12 results about "Smith chart" patented technology

A high-frequency front-end circuit (10A) that has the following features: a triplexer circuit (20A) comprising a first transmit filter (211), a receive filter (221) and a second transmit filter (212), wherein one end of the first transmit filter (211) and one end of the receive filter (221) and one end of the second transmit filter (212) are connected to each other by a common junction; a low-noise amplifier (LNA); and a phase adjustment circuit (30A) that is connected between the receive filter (221) and the low-noise amplifier (LNA), where the first transmit filter (211) is set such that a fundamental frequency of a first transmit signal in a first communication band falls into a passband of the first transmit filter (211), the receive filter (221) is set such that a fundamental frequency of a received signal in the first communication band falls into a passband of the receive filter (221), the second transmit filter (212) is set such that a fundamental frequency of a second transmit signal in a second communication band, which differs from the first communication band, falls into a passband of the second transmit filter (212), where the transmission of the second transmit signal and the reception of the received signal are carried out simultaneously, wherein, assuming that a Smith chart is divided into four quadrants by a first line representing pure resistance and by a second line connecting points along an outer periphery of the Smith chart, each with a phase of 90°, and a reference impedance point, the phase adjustment circuit (30A) performs a phase adjustment such that, at a harmonic frequency of the second transmit signal, a quadrant in which a phase of the low-noise amplifier (LNA) is present when viewed from the receive filter (221), and a quadrant in which a phase is present when viewed from the low-noise amplifier (LNA) towards the receive filter (221), are not in a conjugate relationship.

The invention relates to an antenna assembly and electronic equipment. The antenna assembly includes: an antenna; a first switching circuit; the power amplifier outputs radio frequency signals of different frequency bands to the antenna through the first switching circuit; the first matching circuit is electrically connected between the first end of the first switching circuit and the antenna, and the first matching circuit comprises a first passive device; the second matching circuit is electrically connected between the second end of the first switching circuit and the output end of the power amplifier, and the second matching circuit comprises a second passive device; wherein the parameter of the first passive device and the parameter of the second passive device are matched with the target frequency band of the radio frequency signal, and the parameter of the first passive device is used for turning the power of the radio frequency signal of the target frequency band to the center of a corresponding equal output power curve; the parameters of the second passive device are used for enabling the center of the equal output power curve to turn to a matching point of the Smith chart.

The application discloses a high-symmetry ultra-wideband gallium nitride power amplifier power combination network, which is applied to the field of monolithic microwave integrated circuits and aims at the problem that, in the Ku wave band, the long secondary power combination transmission line seriously deteriorates the high-frequency characteristics of the existing tree-shaped power combination network and cannot meet the high-frequency and ultra-wideband requirements; the power combination network transistor of the application adopts X-shaped layout, so that the power combination network structure is axially symmetrical in the horizontal direction and the vertical direction and is centrally symmetrical relative to the secondary power combination point, the symmetry and the large-signal even-mode stability of the power combination network are improved, and the heat dissipation of the chip is facilitated, and the thermal stability is improved; the application also utilizes a two-order L-C low-pass matching network to make impedance transformation in the ultra-wideband be located in the low-Q value area of a Smith chart, and the high-frequency bandwidth and the insertion loss are further improved.

A Doherty amplifier includes a distributor, a first amplifier, a second amplifier, a third node, an impedance conversion circuit having a first end connected to a first node and a second end connected to the third node, and rotating an impedance viewed from the first amplifier to the third node with respect to an impedance viewed from the first amplifier to the first node within a range of 360°±45° on a Smith chart in a second harmonic wave, and a harmonic tuning circuit having a third end connected to a line connecting the first amplifier and the third node at the first node, and making an absolute value of an impedance with respect to a reference potential at the third end in the second harmonic wave smaller than an absolute value of an impedance with respect to the reference potential at the third end in the fundamental wave.

The application provides a filter power capacity improvement method, device, storage medium and filter element. The filter power capacity improvement method comprises the following steps: setting the port impedance of a bulk acoustic wave filter as a first impedance, so that the power density of a resonator in the bulk acoustic wave filter is less than or equal to a preset threshold value, wherein the first impedance is a complex impedance, and the impedance value of the first impedance is on a circle with a conductance equal to 1 in a Smith chart; determining an impedance transformation network connected to the port of the bulk acoustic wave filter according to the first impedance, the impedance transformation network being used to be connected to the bulk acoustic wave filter to form a connection body, and making the port impedance of the connection body a preset impedance value. The application has a good effect of improving the power capacity of the bulk acoustic wave filter.

The application discloses a dynamic impedance matching device, an antenna device and a dynamic impedance matching method, and the structure of the device comprises a main transmission path connected with input / output ports; at least one branch matching path is connected in parallel to the main transmission path through a node, and each branch matching path comprises a variable phase shifter and an open circuit or a short circuit terminal; by independently adjusting each variable phase shifter, the reflection coefficient of any load impedance is iteratively converged to a matching area of a Smith chart, and dynamic impedance matching is realized. Compared with the prior art, the impedance matching device has dynamic impedance matching capability, solves the problem that a fixed matching network cannot adapt to impedance conversion, and solves systematic technical defects such as inability to continuously adjust and long-term stability, and can meet the strict requirements of a modern microwave system on a wide frequency band and high reliability.

In an Advanced Antenna System, a desired power amplifier, PA, load distribution, which counters the mismatch of active impedance load, is achieved by altering the lengths of routing traces connecting PA outputs and corresponding antenna elements / subarrays. The combined output performance in the beam during active impedance load is then restored to the matched condition performance. This can be visualized as distributing the load impedance more evenly—ideally, on a circle—on a Smith chart.

This invention provides a method for characterizing the matching performance of broadband microwave circuits and a microwave circuit design method, relating to the field of computer-aided microwave circuit design technology. This invention plots the circuit's return loss frequency response curve on a Smith chart and draws a bounding rectangle that meets certain conditions according to physical and geometric principles. The matching performance of the microwave circuit is characterized by the distance L from the center point N inside the bounding rectangle to the center point O of the Smith chart and the area W of the bounding rectangle. A dimensionless value is obtained by dividing the distance L by a unit distance, and a dimensionless value is obtained by dividing the area W by a unit area. Based on a weighted sum of these values, the matching performance of the microwave circuit is comprehensively characterized. This invention has clear physical meaning, is simple and convenient to apply, and has strong universality. It can be widely used in the autonomous optimization design of microwave circuits based on artificial intelligence algorithms such as machine learning, significantly improving the design efficiency and accuracy of broadband microwave matching circuits.

The present application provides a broadband microwave circuit matching performance characterization method and a microwave circuit design method, and relates to the technical field of computer-aided microwave circuit design.The present application draws the circuit return loss frequency response curve on the Smith chart, and draws the surrounding rectangle meeting the conditions according to the physical and geometric principles, so as to characterize the matching performance of the microwave circuit by the distance L from the center point N of the surrounding rectangle to the center point O of the Smith chart and the area W of the surrounding rectangle; a dimensionless value obtained by dividing the distance L by the unit distance, a dimensionless value obtained by dividing the area W by the unit area, and the weighted sum based on the sum are used to comprehensively characterize the matching performance of the microwave circuit.The present application has clear physical meaning, simple and convenient application, strong universality, and can be widely applied to the autonomous optimization design of the microwave circuit based on the artificial intelligence algorithm such as machine learning, so as to greatly improve the design efficiency and design accuracy of the broadband microwave matching circuit.

The invention discloses a ceramic antenna rapid test system based on a network analyzer, and the system comprises the network analyzer which is used for measuring a signal reflected by an antenna so as to quantify the inherent electrical performance characteristics of the tested ceramic antenna, and recording the inherent electrical performance characteristics as electrical performance parameters; the automatic setting calibration module is used for automatically marking a center frequency point for the electrical performance parameter on a Smith graph based on a center frequency automatic identification algorithm of a minimum standing-wave ratio point, and providing visual feedback on a human-computer interaction interface; the master slice parameter learning module is used for recording electrical performance parameters of the master slice by taking the master slice as a reference and comparing the electrical performance parameters with subsequent sample slice parameters as reference data; the sample piece test comparison module is used for connecting a sample piece after a user inputs an error range based on master slice parameters, testing frequency and impedance parameters of the sample piece, comparing a test result with master slice performance parameters, and judging whether an error is met or not; and a result judgment output module.

The application relates to a power amplifier manufacturing method for improving power backoff efficiency, and belongs to the technical field of radio frequency microwave circuits, and comprises the following steps: step 1: based on the load characteristics of an active device, the optimal efficiency impedance point under linear output power is determined as the optimal impedance of amplifier design; step 2: the determined optimal impedance is pulled out by using a load pulling technology or LOADPULL, and is drawn on a SMITH chart; step 3: based on the optimal impedance obtained by pulling, an equal Q matching technology is adopted to realize low-loss impedance matching, compatibility of loss and bandwidth, impedance variation and frequency band shaping are completed; step 4: a two-stage or multi-stage cascade amplification structure is adopted, the gate voltages of front and rear active devices are controlled, and nonlinear compensation is realized by using gain compression and expansion characteristics of the front and rear stages; the application has the beneficial effects that the optimal efficiency impedance point under linear output power is selected as the optimal impedance of amplifier design, the amplifier maintains higher linear output power, and has higher backoff efficiency.

High-frequency front-end circuitry featuring the following characteristics: a demultiplex circuit (20) comprising a transmit filter (21, 21A, 212) configured such that a fundamental frequency band (ft0) of a transmit signal lies in a passband of the transmit filter (21, 21A, 212) and a receive filter (22) configured such that a fundamental frequency band (fr0) of a receive signal lies in a passband of the receive filter (22), wherein an end of the transmit filter (21, 21A, 212) and an end of the receive filter (22) are electrically connected via a common connection point provided between them; a power amplifier (PA) electrically connected to another end of the transmit filter (21, 21A, 212); and a phase adjustment circuit (30) which is electrically connected between the power amplifier (PA) and the transmit filter (21, 21A, 212), where, assuming that a Smith chart is divided into four quadrants by a first line indicating pure resistance and a second line connecting points of 90° phases on the outer circumference of the Smith chart to a reference impedance point, The phase adjustment circuit (30) performs a phase adjustment such that at the fundamental frequency (fr0) of the received signal, a quadrant in which a phase of the power amplifier (PA) is present, viewed from the transmit filter (21, 21A, 212), and a quadrant in which a phase is present, viewed from the power amplifier (PA) to the transmit filter (21, 21A, 212), are not in a conjugate relationship.