10results about How to "Small reflection coefficient" patented technology

The invention discloses an antenna and electronic equipment, and belongs to the technical field of communication. The antenna comprises a low-frequency structure and a high-frequency structure parasitic to the low-frequency structure. The first conductive layer and the second conductive layer of the low-frequency structure are opposite, spaced and electrically connected to form a resonant cavity for generating low-frequency resonance; the third conductive layer of the high-frequency structure is arranged between the first conductive layer and the second conductive layer, is separately arranged with the first conductive layer and the second conductive layer at intervals, and is electrically connected with the first conductive layer, and the feed component is used for exciting the third conductive layer to generate high-frequency resonance. According to the technical scheme, dual-frequency resonance of the antenna can be achieved, the gain of the antenna can be improved, the antenna can be arranged in the intelligent terminal, and therefore the structural reliability and the appearance attractiveness of the intelligent terminal can be improved.

The present application relates to the field of optical films, and specifically discloses a method for preparing an ultra-wide-angle low-reflection composite nanostructure optical film, comprising the following steps: S1, cleaning the surface of a glass substrate, and then performing laser etching to obtain an etched glass; S2, placing the etched glass in a melamine solution, heating it to 780-800°C for treatment for 30-40 minutes, and obtaining nitrogen-doped glass after cooling; then treating the surface with boric acid and ammonia to obtain a semi-finished product; S3, coating a rare earth terbium-modified silica layer on the surface of the semi-finished product to obtain a finished product; the optical film has the advantages of ultra-wide angle, low reflectivity, and high transmittance.

The application provides a thin-layer strong-absorption mechanically adjustable three-dimensional wave-absorbing structure, which comprises a bottom plate, a plurality of basic structure units arranged in a periodic array are arranged on the bottom plate, the basic structure unit comprises a hollow frame installed on the bottom plate, a three-dimensional resistive frequency selection substructure arranged on the outer surface of the hollow frame and a nested height-adjustable metal reflection three-dimensional substructure located in the hollow frame and installed on the bottom plate; the application has the following beneficial effects: the application realizes the absorption performance of a reflection coefficient lower than -20 dB in the range of 8-18 GHz through a simple and unique three-dimensional wave-absorbing structure design, and has good oblique incidence stability; further combined with the nested height-adjustable metal reflection three-dimensional substructure, the application realizes the adjustable reflection coefficient in a wide-band range and at any incident angle, thereby meeting the demand for a new type of electromagnetic wave-absorbing material with thin layers, small area density, strong absorption, adjustable wave-absorbing performance, simple structure and good oblique incidence stability.

The present invention discloses a high-power waveguide coaxial water-cooled load, comprising a waveguide interface, a coaxial interface, a coaxial power divider, a plurality of energy absorbers and a water-cooling system connected in sequence, the waveguide coaxial water-cooled load also comprises a boss, a first connector and a second connector, the boss comprises a first section and a second section connected, the first section is located in the waveguide interface, the second section extends into the coaxial interface, the first connector is arranged in the coaxial interface, the first end of the first connector is fixedly connected to the second section of the boss; the second connector is arranged in the coaxial power divider and connected to the coaxial power divider, and an opening is provided at one end facing the first connector, the second end of the first connector is inserted into the second connector through the opening, and there is a gap between the inner wall surfaces of the first connector and the second connector. The coaxial power divider of the waveguide coaxial water-cooled load described in the embodiment of the present application evenly distributes the output, the power absorbed by the energy absorber is equal, the energy absorber works normally and is not easily damaged.

The application discloses an antenna array based on circuit antenna integration. The antenna array comprises a substrate, a first antenna, a second antenna and a transistor. The substrate comprises a base layer and a ground layer. The base layer has a first surface and a second surface arranged oppositely. The ground layer is arranged on the first surface. The first antenna and the second antenna are arranged on the second surface at intervals. The transistor is arranged on the second surface and located between the first antenna and the second antenna. The transistor has a gate, a drain and a source. The first antenna is formed with a groove on a side facing the transistor. The first antenna is connected with a first connecting line extending towards the transistor. One end of the first connecting line is connected to a groove bottom surface of the groove. The other end of the first connecting line is electrically connected with the gate. The drain is electrically connected with the second antenna. The substrate is provided with a conductive hole. The source is arranged in the conductive hole and electrically connected with the ground layer. Thus, the design of an amplification circuit is cancelled, and the loss under a microwave frequency band is reduced.

The embodiment of the invention provides an electro-optical modulator, a photon chip and a light quantum computer. The electro-optical modulator comprises a grounding electrode assembly and a signal electrode assembly. The ground electrode assembly includes a first ground electrode and a second ground electrode. The signal electrode assembly is located between the first ground electrode and the second ground electrode. The signal electrode assembly includes a positive signal electrode and a negative signal electrode. The signal electrode assembly is provided with the groove, equivalently, the current path of microwaves is prolonged, the distributed inductance of a transmission line is increased, the microwave speed is reduced, speed matching is more effectively achieved, the large distributed inductance is beneficial to increasing the characteristic impedance of the electrode, impedance matching is achieved, the reflection coefficient of radio-frequency signals is reduced, and the transmission efficiency of the radio-frequency signals is improved. Flat frequency response and higher effective driving voltage are obtained, and bandwidth and modulation efficiency are improved. The overall width of the signal electrode assembly does not change obviously, so that the transmission quality and stability of the system are ensured.

This invention provides a decoupling method for SIW wide-angle scanning antenna arrays to solve the technical problem of coupling between array elements during phased array antenna scanning. The invention discloses a decoupling method for SIW wide-angle scanning antenna arrays that uses a genetic algorithm to optimize the presence or absence of metal pillars at specific positions between array elements, introducing new coupling to cancel out the original coupling, thereby achieving decoupling. The method includes the following steps: Step 1: Metallize the surfaces of four dielectric substrates and longitudinally slot them to form array elements; Step 2: Slot two array elements on one side and slot the other two array elements on both sides, removing part of the metal wall of the array elements; Step 3: Assemble the four array elements, placing the two array elements with slots on one side at both ends and the two array elements with slots on both sides in the middle, with adjacent array elements having slots facing each other; Step 4: Replace the removed metal walls with several equally spaced metal pillars to ensure good impedance matching in the target frequency band and reduce the active reflection coefficient at the ports; Step 5: Replace the metal pillars with discrete ports.

The invention discloses an ultra-wideband multi-channel space power combiner, which comprises an input expansion coaxial structure, an output expansion coaxial structure, a connecting shaft, wedge-shaped trays, a balanced fin line PCB and a feed PCB, two ends of the connecting shaft are respectively connected with the input expansion coaxial structure and the output expansion coaxial structure, the plurality of wedge-shaped trays form a coaxial medium transmission line, and the balance fin line PCB is connected with the feed PCB. Two ends of the plurality of wedge-shaped trays are respectively connected with the input expansion coaxial structure and the output expansion coaxial structure, one side of each wedge-shaped tray is provided with an accommodating groove, the accommodating grooves are used for placing the balanced fin line PCB and the feed PCB, two ends of the balanced fin line PCB are respectively provided with a trapezoid matching structure, and the trapezoid matching structures are matched with the feed PCB. And the balanced fin line PCB is also symmetrically provided with a conical coupling groove, a groove line microstrip coupler and an impedance transformer, the impedance transformer is a broken line impedance transformer, the performance equivalent to that of an impedance transformer based on a cosine square function can be realized through the broken line impedance transformer, and the antenna has the advantages of small reflection coefficient and large bandwidth.

A broadband wide-angle electromagnetic wave absorption metasurface belongs to the field of radio frequency passive devices in the radio frequency technology, and is an electromagnetic wave absorption metasurface which is of a three-layer structure and sequentially comprises a top dielectric plate, a middle absorption metasurface layer and a lower dielectric plate from top to bottom. The absorption metasurface layer is formed by arranging and combining a plurality of metasurface units with the same structure; each metasurface unit is composed of a microstrip line, a chip resistor and a square chip with a metal branch knot. Due to the central symmetry characteristic of the absorber, the absorber has polarization insensitivity under normal incidence, namely, the absorber has the same absorption effect on x polarization and y polarization. The broadband large-angle electromagnetic wave absorption metasurface provided by the invention can realize broadband RCS reduction, is low in profile, easy to prepare and simple in design, and can effectively absorb incident waves at a large incident angle.

The invention provides a substrate integrated notch mirror image dielectric waveguide grid antenna, which belongs to the field of millimeter wave dielectric waveguides and antennae and comprises a dielectric radiator, metal signal columns, metal shielding columns, a first metal ground plane, a dielectric substrate and a second metal ground plane, and the first metal ground plane, the dielectric substrate and the second metal ground plane are arranged in a stacked manner. The lower surface of the dielectric radiator is tightly attached to the first metal ground plane, the upper surface of the dielectric radiator is not covered, the metal shielding columns penetrate through the dielectric substrate and are arranged on the periphery of the dielectric radiator in an array mode, the metal signal columns are embedded in the dielectric radiator, and the bottoms of the metal signal columns are connected to an input port in the first metal ground plane. An electromagnetic signal is fed into the antenna through the input port, is transmitted to the dielectric radiator through the metal signal column, and radiates electromagnetic energy outwards through the dielectric radiator, so that interference from an adjacent frequency band can be effectively inhibited, and the radiation efficiency of the antenna is improved.