41results about How to "Change electrical length" patented technology

A compact, efficient and electronically tunable antenna is presented. A single-fed resonant slot loaded with a series of PIN diode switches constitute the fundamental structure of the antenna. The antenna tuning is real by changing its effective electrical length, which is controlled by the bias voltages of the solid state shunt switches along the slot antenna. Although the design is based on a resonant configuration, an effective bandwidth of 1.7:1 is obtained through this tuning without requiring a reconfigurable matching network. Four resonant frequencies from 540 to 890 MHz are selected in this bandwidth and very good matching is achieved for all resonant frequencies. Theoretical and experimental behavior of the antenna parameters is presented and it is demonstrated that the radiation pattern, efficiency and polarization state of the antenna remain essentially unaffected by the frequency tuning.

The invention discloses a dielectric sliding type phase shifter and a base station antenna. The dielectric sliding type phase shifter comprises a cavity, a feed network and a phase shifting unit. Thefeed network includes a functional circuit and phase shifting circuits. The surfaces of the phase shifting circuits are covered with dielectric plates, by rotating the dielectric plates, the length ofthe phase shifting circuits covered by the dielectric plates can be changed, and then the electrical length of a transmission line can be changed to realize phase adjustment. Furthermore, the phase shifting circuits and the dielectric plates are in an arc shape. Therefore, when the dielectric plates of the phase shifting units rotate around the axis passing through the center of the circle, the dielectric plates are limited within a circle range without exceeding the range of the corresponding phase shifting circuits. That is to say, the processes that the phase-shifting circuits realize phase adjustment are relatively independent. Therefore, functional circuits and phase shifting circuits can be designed independently, the design space of the circuit is greatly improved, the design difficulty of the phase shifter is greatly reduced, and the problem of limited design space of circuits in a traditional dielectric sliding type phase-shifter is solved.

The invention belongs to the field of wireless signal transmission technology application, particularly relates to a dual-polarized omnidirectional metasurface antenna, and aims at solving the problem that a traditional micro-strip antenna is narrow in bandwidth and can hardly realize dual-polarization omnidirectional radiation. The metasurface antenna comprises a micro-strip feed structure 5, a lower dielectric substrate 4, a metal grounding plate 3, an upper dielectric substrate 2, a metasurface radiation structure 1 and a coaxial probe feed structure 6 which are sequentially stacked from bottom to top, wherein the metasurface radiation structure is in 90-degree rotational symmetry with the center of the upper dielectric substrate as the rotational symmetry center. The strongest current distribution positions of a horizontal omnidirectional radiation mode and a vertical omnidirectional radiation mode are separated through the structural design of the metasurface radiation structure, and a reasonable feed structure is adopted to ensure that the two polarization modes have the advantages of broadband radiation characteristic and high isolation. Finally, the design of a low-profile dual-polarized omnidirectional metasurface antenna is realized, and the antenna has the characteristics of wide band and high isolation.

The invention provides a watchband antenna for a wearable wireless system, including a watchband and a feed device arranged on the watchband. The watchband is made of a metallic material and is provided with at least one gap. The feed device includes a microstrip dielectric substrate, a metal ground disposed on the microstrip dielectric substrate, and a feed probe. The feed probe penetrates the metal ground and the microstrip dielectric substrate and is inserted into and connected in the gap in the watchband. The watchband antenna is easy to install, solid in structure, low in price, light in weight and small in size, and reduces the burden on users. With the watchband antenna structure, the antenna radiation is achieved, and the selection range of the wearable wireless system antenna is expanded.

The invention belongs to the field of wireless signal transmission technology application, and particularly provides a horizontally-polarized omnidirectional metasurface antenna to simultaneously meet the requirements of broadband, miniaturization and simple structure. The antenna comprises a micro-strip feed structure 5, a lower dielectric substrate 4, a metal grounding plate 3, an upper dielectric substrate 2 and a metasurface radiation structure 1 which are sequentially stacked from bottom to top, wherein the metasurface radiation structure 1 is composed of four square patches A and twelve square patches B, the four square patches A are arranged in the center of the upper dielectric substrate in a 2 * 2 array, and the twelve square patches B are arranged around the four square patches A. The strongest current distribution position of a horizontal omnidirectional polarization mode is always fixed on a specific patch through the structural design of the metasurface radiation structure, and a reasonable feed structure is arranged to ensure that the desired horizontal-polarization omnidirectional radiation mode is efficiently excited in a broadband range.

The present invention relates to a cross-band frequency-conversion antenna based on an intelligent paper folding structure, belonging to the field of frequency reconfigurable antennas. The antenna comprises a substrate, an antenna arms, a coaxial feeder, a radio frequency coaxial connector and a RF signal emitter; the substrate employs a self-locking square-twist folding structure; the middle portion of the substrate is provided with a cross-line hole, the two antenna arms are symmetrically glued and fixed at the upper side plate surface of the substrate, the initiating terminal of each antenna arm is extended outwards from the cross-line hole, each antenna arm is located the panel overlapping position for ducking in a folding state; the initiating terminals of the antenna arms are respectively connected with two output ports of the RF signal emitter through the coaxial feeder via the radio frequency coaxial connector, and output signal phase difference of two ends of the RF signal emitter is 180 degrees. The antenna can be subjected to self unfolding through heating to change working frequency, the influence of frequency modulation on performances of the antenna is little, the frequency tuning amplitude is large, and cross of different wave bands can be achieved.

The present invention provides an antenna, an adjustment method thereof, and a mobile terminal, and relates to the technical field of communication. The objective of the invention is to solve the problem that the adjustment of the antenna in the prior art is not flexible enough to affect the radiation performance of the antenna. The antenna includes: a metal back shell, a metal radiating sheet, and an insulating medium connecting the metal back shell and the metal radiating sheet. A liquid metal adjusting portion is arranged in the insulating medium, and the liquid metal adjusting portion includes an insulating pipeline. The insulated pipe is formed into a plurality of folds which goes back and forth between the metal back shell and the metal radiating sheet. Each turn of the insulating pipe is in contact with the metal back shell or the metal radiating sheet. An opening is arranged in the pipeline wall of each of the turns. The openings are sealed by the metal back shell or the metalradiating sheet. The middle section of the insulating pipeline is loaded with liquid metal. Two ends of the insulating pipeline and the liquid metal encapsulate a segment of gas.

The invention discloses a high-gain slot antenna based on a graphene three-dimensional phase tunable lens and a method. The antenna adopts the graphene three-dimensional phase tunable lens, and the graphene three-dimensional phase tunable lens is placed at the front end of the slot antenna, so that the slot antenna can tune the lens unit through the reconfigurable characteristic of graphene under different bias voltages. Different bias voltages can change the surface resistance of the graphene material, so that the characteristics of the lens can be changed, the energy and phase distribution in the aperture of the slot antenna can be changed, the gain of the antenna can be improved, and the directional diagram distortion of the antenna can be eliminated. Meanwhile, the lens-loaded slot antenna is a novel mixed graphene-metal structure slot antenna, and a radiation slot structure of the antenna is replaced by a graphene structure, so that control of energy in the aperture of the antenna is further enhanced, and the frequency reconfigurable characteristic is brought to the slot antenna.

The present invention provides an antenna structure processing method, comprising: providing a conductive shell, wherein the conductive shell comprises a first conductive body, a second conductive body, and a preset region comprising a first surface and a second surface which are oppositely arranged; forming at least one support structure on the first surface of the preset region, to enable the at least one support structure to be convexly arranged on the first surface; processing in the direction from the second surface to the first surface, and cutting through the preset region to form a preset number of micro seams; filling each micro seam with non-conductive material, to make the preset region become a non-signal shielding microstructure; and removing remaining support structures in the at least one support structure other than the designated support structure. By means of the antenna structure processing method in the exemplary embodiment of the present invention, since the seam width of each micro seam is relatively narrow, the proportion of the non-conductive material of the antenna structure is reduced, and the appearance integrity of the antenna structure is guaranteed; and since the designated support structure is reserved, the electrical length of an antenna can be changed, so that the antenna frequency is adjusted.

The invention provides a coaxial feed capacitance-loaded triple-polarized slot antenna, and relates to a slot antenna. The antenna comprises three single-polarized antennas (11), which are perpendicular to each other, wherein each antenna (11) comprises a dielectric substrate (1), a metal ground plane (2), a radiation slot (3) and a coaxial feeder line (4); each metal ground plane (2) and each radiation slot (3) are arranged on the corresponding dielectric substrate (1); each radiation slot (3) is formed in the corresponding metal ground plane (2); two ends of each radiation slot (3) are short-circuited; a plurality of capacitors (7) are arranged in each radiation slot (3) and are bridged to the edge of the radiation slot (3) in parallel; an antenna port (8) is arranged at one end of each coaxial feeder line (4); and an inner conductor (9) at the other end of each coaxial feeder line (4) strides across the corresponding radiation slot (3), is located at the edge (10) of the corresponding radiation slot (3) an d is connected with the corresponding metal ground plane (2). According to the antenna, the antenna dimension, cross polarization and shielding can be reduced, and isolation can be improved.

A grating slit ground metal via hole stepped impedance tri-polarization slot antenna is disclosed and relates to a slot antenna. The antenna consists of three single-polarized antennas (13) that are perpendicular to one another; each antenna (13) comprises a dielectric substrate (1), a metal ground (2), a radiation slot (3) and a micro-strip feed line (4), wherein the metal ground (2) and the radiation slot (3) are arranged on the dielectric substrate (1), the radiation slot (3) and a plurality of parallel grating slits (6) are arranged on the metal ground (2), two ends of the radiation slot (3) are short circuits, the middle part of the radiation slot (3) is provided with two rows of metalized via holes (7), and therefore a low impedance slot (8) is formed; the rest part of the radiation slot (3) is a high impedance slot (9), one end of the micro-strip feed line (4) is an antenna port (10), and the other end of the coaxial feed line (4) is an open circuit which crosses the high impedance radiation slot (9) and extends beyond the same for a length. The antenna allows multi-frequency-band work; reduction of an antenna size, cross polarization and blocking is enabled; isolation improvement can be realized.

The capacitively loaded half-slot antenna relates to a slot antenna, which includes a dielectric substrate (1), a metal ground (2) on the dielectric substrate (1), a radiation slot (3), a microstrip feeder line (4); the metal ground (2) There is a radiation slot (3); one end of the radiation slot (3) is short-circuited, and the other end (6) is open; remove the part (8) intersecting with the microstrip feeder line (4) at the radiation slot (3) ), there are several capacitors (7) connected in parallel across its edge; one end of the microstrip feeder (4) is the antenna port (10), and the other end of the microstrip feeder (4) is open and crosses the radiation slot (3) and stretch for a length. The antenna reduces antenna size, cross polarization, shadowing and improves isolation.

A slot antenna of metal via hole stepped-impedance relates to a slot antenna, and comprises a dielectric substrate (1), a metal ground (2) and a radiation slot (3) which are arranged on the dielectric substrate (1), and a micro-strip feeder line (4). The radiation slot (3) is arranged on the metal ground (2), and the two ends of the radiation slot (3) are in short circuit. Two rows of metallization via holes (7) at the middle part of the radiation slot (3) are in array arrangement to form a low-resistance slot (8), and the rest part of the radiation slot (3) is a high-resistance slot (9). One end of the micro-strip feeder line (4) is an antenna port (10), and the other end is in open circuit, spans the high-resistance slot (9) and extends a certain length. The antenna is in multi-frequency band work, enables the size and the shelter to be reduced and the isolation to be improved, and restrains the cross polarization.

The invention discloses a metal through hole stepped-impedance half-slot antenna which comprises a medium substrate (1), a metal ground (2) and a radiation slot seam (3) on the medium substrate (1), and a microstrip feed line (4). The radiation slot seam (3) is arranged on the metal ground (2). One end of the radiation slot seam (3) is designed as a short circuit while the other end (6) an open circuit. A low impedance slot seam (8) is formed by two rows of metal through hole (7) arrays near the end of the radiation slot seam with the open circuit. The rest part of the radiation slot seam (3) is a high impedance slot seam (9). One end of the microstrip feed line (4) is an antenna port (10) and the open circuit at the other end of the microstrip feed line (4) crosses the high impedance slot seam (9) and extends a certain amount of lengths. The antenna of the invention can work with multiple bands. With reduced size, the antenna achieves cross polarization. Well blocked, an improved isolation effect can be achieved as well.

The invention relates to a microwave technology, in particular to a directional coupler with adjustable X-band magnetic control frequency. Two rows of ferrite junctions are added in the SIW short-slit directional coupler, and a certain distance is kept between the two ferrite junctions in each row. Under the action of an external magnetic field, the ferrite junction is influenced and the equivalent inductance value of the SIW is changed through a magnetic field regulation and control mode, so that the electrical length of the transmission line is changed, the frequency of the transmission line is further changed, and finally, the frequency of the directional coupler is regulated. The device is low in delay, is not externally connected with an assembly structure, is simple, is small in size, is easy to integrate, and has a small influence on S31 (coupling degree) and S21 (insertion loss) under the condition that the frequencies of S11 (standing wave) and S41 (isolation) are synchronously adjusted. And high-power transmission is facilitated.