53 results about "Electromagnetic bandgap" patented technology

Radiating elements comprise a first dipole radiator that includes a first dipole arm and a second dipole arm, a second dipole radiator that includes a third dipole arm and a fourth dipole arm and first through fourth electromagnetic bandgap structures that are coupled to distal end portions of the respective first through fourth dipole arms.

The embodiment of the invention relates to the technical field of communication, and discloses a radar antenna and an automobile intelligent driving system.The radar antenna comprises a substrate, an electromagnetic band gap structure layer, a ridge waveguide transmission structure and an antenna radiation layer, the electromagnetic band gap structure layer is provided with a pin unit, and the pin unit forms an electromagnetic shielding area; the ridge waveguide transmission structure is arranged in the electromagnetic band gap structure layer, one end of the ridge waveguide transmission structure is connected with a chip interface, the other end of the ridge waveguide transmission structure is connected with the antenna radiation layer, and the antenna radiation layer comprises a plurality of slot antennas arranged in the longitudinal direction and a plurality of choke groove assemblies. One choke groove assembly is adjacent to one slot antenna, and the electromagnetic band gap structure layer is connected with the antenna radiation layer to form a gap waveguide transmission channel. By means of the mode, electromagnetic connection between the layers can be achieved without a welding process, and the influence of welding quality difference on the antenna performance is avoided.

This invention discloses a gapped waveguide circularly polarized antenna for vehicle-mounted millimeter-wave radar, relating to the field of antenna technology. The antenna includes an upper metal structure and a PCB substrate stacked below. The metal structure integrates a radiating layer, a slotted layer, and a resonant cavity layer enclosed by an electromagnetic bandgap structure and metal walls. The signal is fed in through the PCB chip port, via an E-plane waveguide and an E-H waveguide conversion structure, and then into the resonant cavity. This invention, by employing a longitudinally slotted stacked -45° tilted slot radiating element design, or in conjunction with a parasitic slot structure, can equally excite two orthogonal fundamental modes and control the phase difference, thereby achieving broadband circularly polarized radiation. This antenna adopts a single-layer metal integrated design, featuring low profile, high gain, and wide axial ratio bandwidth, and is easy to fabricate and integrate. It is particularly suitable for high-performance vehicle-mounted MIMO radar systems, effectively solving the problems of high high-frequency dielectric loss and complex circular polarization implementation in existing technologies.

The application discloses a miniaturized multilayer electromagnetic bandgap structure. A dielectric substrate is arranged on a common ground plate, and three layers of metal structures, namely a first layer of spiral structure metal patch, a second layer of Z-shaped structure metal patch and a third layer of inverted Z-shaped structure metal patch, are sequentially embedded in the dielectric substrate from top to bottom. The first layer of spiral structure metal patch and the second layer of Z-shaped structure metal patch, the second layer of Z-shaped structure metal patch and the third layer of inverted Z-shaped structure metal patch, and the third layer of inverted Z-shaped structure metal patch and the common ground plate are electrically connected through metal through holes. The electromagnetic bandgap structure works at a lower frequency, can reduce electromagnetic radiation leakage between sputtering film and a PCB ground plane, and improves electromagnetic shielding effectiveness of a system-in-package.

This application relates to the field of electromagnetic bandgap structures and antenna decoupling technology, providing an integrated optimization design method and apparatus for EBG topology arrays. This invention constructs a joint integrated parent structure model, pre-setting multiple gaps as internal ports between discrete metal pixel patches in the EBG optimization region according to potential topological paths, establishing a discretized correlation between physical topology and electromagnetic response. The full-port impedance matrix is ​​condensed using the Schur complement algorithm. Simultaneously, the physical connectivity state of the internal ports is defined using binarized Boolean variables, and a mapping relationship between topology encoding and model S-parameters is established. This effectively equates the spatial electromagnetic topology contribution to an in-situ regulating load, enabling the genetic algorithm to perform performance evaluations in milliseconds during the evolutionary search process. This allows for the efficient synthesis of a non-uniform EBG connectivity topology with optimal decoupling performance without repeatedly calling full-wave simulation software.

The application discloses a multi-channel multi-beam double-face lead-out radio frequency micro module based on a DPC packaging substrate, comprising a multi-channel multi-beam radio frequency unit, a power management unit and a DPC packaging tube shell; a metal layer is arranged on the sidewall of the substrate of the DPC packaging tube shell, and the metal layer is jointly used with the ground metal layers on the upper and lower surfaces to form an electromagnetic shielding cavity; an electromagnetic bandgap structure is integrated on the upper surface of the substrate; and a resistance voltage division network and a power amplifier chip are connected to the lower substrate through a gold bump array flip-chip connection. Through the synergistic effect of the substrate sidewall metallization, the electromagnetic bandgap structure and the flip-chip connection of the chip, a multi-stage electromagnetic isolation barrier is constructed, the problems of signal leakage and insufficient isolation degree are solved, and the high-density integration and double-face lead-out function of the micro module are realized.

An array includes an electromagnetic bandgap structure having a dielectric substrate and multiple conductive patches on the dielectric substrate and for suppressing surface waves travelling across the conductive patches. The conductive patches include a first conductive patch and a second conductive patch spaced from, and electromagnetically coupled to, the first conductive patch. The second conductive patch is shaped as a polygon comprising at least three corners.

An array comprising an electromagnetic band gap structure, the electromagnetic band gap structure comprising a dielectric substrate and a plurality of conductive patches located on the dielectric substrate for suppressing surface waves propagating on the conductive patches. The conductive patches include a first conductive patch and a second conductive patch spaced apart from and electromagnetically coupled to the first conductive patch. The shape of the second conductive patch is a polygon comprising at least three corners.

The invention relates to a flexible noninvasive blood glucose sensing antenna integrated with an electromagnetic band gap and a double-split resonant ring, which adopts a flexible substrate and a coplanar waveguide feed network, and integrates an electromagnetic band gap array structure formed by periodic metal through holes on a ground plane; two symmetrically-distributed double-split resonant rings and parasitic branches for impedance matching are constructed at the top of the sensing antenna.

The invention relates to a circularly polarized wearable antenna loaded with an electromagnetic band gap reflecting surface, which comprises two pairs of bent line structure dipoles which are arranged on the upper surface and the lower surface of an upper PDMS flexible substrate and are orthogonally arranged, and coaxial lines with 50 ohm impedance are respectively connected with the orthogonal centers of the two pairs of dipoles, so that antenna center feeding is realized, and a crossed dipole antenna is formed; the phase delay rings are connected to form a 90-degree phase difference, so that the antenna circular polarization characteristic of a required frequency band is realized; the electromagnetic band gap reflecting surface is composed of a PDMS flexible substrate at the lower layer, bent line annular patches printed on the PDMS flexible substrate and arranged in an array and a grounding surface at the bottommost layer, and each bent line annular patch serves as a reflecting surface unit, so that the effective inductance of the electromagnetic band gap reflecting surface is increased, and the working bandwidth of the electromagnetic band gap reflecting surface is widened; and the electromagnetic band gap reflecting surface is placed at a position 1-13mm below the crossed dipole antenna so as to carry out impedance matching. The antenna is less affected by human body coupling, can be stably applied to the wearable field, and has the advantages of flexibility, broadband, high gain, low profile and low specific absorption rate.

The application relates to a dual-frequency dual-polarized millimeter wave array antenna with wide-angle scanning capability and an electronic device with the same. The millimeter wave array antenna comprises, from top to bottom and sequentially stacked and separated from each other: a high-frequency radiation layer comprising a plurality of high-frequency radiation units arranged periodically, the high-frequency radiation units being dual-polarized radiation units with a first working frequency band; a low-frequency radiation layer comprising a plurality of low-frequency radiation units arranged periodically, the low-frequency radiation units being dual-polarized radiation units with a second working frequency band, the second working frequency band being non-overlapping with the first working frequency band, and the second working frequency band being lower than the first working frequency band; and an electromagnetic bandgap layer having a third working frequency band and a fourth working frequency band which are non-overlapping with each other, the fourth working frequency band being lower than the third working frequency band, the third working frequency band corresponding to the first working frequency band, and the fourth working frequency band corresponding to the second working frequency band.

This invention discloses a millimeter-wave ultra-wideband gapped waveguide mechanical synchronous phase-shifting feed device with anisotropic pulse width modulation, belonging to the field of microwave and millimeter-wave antenna technology. The device includes a stacked top cover plate, an intermediate layer, a fixed base plate, and a movable base plate. Fixed and movable pins are arranged alternately to form four rectangular waveguide channels. When the movable base plate is translated, the width of the first channel decreases to achieve phase lead, while the width of the remaining channels increases to achieve phase delay, forming anisotropic pulse width modulation offset to counteract nonlinear phase disturbances. The intermediate layer integrates stepped transitions, cross-shaped transition ridges, and oblique ridge waveguides to achieve cross-layer broadband coupling and path compensation. The power divider is loaded with capacitive grooves and inductive steps, and the second stage uses asymmetric steps and tuning pillars to achieve tapered distribution. An electromagnetic bandgap structure is provided at the gap to suppress leakage. This invention achieves compact, low-error multi-channel synchronous phase shifting in the 32-42 GHz frequency band.

The application discloses an electromagnetic bandgap structure and a circuit board, and is applied to the field of high-frequency circuits.The electromagnetic bandgap structure comprises a center part, a signal connecting line connected with the center part and extending away from the center part, and metal wires located at the periphery of the center part, the metal wires being spaced apart from the signal connecting line, both ends of the metal wires being connected with the center part, and a shielding groove being formed between the metal wires and the center part.The electromagnetic bandgap structure provided by the application increases the noise suppression cutoff frequency depth, can effectively suppress the ground bounce effect of a power layer, and further reduces the effect of the ground bounce effect on signal quality and electromagnetic radiation; the shielding groove can avoid the diffusion of a signal interference source, so as to ensure the integrity of signal transmission.

The invention discloses a single-layer gap waveguide antenna covering a full frequency band. The antenna comprises a substrate, and the substrate is provided with a PCB port-waveguide port conversion structure and a plurality of radiation antennas. The conversion structure comprises a 0-degree PCB port-waveguide port, a 90-degree PCB port-waveguide port and a central PCB port-waveguide port; the radiation antenna comprises a plurality of antenna metal columns, an antenna waveguide ridge, a plurality of rectangular radiation openings and a plurality of electromagnetic band gap structures. The antenna metal columns are used for suppressing leaky waves and adjusting offset and impedance. The antenna waveguide ridge is used for reducing the cut-off frequency of the gap waveguide feeder; the plurality of rectangular radiation openings are used for enhancing radiation through resonance and adjusting radiation amplitude and sidelobe level; the plurality of electromagnetic band gap structures are arranged around the plurality of rectangular radiation openings and are used for improving isolation and beam shaping between adjacent antennas. According to the invention, 76-81GHz continuous coverage is realized on the premise of not increasing laminations, the in-band main lobe is stable, and the side lobe is low.

An onboard / microstrip antenna (502) comprises a radiator (504) for transmitting and receiving wireless signals. Truncations are present on at least one pair of diagonally opposite comers of the radiator to generate circular polarization. A ground plane (602) is positioned beneath the radiator (602) to reflect wireless signals. A plurality of dielectric substrates (604) is sandwiched between the radiator (504) and the ground plane (602) to facilitate impedance matching. Further, a feed line (506) is coupled to the radiator (504) to enable signal transmission between the radiator (504) and one or more wireless communication modules. Further, a plurality of V-shaped slots is integrated symmetrically along the edges of the radiator (504) to reduce the form factor of the antenna. The microstrip antenna (502) integrates an Electromagnetic Bandgap (EBG) structure with ground vias to mitigate signal interference and enhance radiation efficiency.

This invention discloses a millimeter-wave high-amplitude and phase-coherent single-pulse sum-difference network, belonging to the field of single-pulse radar. The sum-difference network is a symmetrical planar structure, including two first-order planar magic-Ts, two second-order planar magic-Ts, two 90° twisted waveguides, four 90° waveguide turning structures, and an electromagnetic bandgap structure disposed around the network. The first-order and second-order planar magic-Ts are identical planar magic-Ts, composed of an H-plane power divider and an E-plane waveguide. The electromagnetic bandgap structure includes an interleaved slot electromagnetic bandgap structure and a metal pillar electromagnetic bandgap structure. This invention employs an integrated planar structure, requiring only one-time processing and assembly, significantly reducing processing and assembly errors. Simultaneously, the planar magic-Ts are designed to effectively avoid the inherent dispersion defects of bridges and phase shifters, achieving high amplitude and phase coherence over a wide bandwidth. Furthermore, the use of a hybrid electromagnetic bandgap structure reduces the fabrication difficulty of the device while preventing electromagnetic leakage.

The invention discloses a circularly polarized filtering grid slotted patch antenna based on a substrate integrated gap waveguide. The antenna adopts a multi-layer stacked structure and comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate and a fourth dielectric substrate which are arranged from top to bottom and bonding layers among the first dielectric substrate and the fourth dielectric substrate, four corner cut square patches are arranged on the upper surface of the first dielectric substrate, and two corner cut rectangular patches are arranged on the lower surface of the first dielectric substrate; the upper surface of the second dielectric substrate is provided with a cross strip and four parasitic strips, and the lower surface of the second dielectric substrate is provided with a circular ring; a rectangular metal patch with a gap is arranged on the upper surface of the third dielectric substrate, and a forked microstrip feed structure and two folding strips are arranged on the lower surface of the third dielectric substrate; the upper surface of the fourth dielectric substrate is provided with a circular metal patch array, the lower surface of the fourth dielectric substrate is provided with a rectangular metal patch as large as the fourth dielectric, and the upper surface and the lower surface of the fourth dielectric substrate are connected through a metal column to jointly form an electromagnetic band gap structure. The invention has excellent upper stop band suppression capability.

The application relates to the technical field of semiconductor structures, in particular to a three-dimensional electromagnetic bandgap structure based on a through silicon via and an array system, which comprises a dielectric substrate, upper and lower surface metal layers and a via array; the metal layers are provided with central interdigital electrodes for generating planar distributed capacitances and edge comb electrodes for realizing electromagnetic coupling, and the vias connect the upper and lower interdigital electrodes to form a three-dimensional resonant loop; the array system realizes non-contact staggered engagement of the edge comb electrodes of adjacent units, forms distributed field interaction in the staggered area and excites a coupled resonant mode; through superposition of an intrinsic mode and a coupled mode in a frequency domain, a continuous wideband noise suppression stopband is formed, and the electromagnetic compatibility of a three-dimensional integrated circuit is significantly improved.

The application provides a radar package antenna layout structure and a millimeter wave radar, comprising: a package antenna substrate; a multiple-input multiple-output (MIMO) antenna array arranged on a top layer of the package antenna substrate, the MIMO antenna array comprising a transmitting antenna array and a receiving antenna array; a metal isolation strip arranged between the transmitting antenna array and the receiving antenna array; and an electromagnetic bandgap structure array group arranged between transmitting antenna units in the transmitting antenna array, each electromagnetic bandgap structure array in the electromagnetic bandgap structure array group comprising a plurality of electromagnetic bandgap structure units, and a short side of each electromagnetic bandgap structure unit being arranged perpendicularly to an electric field radiation plane of the transmitting antenna unit. The application solves the problem of a decrease in isolation caused by a compact layout.

This invention discloses a single-tooth electromagnetic bandgap resonant cavity for testing dielectric properties in the thickness direction, belonging to the technical field of dielectric property testing for microwave and millimeter-wave materials. The single-tooth electromagnetic bandgap resonant cavity constructed by this method uses the TE test mode. 10n The electric field direction within the cavity is perpendicular to the material thickness direction, enabling the testing of dielectric properties along the Z-axis. This cavity allows for multi-frequency testing, meeting testing requirements within the 2.5GHz to 110GHz frequency range. With a quality factor greater than 3000, it offers higher testing accuracy when measuring dielectric loss. Compared to a double-tooth electromagnetic bandgap resonant cavity, a single-tooth electromagnetic bandgap resonant cavity is simpler, solving the positioning difficulties caused by the need for strict symmetry in the electromagnetic bandgap structure between the two half-cavities, while also reducing manufacturing costs. Furthermore, one side of the single-tooth electromagnetic bandgap resonant cavity is a smooth metal plate, making sample insertion through the gap more convenient.

The application provides a microstrip antenna structure, a design method and a millimeter wave radar. The microstrip antenna structure comprises an antenna main body, the antenna main body comprises a top copper sheet, a dielectric substrate and a bottom copper sheet, at least two groups of comb-shaped antennas and a group of electromagnetic bandgap structures between each two adjacent groups of comb-shaped antennas are formed on the top copper sheet through etching. The electromagnetic bandgap structure comprises a plurality of interconnected electromagnetic bandgap units, the opening directions of two adjacent electromagnetic bandgap units are opposite, a previous electromagnetic bandgap unit is conformally designed with a radiation sheet on one side of a first group of comb-shaped antennas, and a subsequent electromagnetic bandgap unit is conformally designed with a radiation sheet on the other side of a second group of comb-shaped antennas, so as to produce a wave-limiting function on adjacent and conformally designed radiation sheets. The application does not need to increase the size of a circuit board, can realize the bandgap characteristic by only changing the structure or distribution of the EBG, saves space and is flexible in application.

The utility model relates to the technical field of electric energy control of a photovoltaic grid-connected inverter, in particular to a photovoltaic grid-connected inverter harmonic wave and voltage fluctuation self-adaptive adjusting circuit, which comprises a harmonic wave sensing module, a digital processing module, a dynamic filtering module and a voltage compensation module. The harmonic sensing module obtains harmonic information through the low-frequency-intermediate-frequency-high-frequency series mutual inductor, and the digital processing module analyzes the harmonic information in real time and outputs a dispatching instruction. The dynamic filtering module performs millisecond-level switching among four groups of filtering channels through a magnetic latching relay and a field-effect tube array, so as to realize on-demand input of fifth harmonic wave trapping, high-frequency pi-type filtering, damping filtering and negative sequence compensation; the voltage compensation module injects compensation voltage through a three-phase IGBT bridge arm, and the output end suppresses residual high-frequency interference through an electromagnetic band gap filter and a ferrite magnetic ring. According to the scheme, harmonic detection, filtering reconstruction and voltage stabilization are integrated in the same hardware, and the problems of frequency band blind areas, response lag and high voltage fluctuation compensation cost are solved.

The invention provides a multifunctional passive device integrating an antenna array and a multi-channel filter, which belongs to the technical field of millimeter wave communication antennas and comprises a metal substrate, a high-frequency antenna array feed port and a low-frequency filter feed port, a pyramid horn array, a first vertical waveguide section, a cavity layer, a second vertical waveguide section and an H-shaped waveguide power dividing feed network are sequentially arranged in the metal base body from top to bottom. The low-frequency filter port is connected to the cavity layer, and the high-frequency antenna array feed port is arranged at the input port of the H-shaped waveguide power division feed network. According to the invention, integration of multiple filtering channels is realized, and the integration level and the structure multiplexing rate of a multifunctional device are improved; the antenna and the filter are integrated by means of the frequency selection characteristic of the electromagnetic band gap structure, the natural high isolation characteristic between the antenna and the filter is provided, an additional isolation structure is prevented from being added, and the design complexity is reduced.

The application relates to the technical field of electromagnetic bandgap structures and antenna decoupling, and provides an EBG topology array level integrated optimization design method and device.The application constructs a joint integrated mother structure model, multiple gaps are preset as internal ports according to potential topology paths among discrete metal pixel patches in an EBG to-be-optimized area, and the discretization association between physical topology and electromagnetic response is established.The whole-port impedance matrix is condensed through a Schur complement algorithm, meanwhile, the physical connection state of the internal ports is defined by binary Boolean variables, and the mapping relationship between topology coding and model S parameters is established, so that the spatial electromagnetic topology contribution is equivalent to in-situ load adjustment, the single performance evaluation only needs millisecond-level operation in the genetic algorithm evolution search process, and the non-uniform EBG connection topology with optimal decoupling performance is efficiently synthesized under the premise of not repeatedly calling a full-wave simulation software.

An antenna device includes a board including a conductor layer, a first conductor pattern arranged on a surface of the board, a connecting section that connects the first conductor pattern to the conductor layer, a second conductor pattern that has one end side connected to one end side of the first conductor pattern and has a length which is equal to or longer than approximately ¼ of an operating wavelength, multiple first electromagnetic bandgap elements arranged on both sides of the first conductor pattern in a longitudinal direction on the board, multiple second electromagnetic bandgap elements arranged on both sides of the second conductor pattern in a longitudinal direction on the board, a conductor plate that faces the first conductor pattern, and a third conductor pattern that has one end side connected to another end side of the second conductor pattern and is arranged on the surface of the board.

The embodiment of the invention discloses a loudspeaker module. The loudspeaker module comprises a shell assembly, a loudspeaker monomer and an electromagnetic band gap structural member, wherein the shell assembly is internally provided with a cavity, the shell assembly is provided with an antenna, the loudspeaker single body is arranged in the cavity, and the electromagnetic band gap structural member is located between the antenna and the loudspeaker single body. Therefore, the loudspeaker module realizes the integration of the loudspeaker monomer and the antenna, and meanwhile, the arrangement of the electromagnetic band gap structural member is beneficial to improving the antenna performance.

In an embodiment, a 3D-printed electrical structure such as an electromagnetic bandgap is provided. The structure includes a dielectric material with an embedded electrical interconnect that functions like a via and electrically connects a first surface of the dielectric material with a second surface of the dielectric material such as a ground plane. Unlike conventional vias, the embedded interconnect is not limited to straight lines and can take a variety of shapes and paths in the dielectric material allowing for the electrical interconnect to have a longer length than the thickness of the dielectric material. Increasing the length of the electrical interconnect increases the inductance of the electrical interconnect which in turn increases the bandwidth and reduces the frequency of the electrical structure without an increase in the height of the dielectric material.

The invention belongs to the technical field of antennas, and particularly relates to a broadband and wide-angle scanning dual-circularly-polarized circular waveguide antenna array. The unit of the antenna array comprises a feed port, an impedance matching structure, a circular polarizer, a metal waveguide wall and a dielectric material filled in the waveguide. The two feed ports correspond to left-hand circular polarization and right-hand circular polarization; the circular polarizer converts linearly polarized electromagnetic waves from a port into two electromagnetic waves which are vertical in direction, equal in amplitude and 90-degree in phase difference, and the two electromagnetic waves are synthesized into circularly polarized electromagnetic waves; a conical dielectric material is loaded at the junction of the dielectric material and an air interface, and smooth impedance conversion from waveguide aperture impedance to free space impedance is provided; and the metal waveguide wall is provided with a conical electromagnetic band gap structure at the waveguide opening. When the antenna works, a signal of a port is changed into a circularly polarized signal after passing through the impedance matching section and the circular polarizer, the circularly polarized signal is radiated out at the waveguide opening, and the array can realize broadband and wide-angle scanning due to the integration of the impedance gradual change structure and the electromagnetic band gap structure.

The invention belongs to the technical field of electric vacuum, and particularly relates to a medium-loaded miniaturized high-voltage-withstanding non-uniform electromagnetic band gap structure which comprises a vacuum rectangular over-mode waveguide, a metal shell and an electromagnetic band gap structure body. The vacuum rectangular over-mode waveguide penetrates through the metal shell and the electromagnetic band gap structure body; the electromagnetic band gap structure body is fixedly packaged in the metal shell and is made of a high-dielectric-constant material, and a plurality of concentric annular grooves serving as medium loading choke grooves are formed in the two end faces of the electromagnetic band gap structure body so as to form an electromagnetic band gap surface; a cuboid ridge is arranged on each end face of the electromagnetic band gap structure body and located between the innermost ring of annular groove and the two long sides of the vacuum rectangular over-mode waveguide. Through the synergistic effect of the structures, the structure size is smaller, the withstand voltage is higher, the design size is smaller, the weight is lighter, the withstand voltage is higher, and the like.

The application discloses a miniaturized broadband SIW filter for satellite communication. The SIW structure is adopted as a design basis, and the quarter-mode substrate integrated waveguide and the composite left-hand / right-hand structure are adopted to realize miniaturization of the radio frequency filter. In addition, the electromagnetic bandgap structure is adopted to realize strong suppression effect, high selection characteristic and wideband characteristic on the stop band. Main modules of the filter include a feed port of an electromagnetic bandgap (EBG) structure, a SIW resonant cavity, an inductive coupling window module and a CRLH structure. A tapered line is adopted for impedance matching of input / output ports, and in addition, a gap structure is etched on the input / output ports to realize EBG loading. The QMSIW cavity part is cut according to the symmetry of electromagnetic wave distribution, and the volume of the QMSIW is reduced to one fourth of the whole SIW structure. The CRLH structure loading is realized by using the interdigital structure, and the EBG structure is loaded on the interdigital metal.