Method for implementing frequency hopping synchronization for orthogonal frequency division multiplex

Multiband ultra-wideband antenna

The invention relates to a multiband ultra-wideband antenna and belongs to the field of an antenna technology. The multiband ultra-wideband antenna comprises a radiator, a ground plate and a center-feeding point. The radiator contains a first radiating element (2), a second radiating element (2) and a third radiating element (5) which are respectively corresponding to GPS L1, WLAN and UWB bands of the antenna. By additionally arranging an L-shaped slit (6) in the radiator and a third slit (8) in the ground plate (11), internal impedance characteristic of ultra-wideband frequency domain is improved. The multiband ultra-wideband antenna has a simple structure, has stable performance and is easy to integrate with a mobile terminal. Operating frequency of the multiband ultra-wideband antenna includes GPS L1(1.575GHz), WLAN(2.4GHz) and ultra-wideband UWB(3.1-10.6GHz).

Double-frequency microstrip antenna

The invention discloses a double-frequency microstrip antenna, which comprises an upper-layer microstrip antenna with an upper-layer paster, a lower- layer of microstrip antenna with a lower-layer paster and a feed network located at the bottom layer. The geometric center of the upper-layer paster is provided with an upper-layer central hole, the geometric center of the lower-layer paster is provided with a lower-layer central hole, the double-frequency microstrip antenna is also provided with a short circuit pin which is connected with an earth wire of the feed network after sequentially penetrating into the upper-layer microstrip antenna from the upper-layer central hole and penetrating into the lower-layer microstrip antenna from the lower-layer central hole, and the short circuit pin is respectively electrically connected with the upper-layer paster and the lower-layer paster. In the invention, through fixing the geometric center of the upper-layer paster and the geometric center of ...

Low-profile high-isolation polarization diversity patch antenna and wireless communication equipment

The invention discloses a low-profile high-isolation polarization diversity patch antenna and wireless communication equipment. The antenna comprises a first layer, a second layer and two coaxial cable ports, the first layer comprises a first dielectric plate, a radiation patch and a hook-shaped microstrip balun, the hook-shaped microstrip balun is arranged at the top of the first dielectric plate, and the radiation patch is arranged at the bottom of the first dielectric plate; the second layer comprises a second dielectric plate, a metal reflecting plate and a microstrip line, the metal reflecting plate is arranged at the top of the second dielectric plate, and the microstrip line is arranged at the bottom of the second dielectric plate; the two coaxial cable ports are respectively a first coaxial cable port and a second coaxial cable port, the first coaxial cable port feeds through the hook-shaped microstrip balun, and the second coaxial cable port feeds through microstrip line coupling ...

Dual-broadband dual-polarization magnetoelectric dipole base station antenna and communication equipment

The invention discloses a dual-broadband dual-polarization magnetoelectric dipole base station antenna and communication equipment, the antenna comprises a first layer, a second layer, a third layer, a vertical layer, a metal baffle plate, a metal reflection layer and a feed structure, and the metal baffle plate is arranged around the metal reflection layer; the first layer comprises a parasitic patch and a first dielectric plate, and the parasitic patch is arranged on the upper surface of the first dielectric plate; the second layer comprises octagonal radiation patches and a second dielectric plate, and the octagonal radiation patches are symmetrically arranged on the upper surface of the second dielectric plate to form two pairs of electric dipoles; the third layer comprises rectangular radiation patches and a third dielectric plate, and the rectangular radiation patches are symmetrically arranged on the upper surface of the third dielectric plate to form two pairs of electric dipoles ...

Broadband circularly polarized dipole antenna and wireless communication equipment

The invention discloses a broadband circularly polarized dipole antenna and wireless communication equipment, the antenna comprises a radiator, a first dielectric plate, a second dielectric plate, a third dielectric plate, a feed balun and a metal floor, the second dielectric plate is vertically arranged between the first dielectric plate and the third dielectric plate, the radiator is arranged on the upper surface of the first dielectric plate, and the feed balun is arranged on the upper surface of the second dielectric plate. The metal floor is arranged on the upper surface of the third dielectric plate, and the feed balun is arranged on the second dielectric plate and connected with the radiator and the metal floor. The radiator comprises a first branch knot, a first radiation arm, a second branch knot, a third branch knot, a second radiation arm and a fourth branch knot, the first branch knot, the first radiation arm and the second branch knot are sequentially connected to form a first ...

Artificial electromagnetic medium based broadband multi-mode satellite navigation antenna

The invention relates to an artificial electromagnetic medium based broadband multi-mode satellite navigation antenna. The port impedance characteristic has the operational capability of a 1.26GHz to 1.73GHz broadband, the circular polarization working frequency band can cover a plurality of frequency points of GPS, Beidou, GLONASS and Galileo, the antenna is provided with an upper layer artificial electromagnetic medium covering layer and a lower layer antenna substrate layer, the upper layer artificial electromagnetic medium covering layer is formed by a reactive impedance surface which is formed by small patch arrays, two planar spiral lines are formed in the upper surface of the lower layer antenna substrate in a hollow-out mode through copper foil, segmented microstrip lines are arranged on the lower surface of the lower layer antenna substrate to be served as feeder lines, and plastic screws and nuts are arranged between the upper layer antenna electromagnetic medium covering layer ...

Circularly-polarized symmetrical parasitic RFID antenna system

The invention discloses a circularly-polarized symmetrical parasitic RFID antenna system. The circularly-polarized symmetrical parasitic RFID antenna system comprises an antenna part, a parasitic part, a PCB body, a baseband circuit, a radio frequency circuit and a power circuit, wherein the baseband circuit, the radio frequency circuit and the power circuit are arranged on the PCB body. The upper surface of the PCB body is provided with a conductive metal layer used as both an antenna ground and a circuit ground. The antenna part is arranged on the upper surface of the conductive metal layer and electrically connected with a radio frequency output port of the radio frequency circuit. The parasitic part is arranged on the upper surface of the conductive metal layer and electrically connected with the conductive metal layer. The baseband circuit, the radio frequency circuit and the power circuit are arranged on the lower surface of the PCB body. The upper surface of the PCB body is provided ...

Narrow-spacing low-SAR high-isolation MIMO antenna

The invention discloses a narrow-spacing low-SAR high-isolation MIMO antenna. The narrow-spacing low-SAR high-isolation MIMO antenna comprises a PCB and two antenna bodies used for supporting different service signals, wherein the two antenna bodies are distributed on the two sides of the top end of the PCB and respectively provided with feeding points, the antenna bodies are connected to the PCB through the feeding points respectively, and the feeding points of the two antenna bodies are asymmetrically distributed. According to the antenna, the feeding positions are arranged in the asymmetrical positions on the same side of the PCB, it is avoided that the feeding positions of the antenna are located in the symmetrical current resonance positions, and the isolation degree between the antennas is improved.

Omnidirectional dual-circularly-polarized helical antenna and communication equipment

The invention discloses an omnidirectional dual-circularly-polarized helical antenna and communication equipment, and the antenna comprises a first omnidirectional circularly-polarized unit and a second omnidirectional circularly-polarized unit, and the first omnidirectional circularly-polarized unit and the second omnidirectional circularly-polarized unit are respectively used for radiating a left-hand circularly-polarized wave and a right-hand circularly-polarized wave. The first omnidirectional circular polarization unit and the second omnidirectional circular polarization unit are respectively provided with a feed port, the straight conductor of the first omnidirectional circular polarization unit is nested by one spiral conductor of the second omnidirectional circular polarization unit, and the straight conductor of the second omnidirectional circular polarization unit is nested by one spiral conductor of the first omnidirectional circular polarization unit. The antenna comprises the ...

Distribution network fault detection system

The invention discloses a distribution network fault detection system, which comprises a fault detector and a centralized processor, wherein the fault detector comprises a current transformer, a signal processing circuit, a low pass filter, a frequency detection circuit, a band pass filter, a first microprocessor and a first communication module; and the centralized processor comprises a second communication module and a second microprocessor. The distribution network fault detection system can intelligently detect the distribution network faults, is accurate in positioning, ensures stable and reliable work of a distribution network, and has low power consumption and strong interference resistance.

Distribution network fault detection system

Ultra-wideband dual circularly polarized antenna and wireless communication equipment

The invention discloses an ultra wide band dual circularly polarized antenna and wireless communication equipment, the antenna comprises a radiator, a feed structure, a metal floor and a dielectric plate, the radiator is arranged on the upper surface of the dielectric plate, the radiator comprises a first L-shaped radiation patch and a second L-shaped radiation patch, and the first L-shaped radiation patch and the second L-shaped radiation patch are arranged on the upper surface of the dielectric plate. The feed structure comprises a first excitation port and a second excitation port, and the metal floor is arranged on the lower surface of the dielectric plate; the first L-shaped radiation patch and the second L-shaped radiation patch as well as the first excitation port and the second excitation port are respectively symmetrical about the diagonal line of the dielectric plate, and the metal floor is of a structure symmetrical about the diagonal line of the dielectric plate; the first L-shaped ...