltage at the same potential as the ground surface of the PCB substrate, an RF ground wire disposed on the dielectric block and connected from the first antenna patch to a surface having the same potential as the ground surface, an RF switching stage disposed on the dielectric block, connected to the first antenna patch, and that provides a switching ON / OFF operation in conjunction with the RF ground wire depending on a magnitude of a local signal LO.

The application discloses a terahertz second harmonic mixer and an integrated circuit, and relates to the technical field of terahertz, and the terahertz second harmonic mixer comprises: a reverse-parallel diode pair and an intermediate frequency output circuit; the reverse-parallel diode pair is composed of two reverse-parallel Schottky diodes based on HEMT process compatibility; the reverse-parallel diode pair is connected with the intermediate frequency output circuit; wherein the transmission medium for connecting the reverse-parallel diode pair with the intermediate frequency output circuit is a coplanar waveguide; the reverse-parallel diode pair is used for frequency mixing received radio frequency signals and local oscillator signals and generating mixed frequency signals, and the intermediate frequency output circuit is used for filtering the mixed frequency signals and outputting. The application can solve the problems of high power consumption of the mixer in the prior art and high difficulty of monolithic integration of the mixer and the HEMT semiconductor device.

The application provides a full-band terahertz harmonic mixer based on an improved grounding structure, and belongs to the technical field of terahertz devices. Double improved grounding structures are symmetrically arranged near the diode of a traditional mixer to replace a traditional radio frequency grounding circuit, so that the electrical length of a local oscillator signal input loop can be greatly reduced, the influence of a grounding structure parasitic effect on radio frequency input performance can be reduced, the divergence degree of an optimal embedded impedance curve of a local oscillator port can be reduced, the bandwidth of a mixing circuit can be improved, and the complexity of matching work of the mixing circuit can be reduced.

According to the ultra-wideband balanced second harmonic mixer based on the Schottky diodes, a waveguide structure is used for providing anti-phase local oscillation signals for two pairs of anti-parallel diodes, balanced second harmonic mixing is achieved so as to improve spurious suppression, a grounding bonding pad provides a grounding loop for the diodes, and therefore the spurious suppression effect is improved. The waveguide matching unit and the suspended microstrip unit are utilized to realize broadband low-loss matching, the radio frequency probe converts a suspended microstrip mode into standard waveguide output and realizes isolation from an intermediate frequency and a local oscillator to a radio frequency port, and the intermediate frequency filter is utilized to realize isolation from the local oscillator and a radio frequency to an intermediate frequency port. The first substrate and the second substrate are both made of low-loss and low-cost quartz. The ultra-wideband balanced second harmonic mixer based on the Schottky diode provided by the invention has the advantages of low frequency conversion loss, high spurious suppression, wide bandwidth and low cost, and has a wide application prospect in a terahertz transmit-receive system.

The invention relates to a terahertz frequency conversion assembly based on a Schottky diode, and belongs to the technical field of terahertz communication, the frequency conversion assembly comprises a local oscillator frequency multiplication link, a terahertz subharmonic mixer and a waveguide filter which are electrically connected in sequence, and the terahertz subharmonic mixer is further electrically connected with an intermediate frequency filter. According to the Q-band frequency tripler, the Schottky diode is used for manufacturing the Q-band frequency tripler, the manufacturing cost is extremely low, the design difficulty of a local oscillation link is reduced, the local oscillation frequency requirement is reduced through the harmonic mixer, the testability of the local oscillation link is improved, and the troubleshooting cost and time are reduced.

Disclosed are example embodiments of harmonic mixer. The harmonic mixer including a multi-phase LO signal generator. Each phase of the multi-phase LO signal generator outputting an LO signal on a signal line. The harmonic mixer including a plurality of mixers. Each mixer of the plurality of mixers connected to a signal line. The mixer driven by an IF. The harmonic mixer including an output network coupled to the outputs of the plurality of mixers.

This disclosure provides a plasma density measurement system, relating to the field of microwave technology, comprising: a low-frequency power divider for dividing a first low-frequency signal into a low-frequency reference signal and a low-frequency local oscillator signal; a frequency multiplier module for multiplying the second low-frequency signal to generate a high-frequency microwave signal; a high-frequency power divider for dividing the high-frequency microwave signal into a high-frequency reference signal and a high-frequency detection signal, wherein the high-frequency detection signal is used to penetrate the plasma under test to generate a detection and reception signal; a harmonic mixer, including a reference harmonic mixer and a detection harmonic mixer, wherein the reference harmonic mixer is used to mix the low-frequency reference signal and the high-frequency reference signal to generate an intermediate-frequency reference signal; the detection harmonic mixer is used to mix the low-frequency local oscillator signal and the detection and reception signal to generate an intermediate-frequency detection signal; and a data acquisition card for determining the density of the plasma under test based on the phase of the intermediate-frequency reference signal and the intermediate-frequency detection signal. This system can measure the density of various types of plasmas.

Disclosed is a harmonic mixer including N transistors, an RF terminal, N LO terminals, an IF terminal, a series resonant circuit, and an IF matching circuit, in which when the RF frequency of a high frequency signal is identical or close to the maximum oscillation frequency of the transistors, the impedance seen from the IF terminal toward an output terminal at the RF frequency becomes low, and the impedance seen from the IF terminal toward the output terminal at an IF frequency is the combination of the impedance of the series resonant circuit and the impedance of the IF matching circuit.