30 results about "Return loss" patented technology

This invention provides a partial discharge detection method based on the insertion depth constraint of an ultra-high frequency (UHF) sensor. The method includes: obtaining the physical parameters of an external UHF sensor; detecting the return loss curve of the external UHF sensor in a laboratory environment using a GTEM chamber; calculating the minimum insertion depth of the external UHF sensor at the joint based on the physical parameters of the transformer equipment; calculating the maximum allowable insertion depth of the external UHF sensor based on the internal structural dimensions and insulation safety requirements of the transformer; determining the effective insertion depth range of the external UHF sensor; and measuring the partial discharge signal of the transformer. This invention utilizes a formula to calculate the reasonable insertion depth range of the external UHF sensor at the transformer tank joint, thereby solving the problems of installation depth dependence on experience and poor detection consistency in existing technologies.

This utility model discloses an electro-optic modulator and an optical communication system. The electro-optic modulator includes: a housing, a cover plate, a modulator chip, an optical input port, an optical output port, an RF signal input, and an internal component. The housing has a cavity and an opening, and the cover plate is used to seal the opening. The modulator chip is disposed within the cavity. The optical input port and the optical output port are both connected to the modulator chip. The RF signal input is connected to the modulator chip. The internal component is disposed within the cavity and connected to the housing. The modulator chip is disposed between the housing and the internal component. By placing the internal component within the cavity of the electro-optic modulator housing and placing the modulator chip between the housing and the internal component, the space around the modulator chip can be significantly reduced, signal resonance can be reduced, return loss can be lowered, and the bandwidth of the electro-optic modulator can be increased.

An electronic system having a mounting substrate with a plurality of layers. The mounting substrate combines an upper shield structure and a lower shield structure to form an interlocking shielding structure to reduces crosstalk interference and improve return loss and insertion loss for high-speed serial communication circuits. The upper shield structure and the lower shield structure have a series of grounded reference shields that reduce unwanted electrical signal interferences.

A thermally adaptive antenna system having an antenna structure, an EM) power signal, a DC power signal, an impedance tuner, a temperature sensor in the antenna, a DC-DC conversion component, and a microcontroller. The microcontroller provides a tuning command to the impedance tuner, causing the impedance tuner to compensate for an impedance change in the antenna due to a temperature change in the antenna. An environmentally adaptive antenna system has an antenna structure, an EM power signal, a DC power signal, an EM power splitter, a directional coupler, a reference receiver, a measurement receiver, an impedance tuner, and a controller. The controller calculates antenna impedance change based on observed changes in return loss, calculates a corresponding correction to the antenna impedance, and sends a command to the impedance tuner to implement the correction to the antenna impedance.

This utility model belongs to the field of filters, specifically a coaxial-to-waveguide filter, including a cavity with a waveguide port on the inner side. A coaxial connector is bolted to the top side of the waveguide port. Multiple resonant cavities are formed inside the cavity, and a coupling grounding post is installed inside the cavity through the resonant cavities. A coupling conductor is fixed between the waveguide port and one of the resonant cavities through a supporting insulating medium. One end of the coupling conductor is soldered to the coupling grounding post in the corresponding resonant cavity, and the other end extends into the waveguide port, realizing bidirectional coupling transmission of electromagnetic waves. This utility model introduces cross-coupling technology inside the filter, which significantly improves the out-of-band suppression compared to relying on natural attenuation, reduces the number of resonant cavities required to achieve the same suppression, thereby effectively reducing the product size and also reducing the filter insertion loss. This device achieves low port return loss through high out-of-band suppression.

This invention discloses a suboctave band equalization structure and a method for optimizing in-band flatness based on it, relating to the technical field of microwave circuits. The suboctave band equalization structure consists of a 50-ohm microstrip line, an absorption resistor, and a high-impedance line. The high-impedance line employs an S-shaped bend structure to reduce volume, and the absorption resistor's geometric dimensions are adjusted to precisely control the equalization depth. This invention utilizes the transmission characteristics of a resonator exhibiting high insertion loss at the center of the band and gradually decreasing insertion loss at both sides when the fundamental frequency reaches the second resonant frequency. This complements the transmission characteristics of a filter, which has low insertion loss in the center of the passband and gradually increasing insertion loss at both sides. This application can significantly improve in-band flatness by physically canceling passband edge losses through passive microstrip circuits while ensuring high matching performance with return loss better than -20dB. It has advantages such as simple structure, easy integration, and strong engineering applicability.

This invention aims to provide a miniaturized filter, comprising a dielectric substrate, resonator units, and adjustable capacitors. The filter is characterized by: multiple sets of resonator units arranged side-by-side on the dielectric substrate, with gaps between adjacent resonator units; each set of resonator units has an identical structure and is symmetrical; each set of resonator units is loaded with an adjustable capacitor; the left side of the first set of resonator units and the right side of the last set of resonator units are respectively provided with port coupling lines, and each of the two sets of port coupling lines has a port. This invention enables miniaturization while maintaining low return loss, ensuring high-quality signal transmission.

A low-profile, highly isolated, ultra-wideband multiple-input and multiple-output (MIMO) antenna for use in a distributed antenna system includes: (a) a feeding circuit on a dielectric substrate that includes a coplanar waveguide (CPW) including a signal feed and a return that includes first and second return sections coplanar with and apart from the signal feed; (b) first and second radiator circuits including first and second monopole radiators, respectively, the first and second return sections being coplanar with and spaced apart from the first monopole radiator; (c) a decoupling circuit, disposed on a first side of the dielectric substrate, that includes a conductive strip for reducing mutual coupling between the first and second radiator circuits; and (d) a matching circuit including a plurality of stubs disposed on a second side of the dielectric substrate opposite the first side, the matching circuit being operable to reduce return loss of the MIMO antenna.

The application discloses an ultra-wideband GaAs amplitude-phase control transceiver front-end chip, which is applied to the field of phased array radars, and aims at the fact that high-low pass type phase shifters adopted in existing transceiver front-end chips are only applicable to low-frequency phase shift units, and are limited by the problem of filter order; the application proposes a novel phase shift structure based on a magnetic coupling all-pass network and an active complementary dual-mode amplification circuit, the structure can realize a great expansion of available frequency on the premise of ensuring phase shift precision, and a 180-degree phase shift network based on an active structure can effectively provide transmission gain, reduce the number of used link amplifiers, further reduce the noise coefficient of a receiving link and assist in improving the power characteristics of a transmitting link. The application of the technology helps to realize good phase shift precision, input and output return loss and lower phase shift error of the chip in an ultra-wideband range of 2-18GHz.

1. Name of the product in this design: Automatic Insertion Loss Tester. 2. Purpose of this design: To measure the insertion loss and return loss of fiber optic devices or optical links. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1. 5. Other situations requiring explanation: The enlarged view of part A is an enlarged view of part A in the 3rd view of the perspective drawing.

This invention belongs to the field of radio frequency integrated circuits, specifically providing a 6-18GHz radio frequency digital phase shifter, comprising cascaded 5.625° phase shifting units, 22.5° phase shifting units, 11.25° phase shifting units, 45° phase shifting units, 180° phase shifting units, and 90° phase shifting units to achieve 64 phase shift states with an accuracy of 5.625° within an ultra-wideband 360° range. In this invention, each phase shifting unit employs a slightly different topology to meet different phase shift requirements, achieving a balanced performance across phase shift error, insertion loss, return loss, amplitude error, and circuit area. Ultimately, this invention offers advantages such as small phase shift error, small amplitude error, and small circuit area.

A 2-70GHz ultra-wideband, all-metal Vivaldi antenna includes a metal plate with a supporting base plate at its bottom. A coaxial connector passes through the supporting base plate and connects to the metal plate. An exponentially tapered curve opening is formed on the upper inner side of the metal plate, and a matching circle is formed on the lower part of the metal plate. An inclined slot is formed on the metal plate between the exponentially tapered curve opening and the matching circle. The starting end of the exponentially tapered curve opening is connected to one end of the inclined slot, and the other end of the inclined slot is connected to the matching circle. The inner conductor of the coaxial connector contacts the upper surface of the end where the inclined slot and the matching circle are connected. Traditionally designed Vivaldi antennas rarely operate at frequencies of 40GHz and above. This Vivaldi antenna, by optimizing the thickness of the Vivaldi metal plate, allows the antenna sample to operate at frequencies greater than 70GHz with a return loss exceeding 10dB. This invention features a simple structure, low cost, ultra-wideband capability, and stable radiation pattern.

This application provides a drilling fluid flow control device to improve the reliability of MWD signals. It addresses the problem of poor MWD signal transmission stability during annular return loss in drilling operations. The device includes a slidingly sleeved outer shell assembly and a sliding flow control assembly, with a return spring between the sliding flow control assembly and the outer shell assembly. The outer shell assembly includes an upper connector assembly, and the sliding flow control assembly includes a flow control upper sleeve. The outer wall of the flow control upper sleeve has several first inlet holes communicating with its inner bore. When the return spring is in a free state, all the first inlet holes are connected to the inlet end of the upper connector assembly. An air bladder is installed inside the upper connector assembly. When the air bladder is inflated, the sliding flow control assembly slides along the inner wall of the outer shell assembly, blocking some or all of the first inlet holes from the inlet end of the upper connector assembly. This application increases the flow resistance within the drill string, thereby reducing the pressure of the drilling fluid and improving the reliability of MWD signal transmission.

The application belongs to the technical field of wireless communication and electronic engineering, and particularly relates to a wideband low-noise amplifier with a frequency domain selection function, which comprises an input direct-current isolation matching network, a first-stage amplification part, an inter-stage high-pass matching network, a second-stage amplification part and an output low-pass matching network which are sequentially connected in series. Through a multi-pole-zero topology design, the wideband rejection, high port isolation, high integration and high selectivity are synergistically optimized. Within the target passband of 8-12 GHz, three transmission poles in the passband ensure excellent gain flatness, and the noise coefficient is stabilized at 0.994-1.101 dB; one transmission zero point is arranged in the lower stopband (<8 GHz) and the upper stopband (>12 GHz) respectively, the low-frequency suppression depth is greater than or equal to 50 dB, and the high-frequency suppression depth is greater than or equal to 30 dB; at the same time, the input return loss is greater than or equal to 11 dB, the output return loss is greater than or equal to 18 dB, and the port matching and isolation performance are excellent. The application is based on a GaAs 0.15 mu m MMIC planar integration process, and compared with a discrete cascade scheme, the volume is reduced by 60%, which is suitable for the development trend of high integration and miniaturization of a radio frequency front end, and can be widely applied to 5G millimeter wave communication, satellite navigation, radio frequency radar and other radio frequency front end systems with extremely high requirements for receiving sensitivity and anti-interference ability.

This specification provides an antenna assembly including a first radiating stub, a signal feed point, and a ground reference point. The first radiating stub connects both the signal feed point and the ground reference point, and a first gap of a predetermined width exists between the first radiating stub and the ground reference point. By reducing the gap between the first radiating stub and the ground reference point, the coupling of the antenna assembly is increased, thereby increasing the bandwidth of the passive return loss waveform and optimizing the passive return loss of the antenna assembly.

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 application discloses a radar antenna and a radar level meter, and relates to the technical field of antennas. The radar antenna comprises an antenna body, the antenna body comprises a waveguide structure and a fixing structure connected with each other, and the cross-sectional area of the fixing structure gradually increases in the direction in which the waveguide structure extends to the fixing structure; a lens structure is arranged in a containing cavity of the fixing structure, the peripheral surface of the lens structure is arranged in close contact with the inner surface of the fixing structure, the lens structure is provided with a first phase calibration part, the first phase calibration part is provided with a first surface, the first surface faces a waveguide cavity of the waveguide structure, and the first surface is opposite to the inner surface of the antenna body. The application can solve the problem that the echo loss of the radar antenna is large.

This invention relates to a common-mode filter. High-frequency characteristics are further improved in a common-mode filter where a pair of wires cross midway. The filter includes wires (W1, W2) wound in the same direction around a core portion (23). The wires (W1, W2) form three winding blocks (B1 to B3), and cross each other in the region between winding blocks (B1) and (B3), and in the region between winding blocks (B2) and (B3). According to the invention, the number of winding blocks is odd; therefore, if the wires (W1) and (W2) cross an even number of times between axially adjacent winding blocks, the positional relationship of one end of the wires (W1, W2) can be made consistent with the positional relationship of the other end. Thus, since the conditions of one end of the wires (W1, W2) are consistent with the other end, high-frequency characteristics such as reflection characteristics (return loss) and noise conversion characteristics can be improved.

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 application relates to an optimized signal path design method for high-frequency signal transmission, comprising the following steps: constructing a 3D model under high-frequency electromagnetic field simulation, taking key geometric dimensions as variables; performing TDR simulation analysis on the 3D model to obtain a capacitive impedance drop result, setting a reverse pad structure according to the capacitive impedance drop result, and removing non-functional pads; fusing the reverse pads in the reverse pad structure by using a differential, performing S parameter simulation on the fused model, taking the optimal return loss in a target frequency band as a preliminary optimization target function, and further adjusting the key geometric dimensions by using an optimizer until the S parameter curve generated by simulation meets the template requirements of a standard, so that an optimal PCB package is obtained.

The utility model relates to printed circuit board technical field especially, relates to a kind of printed board and electronic equipment using the printed board.The electronic equipment of the utility model improves the via structure on the existing printed board, the size of the back pad is specially designed, the dielectric capacity on the printed board is better reduced, the impedance of the two signal vias of the same pair of differential signals is separately controlled respectively, the local impedance of the two vias is guaranteed, the impedance of the same pair of differential signals at via is reduced as a whole, reaches better impedance matching effect, optimizes return loss index, finally makes the signal transmission quality of electronic equipment higher.

This invention provides a rectangular input waveguide and its design method. The rectangular input waveguide includes an input waveguide, an output waveguide, N tapered segments arranged along a first direction, and intermediate segments located between adjacent tapered segments. The first direction is the direction from the input waveguide to the output waveguide, where N > 1. The short side dimensions of each tapered segment gradually decrease, while the short side dimensions of each intermediate segment remain unchanged. The method includes changing the height of each tapered segment and the height of each intermediate segment to ensure that the standing wave ratio (SWR) of the rectangular input waveguide is less than a first preset threshold and the return loss is greater than a second preset threshold. This design method enables the miniaturization of the rectangular input waveguide while meeting the requirements for microwave SWR and return loss, thereby allowing nearly 100% of the output power of an external microwave source to be transmitted into the microwave tube to establish an electromagnetic field of appropriate intensity.

The application discloses a coupling structure of a solid optical fiber and a hollow optical fiber and a fixing method thereof, and belongs to the technical field of optical communication. In the coupling structure, the end of the solid optical fiber is tapered to form a smooth tapered transition zone, and the transition zone is partially inserted into the central air core of the hollow optical fiber; the top end or the side wall surface of the tapered transition zone is provided with a light beam shaping structure (a microsphere lens coated with an anti-reflection film or a subwavelength microstructure array). The application actively regulates the outgoing light field through the light beam shaping structure, realizes accurate mode field matching with different core diameter hollow optical fibers, greatly reduces the echo loss, and improves the optical signal transmission efficiency. In addition, the application cooperates with fixing processes such as direct hot melting, external glass tube fusion or point glue curing, and realizes high-strength packaging of the coupling structure of the solid optical fiber and the hollow optical fiber.

A high frequency cable assembly has a plug connector that terminates a shielded cable by a cable termination assembly mounted to a paddle card. The cable termination assembly provides a path for ground current between the cable shield and the paddle card, providing low insertion loss and return loss and crosstalk at frequencies up to at least 53 GHz, which supports data rates of 224 Gbps and above. Features of the disclosed cable termination assembly can be used individually or in combination, and include: termination of a row of cables, a configuration based on the angle at which the cables arrive at the cable termination assembly, a ground member aligned with a single cable, and an upper ground member and a lower ground member coupled with the ground structure of the cable shield and the paddle card, the upper and lower ground members at least partially surrounding the signal paths of the exterior of the cable shield. The upper and lower ground members provide ground current paths that are parallel to the signal paths at a substantially uniform spacing.

Ultra-wide band (UWB) Frasera antenna elements are disclosed, including a radiator and fencing structure having features that designed to obtain 3GPP Standards-compliant levels of performance over a 45% bandwidth for return loss, polarization discrimination, polarization isolation, and mutual coupling.

The application discloses an antenna signal adjusting method applied to a wireless switch panel, wherein the wireless switch panel comprises a wireless communication device and an antenna, and the method comprises the following steps: acquiring a return loss change curve varying with a communication frequency between the wireless communication device and the antenna respectively based on the condition that the wireless switch panel is installed in different medium types; dividing a communication frequency of the wireless communication device into multiple frequency bands, determining a frequency band where a minimum return loss in a communication frequency range is located according to the return loss change curve, and matching the frequency band with a corresponding medium type; detecting a frequency band where a resonant frequency of the current antenna is located in the communication frequency range, and adaptively adjusting based on the matching result. The application further discloses a wireless switch panel and a computer readable storage medium, which can adaptively adjust a network signal.

This invention discloses a low-return-loss, short-size fiber collimator, comprising: a first freeform surface and a second freeform surface, wherein the shapes of both the first and second freeform surfaces conform to Chebyshev polynomials; the first and second freeform surfaces are respectively the surface near the fiber end and the surface away from the fiber end in the fiber collimator; both the first and second freeform surfaces are x-axis symmetric and y-axis asymmetric; the optical power of the first freeform surface is negative, and all surfaces except those within the effective light transmission area are planes perpendicular to the optical axis. Through the above technical solution, this invention provides a single-mode fiber collimator with ultra-short element length, long working distance, high point accuracy, and low return loss.

A sensing system 100 for detecting a nitroaromatic substance, the system comprising a controller 110 with a processor 114 and memory 112 containing instructions for the processor, a capacitive sensor 120 connected to the controller, having at least two terminals 122 configured to sense a capacitance of a dielectric medium between the terminals and sending a signal to the controller, the controller processes the signal to determine the presence or absence of nitroaromatic vapour 104 in the dielectric medium. Also disclosed is a capacitative sensor which senses that the capacitance has changed to a capacitance similar to that of a nitroaromatic vapour. Also disclosed is another sensing system which additionally comprises a transmitter 124 configured to transmit a microwave towards a target, the transmitter central to a plurality of receivers configured to receive a reflected microwave signal from the target, and which act as terminals of a capacitive sensor which senses the capacitance of a dielectric medium betwene the terminals. The shift in a retun loss curve of the received signal is analysed for the presence or absense of a nitroaromatic vapour and / or an enclosure containin the same. Figure 1

The application provides a low-cost high-performance hybrid integrated coaxial line directional coupler and radio frequency module. A single-layer double-sided printed circuit board and a metal cavity are mixed and integrated, so that the number and cost of assembly parts are greatly reduced. Meanwhile, the single-layer double-sided printed circuit board and the metal cavity cooperate with each other to form an effect similar to a coaxial coupling line, so that radiation loss is effectively suppressed, field distribution is improved, and the insertion loss, coupling flatness and isolation performance of the coupler are improved. The middle part of the dielectric on the hollowed-out circuit board is removed, the phase of the transmission signal of the coupling line is compensated, and the excellent performance of the directional coupler in coupling degree, return loss, insertion loss and isolation degree is further realized. In the case of ensuring the performance of the device, the dielectric between the transmission line and the ground is reserved, and the physical stability of the device is improved.

A method for forming an optical device includes: providing a substrate, the substrate including a first substrate, a buried oxide layer on the first substrate, and a second substrate on the buried oxide layer; forming an initial third waveguide and a corresponding initial third groove in the second substrate, the initial third waveguide including an initial third starting region; forming a first dielectric layer in the initial third groove and on the initial third waveguide; removing part of the first dielectric layer and part of the initial third waveguide to form a third waveguide and a corresponding third groove in the second substrate, the third waveguide including a third starting region, a projected area of the third starting region on a surface of the substrate being smaller than a projected area of the initial third starting region on the surface of the substrate. The formed optical device can effectively reduce return loss.