246results about "Logperiodic antennas" patented technology

A multi-band antenna has a feed point, a grounding location, a first portion for low band operation, a second portion for low band operation, and one or more portions for high band operation. The ground reference of the feed point for the multi-band antenna is connected to a separate object that may provide a base for the multi-band antenna. The feed point of the multi-band antenna may be spaced above the base and have a space between the feed point and a location for the ground point. The low band portion has multiple resonances that are often odd multiples of the lowest resonant response. The portions that resonant most dominantly in the high band often have multiple resonances that are even multiples of the lowest high band resonance. The multi-band antenna has resonances spaced closely enough to appear to be a wide band antenna above the fundamental high band resonance.

Embodiments of the present invention provides an antenna and an antenna system. The antenna includes a body member, a head member integrally connected to a first edge of the body member, wherein the head member forms a fold having a first angle towards the front face of the body member, and a first arm member and a second arm member, wherein the first arm member and the second arm member are integrally connected to the body member corresponding to the second edge and the third edge of the body member, and wherein the set of arm members each form a fold having a second angle towards the front face of the body member.

A helix antenna and methods of making and using helix antenna to concurrently or independently radiate pulses in a very high frequency (VHF) band in a range of about 240 MHz to about 270 MHz and / or in an ultrahigh frequency (UHF) band in a range of about 360 MHz to about 380 MHz which can be useful in space to ground data transmissions, subsurface radar, and measurement of ice and snow pack.

The invention discloses an ultra-wide beam broadband four-arm helical antenna based on parasitic loading. The ultra-wide beam broadband four-arm helical antenna comprises a circular dielectric substrate, an arc parasitic radiation arm, a cylindrical support, a flexible dielectric substrate, a stepped impedance winding helical arm, a floor and a coaxial feed. The antenna can realize wide axial ratio beam width and wide half-power beam width in a working frequency band range of 2-2.5 GHz, meanwhile, the antenna has a relatively small size, the stability, the anti-interference capability and the coverage range of a wireless communication system are improved, and the antenna can flexibly cope with various complex scenes. In addition, the antenna works in a wide frequency band and has a wide 3-dB axial ratio beam width in the wide frequency band, for example, the 3-dB axial ratio beam width at a 2.2 GHz frequency point reaches 235 degrees; the 3-dB axial ratio beam width at the 2.3 GHz frequency point reaches 252 degrees; and the 3-dB axial ratio beam width at a 2.4 GHz frequency point reaches 236 degrees.

The invention belongs to the technical field of antennas, and relates to a circularly polarized antenna array, which comprises four antennas distributed in an array, the antenna comprises a first radiation layer, a first dielectric layer, a second radiation layer, a second dielectric layer and a floor layer which are sequentially stacked from top to bottom, the first radiation layer comprises two spiral radiation arms which are arranged at an interval and are distributed in a central symmetry manner so as to form a circularly polarized spiral antenna; the second radiation layer and the first radiation layer are connected and have the same structure; the first radiation layer and the second radiation layer are connected with the feed structure; the radiation arms comprise a first radiation arm and a second radiation arm; the initial ends of the first radiation arm and the second radiation arm are arranged in the middle of the first dielectric layer, the terminal of the first radiation arm is arranged in the middle of the antenna array, and the terminal of the second radiation arm is arranged at the corner of the antenna array. According to the invention, ultra wide band, high gain, circular polarization and interference resistance can be realized at the same time, the axial ratio performance is good, and miniaturization is facilitated.

Embodiments disclosed herein show a novel helical meandered antenna, wherein some embodiments feature tunability through the application of DC voltage to switch and connect multiple antenna arms. The design, successfully fabricated and tested for wireless applications, exhibits a compact size and omnidirectional radiation pattern. The use of diodes as effective components for tunability is explored, allowing adjustments in the operating frequency of the helix. Extensive simulations and measurements were conducted on over 15 different antenna designs, showing consistent results. The proposed helical antenna demonstrates a fine-tunable operation frequency change from 459 MHz to 338 MHz (over 30% change) with low voltage supplied DC from 0 V to 1.5 V.

The invention discloses an ultra-wideband low-profile feed source loaded with a step medium, and relates to the field of ultra-wideband feed sources. The antenna comprises four log-periodic antennas, four groups of step dielectrics, dielectric cylinders, a reflection floor, a metal cavity and two feed baluns, the four log-periodic antennas are divided into two pairs which are orthogonally arranged, each pair comprises two log-periodic antennas which are oppositely arranged, the log-periodic antennas are fixed on the dielectric cylinder through screws, and an included angle is formed between the log-periodic antennas and the reflection floor; each group of stepped dielectric is formed by arranging twelve dielectric blocks in height stepped distribution, is positioned between the log-periodic antenna and the reflection floor, and clings to the reflection floor; the two feed baluns are orthogonally arranged, and each balun comprises a dielectric substrate, an index gradient microstrip line and a one-to-two power divider. The antenna is wide in frequency band, low in profile and suitable for serving as a primary radiator of a reflector antenna in the fields of satellite communication, radar detection, radio astronomy and the like.

The invention relates to a niobium telluride terahertz photoelectric detector based on logarithmic composite antenna integration and a preparation method thereof, which are characterized in that a niobium telluride material obtained by mechanical stripping is transferred to an intrinsic high-resistance silicon substrate through a dry method, and a source electrode, a drain electrode and a corresponding antenna structure are manufactured by using an ultraviolet lithography technology. And the logarithmic composite antenna niobium telluride terahertz photoelectric detector is prepared by using processes such as electron beam evaporation and the like. Compared with a traditional logarithmic antenna, the logarithmic composite antenna structure has higher field intensity gain on terahertz waves, so that the logarithmic composite antenna niobium telluride terahertz photoelectric detector has higher sensitivity on the terahertz waves.

The invention relates to a folding and unfolding joint for an antenna, and belongs to the technical field of antennas. The device comprises a middle support and two connecting seats, wherein the two ends of the middle support are connected with the corresponding connecting seats through bearings; each connecting seat is provided with an upper group of spring connectors and a lower group of spring connectors, the two opposite upper groups of spring connectors are connected through SMA springs a, the two opposite lower groups of spring connectors are connected through SMA springs b, and the SMA springs a and the SMA springs b are located above and below the middle support respectively. The log-periodic antenna can be folded and unfolded by adopting a novel shape memory alloy material, so that the log-periodic antenna is smaller and more portable.

A communication system is disclosed that features a computing device, a radiating element coupled to the computing device and including a primary helical coil, a secondary helical coil positioned within the primary helical coil, one or more inductor coils that are free to rotate positioned within the secondary helical coil, an optohelical antenna, a central core positioned within the one or more inductor coils, one or more central core coils positioned within the central core, and a central core cavity positioned within the one or more central core coils, in which the central core cavity includes a plasma and / or a gain medium which exhibits magnetic resonance, spontaneous emission, stimulated emission, and / or absorption. The communication system includes a signal injection circuit, a signal detection circuit communicatively coupled to the computing device, and a control module communicatively coupled to the computing device to determine a mode of a transceiver module.

The invention provides a high-gain broadband antenna based on a resonant ring and lens structure. A main body part of the antenna comprises a bow-tie dipole broadband log-periodic antenna fed by a parallel strip-shaped microstrip line, a lens, a resonant ring, a supporting back plate and a supporting arm. And the lens structure is formed by processing a Teflon material. The top of the parallel strip-shaped microstrip line feed bow tie dipole broadband log-periodic antenna body part is composed of a microstrip line and three bow tie elements with different sizes, and the bottom of the parallel strip-shaped microstrip line feed bow tie dipole broadband log-periodic antenna body part is composed of three bow tie elements which are transited to the microstrip line and have the same size with the top but are symmetrical in direction, wherein the plane conical shape is symmetrical to a quarter circle. The SMA interface on the back is embedded in the center of the supporting backboard, the lens is located at the end-to-end of the feed source antenna, the structure of the lens is composed of a semi-sphere on the top and two cylinders with different radiuses at the bottom of the middle, and the lens is connected with the supporting backboard through the supporting arm. And the resonant ring is located at the tail end of the log-periodic antenna structure. The working frequency band of the antenna ranges from 7.18 GHz to 12.55 GHz, the gain in the frequency range ranges from 11.1 dBi to 16.0 dBi, and the gain is the highest when the frequency is 10.0 GHz. The antenna has the advantages of simple structure, low cost, wide band, high gain and the like.

An antenna system is provided. The antenna system includes a base structure, a transmission line, a ground plane, and a backfire antenna element. The transmission line extends from the base structure and is coupled to the base structure at a first end of the transmission line. The ground plane is coupled to the transmission line at a second end of the transmission line. The backfire antenna element extends between the ground plane and the base structure. The backfire antenna element is coupled to the second end of the TEM line.

This application provides an antenna, antenna array, and communication device, aiming to construct more degrees of freedom and antenna ports within a limited antenna panel size. The antenna includes: four independent feed points; and four helical arms corresponding one-to-one with the four feed points, each helical arm connected to its corresponding feed point. The helical end of each helical arm can be connected to its corresponding feed point using an open-circuit stub structure, and / or, the end of each helical arm can be coupled to a parasitic patch, and / or, the spacing w between two adjacent helical arms satisfies: w ≤ λ / 10, where λ is the operating wavelength. This design provides four degrees of freedom and widens the antenna bandwidth. Within the limited antenna panel size, this is beneficial for improving system throughput.

Single band and multiband wireless antennas are an important element of wireless systems. Competing tradeoffs of overall footprint, performance aspects such as impedance matching and cost require not only consideration but become significant when multiple antenna elements are employed within a single antenna such as to obtain circular polarization transmit and / or receive. Accordingly, it would be beneficial to provide designers of a wide range of electrical devices and systems with compact single or multiple frequency band antennas which, in addition to providing the controlled radiation pattern and circular polarization purity (where required) are impedance matched without substantially increasing the footprint of the antenna and / or the complexity of the microwave / RF circuit interfaced to them, whilst supporting multiple signals to / from multiple antenna elements in antennas employing them. Solutions present achieve this through provisioning one or more capacitive series reactances discretely or in combination with one or more shunt capacitive reactances.

Among existing antennas, there were no (A) coiled antennas capable of transmitting and receiving on three or more amateur bands (amateur radio frequency bands) in the MF and HF bands, and (B) coiled antennas capable of transmitting and receiving on three or more amateur bands in the VHF and UHF bands without a matching circuit. [Solution] In the present invention, antennas A and B are realized by winding the coil with a slight fold back in the same rotation direction, and by optimizing the coil pitch and number of turns.

The present invention discloses a gradient voltage-excited miniature ultra-wideband directional antenna comprising eight arrays and a logarithmic periodic silicon-based support structure. The arrays are directly bonded to the logarithmic periodic silicon-based support structure, forming periodically arranged array pairs. Each array is directly fed by a voltage source, and each array pair generates strong resonance, enhancing the frequency of the corresponding array and increasing the antenna gain. Eight arrays are bonded above the logarithmic periodic silicon-based support structure, with the eight arrays spaced evenly and distributed in a logarithmic pattern. Eight arrays are bonded below the logarithmic periodic silicon-based support structure, with the eight arrays spaced evenly and distributed in a logarithmic pattern, and the eight arrays are aligned above and below. The present invention utilizes gradient voltage excitation, breaking through the inherent relationship between antenna wavelength and antenna size. This achieves miniaturization while providing extremely wideband coverage from very low frequencies to millimeter waves and enhancing antenna gain.

An RFID transponder (1) comprising a radiating antenna (2) and a pod (3), a pod (3), and a method of manufacturing a panel (29) including the pod (3) are disclosed.

To provide an antenna system.SOLUTION: An antenna system includes a base structure, a transmission line, a ground plane, and a backfire antenna element. The transmission line extends from the base structure and is coupled to the base structure at a first end of the transmission line. The ground plane is coupled to the transmission line at a second end of the transmission line. The backfire antenna element extends between the ground plane and the base structure. The backfire antenna element is coupled to the second end of a TEM line.SELECTED DRAWING: Figure 1

A helix antenna structure includes loop antennas and a multilayered printed circuit board including printed circuit board layers. Each printed circuit board layer includes a peripheral loop antenna and each adjacent two loop antennas are electrically connected by a connection bridge functioning as a monopole antenna. A selected printed circuit board layer physically and electrically accommodates a transmitter inside ‘its’ peripheral loop antenna, and it further includes a first antenna feeding line which is connected to the loop antenna that is disposed on the selected printed circuit board layer and electrically connectable to a first output terminal of the transmitter. A second antenna feeding line is disposed on another printed circuit board layer and electrically connected to its loop antenna and connectable to another output terminal of the transmitter. The two antenna feeding lines lie in a plane perpendicular to an axis of the printed circuit board after its folding.

The present application relates to a three-dimensional new radio frequency front-end device, including a new antenna device and a radio frequency transceiver device, and the number of radio frequency transceivers is two or more. The three-dimensional new radio frequency front-end device firstly adopts a cross structure to realize the dual-polarization structure of two single-polarization antenna units, realizes a new dual-polarization logarithmic periodic antenna, can reduce signal polarization loss, and make the antenna device have excellent gain in both horizontal and vertical directions. At the same time, the antenna vibrator can induce the same-phase current on the reflective disk, further improving the gain of the new dual-polarization logarithmic periodic antenna. Secondly, by arranging the antenna array composed of dual-polarization logarithmic periodic antennas on a substrate, the new antenna device is designed as a three-dimensional array structure, so that the new antenna device can form a vertical plane beam, and finally connected with the corresponding radio frequency transceiver device, the new antenna device is managed for signal transmission and reception through the corresponding radio frequency transceiver device, thereby improving the overall gain of the antenna.

The present invention provides a shortwave array antenna and a vehicle-mounted communication system, and relates to the field of communication technology. The shortwave array antenna provided by the present invention includes: a logarithmic periodic antenna, a dual three-wire loaded dipole antenna and a bracket; the logarithmic periodic antenna is located above the dual three-wire loaded dipole antenna, and the logarithmic periodic antenna and the dual three-wire loaded dipole antenna are respectively installed on the bracket. The logarithmic periodic antenna is used to achieve medium and long-distance communication, and the dual three-wire loaded dipole antenna is used to achieve short-distance communication, thereby achieving both short-distance and long-distance communication capabilities. In addition, the shortwave array antenna can be mounted on a vehicle platform, can achieve high gain and broadband, meet the effective and reliable communication requirements of short, medium and long distances, and can also move in real time to meet the needs of rapid deployment in specific areas, and can effectively solve the problem of insufficient short-distance communication resources in hot spots.

The invention discloses a dual-frequency four-arm helical antenna with ultra-low profile and wide-angle radiation characteristics. The dual-frequency four-arm helical antenna comprises a first circular ring dielectric substrate, sickle-shaped radiation arms, an FPC dielectric substrate, helical radiation arms, a circular ring-shaped support, a covering film, a floor and a coaxial feed. The antenna can realize wide axial ratio beam width, wide half-power beam width and relatively high gain in a working frequency band range of satellite navigation, has an ultra-low profile, can be used for realizing an unmanned aerial vehicle-mounted satellite navigation terminal with low wind resistance and high sensitivity, and effectively improves the positioning precision and speed of a high-speed motion carrier.

An antenna apparatus and method of operating the antenna apparatus, can include a helical antenna comprising a helical portion raised from a printed circuit board to optimize gain and bandwidth, wherein the helical portion incorporates a limited number of turns, which facilitate control over the dimensions of the helical antenna. An antenna support can be provided, which can maintain dimensional consistency with respect to the helical antenna. The antenna support can facilitate achievement of target performance parameters for the antenna apparatus. In addition, the elevated helical portion can be configured to enhance the gain and the bandwidth without compromising the overall dimensions of the helical antenna. In some embodiments, the helical antenna may be formed from plastic.

An antenna 10 comprises a single wire wound in a helix 12 comprising a plurality of turns 1, 2, 3, n, n+1,... p around a main axis 11 with immediately adjacent turns having an inter-turn spacing between them. The helix has a back end 14 and a front end 16 and the main axis defines a main beam direction. A transverse crosssectional area of the helix monotonously decreases from the back end 14 to the front end 16. The inter-turn spacing S1... Sn... monotonously decreases from the backend 14 to the front end 16. A feed-point 13 is provided at the back end 14.

The present invention relates to a space electromagnetic energy collection system based on a planar logarithmic periodic antenna, and belongs to the field of electromagnetic technology. The system includes an improved planar logarithmic periodic antenna, an impedance matching rectifier unit and a power management unit; wherein the improved planar logarithmic periodic antenna is used to receive radio frequency signals in the 0.5GHz-3GHz frequency band in the environment; the impedance matching rectifier unit is connected to the improved planar logarithmic periodic antenna, wherein the impedance matching part realizes the maximum acquisition of the received signal, ensures that each link of the system maintains a standard impedance of 50 ohms, and the rectifier and filter part is composed of a transmission line, a fan-shaped branch and a diode rectifier array, and performs "signal-energy" conversion; the present invention improves the electromagnetic energy collection efficiency, can effectively extend the standby time of the Internet of Things terminal, and can solve the self-power supply problem of the ultra-low power consumption Internet of Things terminal, and has broad application prospects in the field of the Internet of Things.

This antenna system comprises at least one elementary antenna, a metallic plane provided around the elementary antenna, and a decoupling device (150) disposed on the metallic plane, the decoupling device being of the type three-dimensional electromagnetic absorption structure made up of a plurality of cells arranged in a network, each cell (152) comprising, stacked in a direction normal to the metallic plane, a base (154) surmounted by a raised wall, the antenna system being characterized in that the raised wall (156) is shaped so as to form a hollow pattern for trapping electromagnetic waves.

Transmitters, receivers, transceivers, transport networks, and methods of use are described herein, including a transmitter comprising a client-side input, transmitter circuitry, and antennas. The client-side input receives baseband signals having client data encoded therein. The transmitter circuitry receives the baseband signals from the client-side input and generates antenna feed signals based on the baseband signals. The antennas receive the antenna feed signals from the transmitter circuitry, generate radiated signals based on the antenna feed signals, and couple the radiated signals into hollow waveguides. The radiated signals are radiated electromagnetic waves configured for coherent detection and having one or more frequencies in a range between 300 Gigahertz (GHz) and 10 Terahertz (THz). The antennas include one of a helical antenna, a waveguide probe antenna, a tapered antenna, a patch antenna, and a slot antenna.

The radio frequency device is characterized in that the radio frequency device is provided with a spiral antenna and a radio frequency module, and the first end of the spiral antenna is electrically connected with a radio frequency interface of the radio frequency module; the spiral antenna structurally comprises a core material and a spiral conductor wound and fixed on the periphery of the core material. The spiral conductor is made of a single or a plurality of bundled metallized fibers, metal wires or carbon fiber wires, and the radius of each metallized fiber, metal wire or carbon fiber wire is 1t; the frequency of the radio-frequency signal is five times of the skin depth when the radio-frequency signal is transmitted on the metallized fiber, the metal wire or the carbon fiber wire; the helical antenna has an extremely high quality factor, so that a communication distance which is several times of that of a traditional helical antenna is obtained under the same power.