Abstract: An ultra-wideband electromagnetic band gap (EBG) structure includes multiple EBG units in an array. Each EBG unit includes a power plane, a dielectric substrate and a ground plane from top to bottom. The power plane includes a patch, a coupled complementary split ring resonator (C-CSRR) and a plurality of semi-improved Z-bridge structures. Each edge of the patch is provided with a semi-improved Z-bridge structure. The C-CSRR is provided within a ring formed by the semi-improved Z-bridge structures. The Z-bridge structure includes a first horizontal branch, a first vertical branch, a second horizontal branch and a second vertical branch connected in sequence. The second vertical branch is connected to the patch. First horizontal branches of adjacent EBG units are connected to each other. A circuit board including the aforementioned EBG structure is also provided.

Abstract: A broadband fifth-generation (5G) circularly polarized filtering antenna includes a reflecting plate, a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, a fourth dielectric substrate, a feed line with a phase adjustment function print on one surface of the first dielectric substrate, a ground with a chair-like groove on an other surface of the first dielectric substrate, a first rectangular radiating unit, a second rectangular radiating unit, a first metal transmission strip group and a second metal transmission strip group.

Abstract: A broadband fifth-generation (5G) circularly polarized filtering antenna includes a reflecting plate, a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, a fourth dielectric substrate, a feed line with a phase adjustment function print on one surface of the first dielectric substrate, a ground with a chair-like groove on an other surface of the first dielectric substrate, a first rectangular radiating unit, a second rectangular radiating unit, a first metal transmission strip group and a second metal transmission strip group.

Abstract: Provided is a miniaturized ultra-low frequency antenna, including upper layer positive and negative electrodes, middle layer positive and negative electrodes and lower layer positive and negative electrodes, and a polyvinylidene fluoride column. The polyvinylidene fluoride column is respectively connected with the upper layer positive and negative electrodes, the middle layer positive and negative electrodes and the lower layer positive and negative electrodes. The polyvinylidene fluoride column is coated with stress electromagnetic conversion material layers. The upper layer positive and negative electrodes, the middle layer positive and negative electrodes and the lower layer positive and negative electrodes drive the polyvinylidene fluoride column to generate a deflection force through a voltage, and the stress electromagnetic conversion material layers are prompted to radiate electromagnetic waves and radiate under an action of the deflection force.

Abstract: Disclosed is a high-efficiency acoustic excitation low-frequency antenna driven by serial electrodes, including a plurality of electrode driving units for generating enhanced mechanical vibration waves based on voltage driving, a plurality of electrode isolation insulators positioned between every two electrode driving units to prevent short circuit between the electrode driving units, a mechanical-electromagnetic field conversion unit used for converting the enhanced mechanical vibration waves into enhanced electromagnetic field radiation and improving receiving sensitivity based on the enhanced electromagnetic field radiation, and electrode constraint structures used for constraining the electrode driving units so that the electrode driving units are located in the electrode constraint structures.

Abstract: Disclosed is a dual-band very low frequency antenna, which comprises positive and negative electrodes, silicon substrates, piezoelectric material units, stress-electromagnetic conversion material units and an insulator. The piezoelectric material units are arranged between the positive and negative electrodes; the stress-electromagnetic conversion material units and the silicon substrates are respectively arranged at both ends of the positive and negative electrodes. The positive and negative electrodes are used for driving the piezoelectric material units; the piezoelectric material units are used for generating flutter and conducting the flutter to the stress-electromagnetic conversion material units; the stress-electromagnetic conversion material units are used for converting vibration waves generated by flutter into electromagnetic wave radiation.

Abstract: Disclosed is a ceramic piezoelectric underwater detection and 5th generation (5G) mobile phone antenna, including: a ceramic cavity, a thin film, electrode feed holes and a coating, where the thin film is embedded inside the ceramic cavity; the electrode feed holes are drilled on both sides of the thin film at one end of a bottom of the ceramic cavity; the coating is coated outside the ceramic cavity for realizing omnidirectional radiation; the thin film drives the ceramic cavity to make the coating on an outer surface of the ceramic cavity generate radiation vibrations and generate electromagnetic wave radiation for communication and underwater detection.

Abstract: Disclosed is a dual-band very low frequency antenna, which comprises positive and negative electrodes, silicon substrates, piezoelectric material units, stress-electromagnetic conversion material units and an insulator. The piezoelectric material units are arranged between the positive and negative electrodes; the stress-electromagnetic conversion material units and the silicon substrates are respectively arranged at both ends of the positive and negative electrodes. The positive and negative electrodes are used for driving the piezoelectric material units; the piezoelectric material units are used for generating flutter and conducting the flutter to the stress-electromagnetic conversion material units; the stress-electromagnetic conversion material units are used for converting vibration waves generated by flutter into electromagnetic wave radiation.

Abstract: Disclosed is a multi-layer low-profile four-arm spiral antenna, including a metal grounding plate, and a top surface of the metal grounding plate is fixedly connected with three layers of cylindrical dielectric substrates; the three layers of dielectric substrates are coaxially arranged, and the three layers of dielectric substrates are coaxially arranged with the metal grounding plate, and a gap is set between two adjacent layers of dielectric substrates; four spiral metal strips with a same rotation direction are respectively arranged on each layer of dielectric substrate, the four spiral metal strips on each layer of dielectric substrate form spiral radial arms, and a phase difference of the four spiral metal strips on each layer of dielectric substrate is 90°; the corresponding spiral metal strips on the two adjacent layers of dielectric substrates are connected by connecting bridges, the connecting bridges are arranged in the gap.

Abstract: A magnetic liquid sealing device includes a housing, a rotating shaft, a first pole shoe, a second pole shoe, a plurality of permanent magnets, a rotation ring, and a sealing block. A chamber is defined in the housing including a first housing and a second housing. The rotating shaft passes through and is rotatable. The first pole shoe and the second pole shoe surround the rotating shaft and are spaced apart. The plurality of permanent magnets between the first pole shoe and the second pole shoe are spaced apart. The rotation ring surrounds the rotating shaft and is rotatable. The first housing, the rotation ring, and the second housing define the chamber. The rotation ring on outer sides of the plurality of permanent magnets is defined with a through hole running through the rotation ring. The sealing block in the through hole is detachably connected to the rotation ring.

Abstract: A magnetic liquid sealing device is provided. The magnetic liquid sealing device includes a housing, a rotating shaft, a pole shoe, a permanent magnet, and a first sealing ring. The rotating shaft is provided with an annular first stop portion, the pole shoe has a first end face and a second end face opposite to each other in an axial direction of the rotating shaft, and the permanent magnet is fitted over the rotating shaft. The first sealing ring is fitted over the rotating shaft, and includes a first part and a second part. The first part is sealedly fitted with at least one of the first end face and an inner peripheral surface of the housing, and an inner end of the second part is a first free end movably arranged along the axial direction of the rotating shaft.

Abstract: A magnetic liquid sealing device is provided. The magnetic liquid sealing device includes a housing, a rotating shaft, a pole shoe, a permanent magnet, and a first sealing ring. The rotating shaft is provided with an annular first stop portion, the pole shoe has a first end face and a second end face opposite to each other in an axial direction of the rotating shaft, and the permanent magnet is fitted over the rotating shaft. The first sealing ring is fitted over the rotating shaft, and includes a first part and a second part. The first part is sealedly fitted with at least one of the first end face and an inner peripheral surface of the housing, and an inner end of the second part is a first free end movably arranged along the axial direction of the rotating shaft.

Abstract: A magnetic liquid sealing device includes a housing, a rotating shaft, a first pole shoe, a second pole shoe, a plurality of permanent magnets, a rotation ring, and a sealing block. A chamber is defined in the housing including a first housing and a second housing. The rotating shaft passes through and is rotatable. The first pole shoe and the second pole shoe surround the rotating shaft and are spaced apart. The plurality of permanent magnets between the first pole shoe and the second pole shoe are spaced apart. The rotation ring surrounds the rotating shaft and is rotatable. The first housing, the rotation ring, and the second housing define the chamber. The rotation ring on outer sides of the plurality of permanent magnets is defined with a through hole running through the rotation ring. The sealing block in the through hole is detachably connected to the rotation ring.