15 results about "Electrically small antenna" patented technology

The low-frequency electromagnetic wave has the characteristics of high penetrability and low signal attenuation, and can be widely applied to the fields of underground communication, underwater communication and the like. Most existing low-frequency transmitting antennas are electrically small antennas, have the problems of large size, complex equipment, short transmission distance and the like, and are difficult to meet actual requirements. The invention relates to a high-power pulse low-frequency antenna based on a Tesla coil. The high-power pulse low-frequency antenna is a high-power pulse transmitting antenna composed of a solid-state double-resonance Tesla circuit, a transformer, a primary coil and a secondary coil. The antenna adopts a high-voltage pulse generated by a Tesla circuit for feeding, and meanwhile, a transformer type impedance matching network is combined, so that the feed power is maximized. The radiation coil selects a primary and secondary nested coupling structure, the working frequency is accurately adjusted to be the output frequency of the Tesla circuit by respectively connecting resonant capacitors in series to the primary and secondary coils, and effective amplification of radiation signals is realized based on a magnetic coupling effect. The size of the coil is in the sub-cubic meter level and is within one thousandth of the working wavelength. Aiming at the antenna design difficulty in long-wave communication, the antenna has the advantages of high input power, long-distance transmission and small physical size, and has potential application value in the fields of cross-medium communication, emergency management communication and the like.

The invention discloses an ultra-wideband transient multi-electromagnetic physical quantity synchronous measurement method and system, and the method comprises the steps: designing an electric field sensor based on a monopole rod-shaped electrically small antenna principle, and designing a magnetic field sensor based on a Faraday's law of electromagnetic induction; designing a voltage sensor based on a self-integration mode, and designing a current sensor based on a broadband Rogowski coil; based on a digital sampling technology of an FPGA, a digital processor is designed, sampling data collected by an electric field sensor, a magnetic field sensor, a voltage sensor and a current sensor are collected through the digital processor, the sampling data are transmitted to an upper computer through a QSFP module, and the sampling data are processed and displayed through the upper computer. The scheme can be effectively applied to application scenes of transient electromagnetic environment online monitoring, fault diagnosis, radiation source accurate positioning and the like of high-voltage power equipment.

An electrically small antenna system modulates the Q factor of the antenna during electrical transmission to decrease the Q factor during signal transitions between frequency states thereby affecting an improved trade-off between antenna bandwidth and operating efficiency.

An antenna assembly performs a method for operating an electrically small antenna (ESA). The antenna assembly includes a drive circuit for operating the ESA. The drive circuit includes a resonator having a first resonant frequency, a variable coupling element that controls an electrical connection between the drive circuit and the ESA, a first modulator that modulates the variable coupling element at a first tonal frequency, and a second modulator configured to modulate the variable coupling element at a second tonal frequency. The first tonal frequency is a sum of the first resonant frequency and a second resonant frequency of the ESA. The second tonal frequency is a difference between the first resonant frequency and the second resonant frequency.

The embodiment of the invention discloses an electrically small antenna and terminal equipment, and belongs to the technical field of communication. The electrically small antenna comprises a radiator, a grounding pole and a grounding plate, wherein the radiator is connected with the grounding plate through the grounding pole; the radiating body comprises a first radiating body and a second radiating body which are connected with each other, a connecting point of the first radiating body and the second radiating body is connected with the grounding pole, a first end of the first radiating body, a first end of the second radiating body and a first end of the grounding pole are connected together to form a grounding end of the radiating body, and a second end of the first radiating body is a feed end of the radiating body. The second end of the second radiator is an open circuit end of the radiator. Compared with the scheme for improving the beam width of the antenna in the related technology, the embodiment of the invention not only can improve the beam width of the antenna, but also can reduce the occupied space.

The present disclosure relates to a hybrid quantum sensor and method for detecting electromagnetic signals using the unique properties of Rydberg atoms and electrically small apertures. The sensor comprises an electrically small antenna that is non-resonant at a detection frequency that generates a concentrated electric field within a defined volume.

An example antenna assembly includes an electrically small antenna having at least two sectors, wherein the at least two sectors are coupled to operate in at least a first mode and a second mode, the first mode is a radiative mode having a resonance, and the second mode is a non-radiative mode. The antenna assembly includes at least one time-varying reactive component having a parametric modulation frequency configured to at least partially couple the resonance of the radiative mode to the resonance of the non-radiative mode at a negative frequency, wherein the parametric modulation frequency of the at least one time-varying reactive component is greater than or less than a frequency value which exactly couples the resonance of the radiative mode to the negative frequency of the non-radiative mode.

This invention relates to the field of antenna technology and provides a wide-bandwidth beam circularly polarized communication antenna, comprising a first radiator group (100) and a second radiator group (200). The first and second radiator groups have identical structures and are arranged in a spatially rotated 180-degree arrangement. The first radiator group (100) contains four structurally identical radiator elements (001, 002, 003, 004), and adjacent elements form a radiator pair (010, 020). The surface currents of the two radiator elements within each radiator pair are in phase to enhance radiation. The current phases of adjacent radiator pairs differ by 90 degrees, and the current phases of the two radiator groups differ by 180 degrees to achieve circularly polarized radiation. A pair of parallel metal strips (1) are connected between the two radiator groups to modulate impedance. The antenna of this invention is close to the size of an electrically small antenna, but achieves an impedance bandwidth of 11.18%, and a 3dB beamwidth that reaches 160 degrees in different cross sections and is uniform and stable, showing great potential for application in indoor communication and satellite navigation.

A matching technique for receivers with ESA so that the receiver can achieve low noise performance over a broad bandwidth. An electrically small dipole is matched directly to a parametric amplifier, without using any inductors. The parametric amplifier operates in a time-varying fashion, driven by a higher RF frequency pump, and exhibits a high impedance, time-varying capacitive load to the ESA. Therefore, the low frequency voltage output from the ESA is detected at the input of the parametric amplifier, being amplified and upconverted to the proximity of the pump frequency at the output with minimum contamination of noise in this process.

An antenna assembly performs a method for operating an electrically small antenna (ESA). The antenna assembly includes a drive circuit for operating the ESA. The drive circuit includes a resonator having a first resonant frequency, a variable coupling element that controls an electrical connection between the drive circuit and the ESA, a first modulator that modulates the variable coupling element at a first tonal frequency, and a second modulator configured to modulate the variable coupling element at a second tonal frequency. The first tonal frequency is a sum of the first resonant frequency and a second resonant frequency of the ESA. The second tonal frequency is a difference between the first resonant frequency and the second resonant frequency.

The invention discloses a Minkowski fractal-like dual-polarized electrically small antenna and an array thereof. The dual-polarized electrically small antenna comprises a covering dielectric substrate (1-1), a bonding sheet (1-2), an antenna dielectric substrate (1-3) and a metal ground (1-4) from top to bottom in sequence, the first radiation patch (2-1) is positioned between the antenna dielectric substrate and the covering dielectric substrate and is embedded in the bonding sheet; the metal through holes (3-1) are distributed on the periphery of the dual-polarization electrically small antenna, and the two metal feed through holes (4-1) are symmetrically distributed on the two sides of the central axis of the plane of the antenna dielectric substrate. The antenna array is composed of two antenna units which are arranged in a left-right mirror symmetry mode, and a neutral line and a defected ground structure are introduced into a grounding metal plate to restrain coupling between array elements. The working frequency range of the antenna covers 12.7-13.25 GHz, the plane size is 0.16 * 0.16 lambda < 2 >, the gain is greater than 2dBi, and a miniaturized mobile terminal antenna scheme which is high in performance, low in cost and easy to integrate is provided for 5G wireless communication.

The invention relates to the technical field of antennas, and provides a broadband wide-beam circularly polarized communication antenna, which comprises a first radiator group (100) and a second radiator group (200), the first radiator group (100) and the second radiator group (200) have the same structure and are arranged by rotating 180 degrees in space, the first radiator group (100) comprises four radiator units (001, 002, 003, 004) with the same structure, and the second radiator group (200) comprises four radiator units (001, 002, 003, 004) with the same structure. The two radiating body units (010, 020) are arranged in parallel, two adjacent units form a radiating body pair (010, 020), the surface current phases of the two radiating body units in each radiating body pair are the same so as to enhance radiation, the current phase difference of the two adjacent radiating body pairs is 90 degrees, and the current phase difference of the two radiating body groups is 180 degrees so as to realize circularly polarized radiation. And a pair of parallel metal strips (1) is connected between the two radiator groups to modulate impedance. The size of the antenna is close to that of an electrically small antenna, but the impedance bandwidth of 11.18% is obtained, the 3dB wave width reaches 160 degrees on different sections and is uniform and stable, and the application potential in the aspects of indoor communication and satellite navigation is huge.

The application relates to the technical field of wireless communication, and discloses an electrically small antenna based on a magic cube structure, which comprises a metal ring structure formed by three-dimensional orthogonal folding, a cubic magic cube structure formed by splicing at least three different types of substrates, and three substrates with different quantities; the metal ring structure is printed on six substrates of the cubic magic cube structure by a microstrip line; wherein the metal ring structure excites a combination of a multi-magnetic double ring and an electric doublet in a single-feed or double-feed mode, and realizes omnidirectional radiation or dual-polarization function under a small electric size (ka < 1). The application can realize omnidirectional radiation or dual-polarization function under a small electric size (ka < 1), and the cubic frame formed by self-splicing of the substrates has electromagnetic isolation characteristics without additional packaging.

This invention belongs to the field of antenna technology, specifically relating to an omnidirectional small electric antenna, comprising: a metal cavity having a cavity enclosed by a shell; at least one set of antenna radiators located inside the metal cavity; and a bus connected to the metal cavity. This invention is small in size and lightweight, can be integrated inside a black box, is not easily affected by external electromagnetic interference, and provides stable antenna operation. The antenna's radiation performance is not affected by either side of the black box facing upwards.

The utility model discloses a dual-polarization electrically small antenna probe used for a VHF frequency band, a first linear polarization matching dipole antenna unit and a second linear polarization matching dipole antenna unit which have the same working frequency respectively comprise a PCB substrate, an antenna copper sheet, a Balun matching circuit and a radio frequency line, the PCB substrates are orthogonally spliced to form a cross structure, and the antenna copper sheet and the Balun matching circuit are arranged in the cross structure. The surface of one end of each PCB substrate is printed with an antenna copper sheet, the antenna copper sheets on each PCB substrate are arranged in a bilateral symmetry mode along an orthogonal splicing line of the PCB substrate, and each PCB substrate is provided with a balun matching circuit and a radio frequency line. The two groups of antenna copper sheets on each PCB substrate are respectively connected and conducted with the Balun matchers of the Balun matching circuits through radio frequency lines to realize antenna input feed, the miniaturization of the antenna probe is obviously realized, the compact application requirement can be met, and the stability and the reliability of antenna signal transmission are effectively improved.