374 results about "Cross slot" patented technology

A duplex polarization antenna includes a radiation array set on a reflection earth plate, four support conductors constituting two mutual vertical unbalanced transformers and supporting the radiation array on the reflection earth plate. The radiation array is formed by four equivalent conducting rings with symmetric lines and their heads and tails are connected, each forms a branch of the ring and a branch of a cross slot. The cross conductor has four symmetric lines, two of which belong to the conduction rings, the other two are the diagonal lines of cross conductors. The support conductors are connected to the diagonal lines of the earth plates and the cross conductors, the activated radiation array has two mutual vertical electromagnetic field owning vector E parallel to the diagonal.

The present invention discloses a method for suppressing cross-slot interference in a time-slotted CDMA system. The method includes: determining, by a base station, positions of cross slots according to configuration information of local cell and configuration information of co-frequency adjacent cells, and performing multi-cell channel estimation on the cross slots to obtain channel estimation results; determining, by the base station, code channel configuration information of the co-frequency adjacent cells, grouping the determined code channels and determining the code channels of the co-frequency adjacent cells involved in a joint detection; and performing, by the base station, the joint detection according to the multi-cell information estimation results and the determined code channels of the base stations involved in the joint detection to obtain detection data. With the present invention, interference from a base station transmitting downlink signals in cross slots to a base station receiving uplink signals in the corresponding slot may be reduced, and the system capacity and the stability may be improved.

A self-positioning and self-starting, tapered thread, orthodontic bone screw (25) for use in intra-oral corrections that serves as a craniomaxillofacial rigid post for orthodontic appliance fixation. The tip of the bone screw incorporates a defined sharp pin-point tack tip (2) to easily pierce the soft tissue and initially penetrate into the host bone for alignment and penetration. In series with the tack tip is a self-tapping, double, tapered thread (11) which allows an orthodontist to insert the bone screw post into the host bone in a single operation without the need for opening or flapping the surrounding soft tissue. As the bone screw penetrates the bone site, the tapered threads (24) allow for easy thread pick-up into the host bone while the increasing outer diameter of the thread (26) rigidly locks into the crestal bone. Once attached and fixated in the host bone, the distal cylindrical dome shaped driver head (12) acts as the fixation post for the anchorage of orthodontic appliances. Incorporated into the cylindrical dome shaped driver head are several attachment features including cross holes (13) and a snap-on undercut groove (19) for attaching orthodontic appliances either individually or simultaneously. The dome shaped head also incorporates a spline driver feature for easy pick-up, assembly and insertion of the screw with a corresponding spline driver tool (27) that allows the screw to be driven with either a standard square or cross slot driver feature.

The invention discloses a synchronization method of femtocell and macrocell. The method comprises the following steps: determining the propagation time delay TAB between femtocell and macrocell; calculating the difference of the guard period length of macrocell and the twice of the TAB, using the difference value as the guard period length of femtocell; and determining the TS0 initial position offemtocell to be the initial position postponement TAB relatively to the TS0 of macrocell, wherein a time slot which is the twice of TAB is between the uplink time slot and downlink time slot of femtocell. The invention also discloses an access method of the user equipment (UE). By using the synchronization method and access method of the invention, when the proportions of the uplink time slots and downlink time slots of femtocell and macrocell are the same respectively, the interference of cross slots can be avoided and the normal access of UE can be ensured.

Novel tools and techniques are provided for implementing FTTx, which might include Fiber-to-the-Home (“FTTH”), Fiber-to-the-Building (“FTTB”), Fiber-to-the-Premises (“FTTP”), and/or the like. In some embodiments, a method might include routing an F1 line(s) from a central office or DSLAM to a fiber distribution hub (“FDH”) located within a block or neighborhood of customer premises, via at least an apical conduit source slot. From the FDH, an F2 line(s) might be routed, via any combination of apical conduit main slot(s), cross slot(s), far-side slot(s), missile bore(s), bore hole(s), and/or conduit(s) (collectively, “Apical Conduit Components”), to a network access point (“NAP”) servicing one or more customer premises. An F3 line(s) might be distributed, at the NAP and from the F2 line(s), to a network interface device (“NID”) or optical network terminal (“ONT”) at each customer premises, via any combination of the Apical Conduit Components, which include channels in at least portions of roadways.

A crossed-slot antenna is fabricated using rectangular sheet of metal. A crossed-slot is etched or stamped in the sheet of metal. A feed structure is similarly formed in the sheet of metal. Sidewalls are integrally formed with the sheet of metal and are bent to form a rectangular box. A circuit board is attached to the rectangular box. An air-filled cavity is defined by the sheet of metal, the sidewalls, and the circuit board. Alternatively, a crossed-slot antenna with a solid cavity is fabricated using a sheet of plastic. Ridges are formed in a cross pattern on the sheet of plastic. The sheet of plastic is plated with metal. The metal is removed from a surface of the sheet of plastic, exposing the ridges.

An antenna apparatus and method includes an orthogonal slot antenna which overcomes the limitations associated with RF choke between the adjacent slots through various feed techniques. A cavity backed cross-slot antenna includes a horizontal slot antenna, a vertical slot antenna sharing a center portion with the horizontal slot antenna, a first feed for the horizontal slot antenna, and a second feed for the vertical slot antenna, the first feed and the second feed provided to the shared center portion. Another cavity backed cross-slot antenna includes a horizontal slot antenna, a vertical slot antenna, the horizontal slot antenna and the vertical slot antenna share a center portion therebetween, a first feed feeding both halves of the horizontal slot antenna, and a second feed feeding both halves of the vertical slot antenna.

The invention provides a circularly polarized F-P resonant cavity antenna with high gain and low RCS, and aims to simplify the structure of the antenna and reduce the manufacturing cost of the antenna. The antenna comprises an upper dielectric plate and a lower dielectric plate, a wave-absorbing surface is printed on the upper surface of the upper dielectric plate, a partial reflection surface isprinted on the lower surface, the wave-absorbing surface comprises N*N wave-absorbing units arranged in a periodic manner, the wave-absorbing units adopt annular patch structures, four edges of the wave-absorbing units are provided with gaps, resistances are loaded on the gaps, the partial reflection surface comprises N*N partial reflection surface units arranged in a periodic manner, the partialreflection surface units adopt square patch structures, the center of each partial reflection surface unit is provided with a cross slot with different length and width, four edges of the partial reflection surface unit are provided with rectangular grooves, a rectangular metal patch is printed on the upper surface of the lower dielectric plate, a floor is printed on the lower surface, the rectangular metal patch and the floor are connected through a coaxial line, and a high-impedance surface formed by an area array formed by periodic arrangement of a plurality of strip-shaped metal patches isprinted around the rectangular patch.

The invention discloses a high-gain dual-frequency circularly polarized antenna based on a metasurface. The working frequency bands are a K wave band and a Ka wave band. A metal layer of the antenna comprises a micro-strip ring feeder line, a grounding plane with a cross slot and a metasurface. The micro-strip ring feeder line at the lowest position is coupled with the slotted grounding plane at the middle position. The electromagnetic wave energy is coupled to the metasurface of the uppermost layer and is radiated out. The sequential rotation structure of the micro-strip ring feeder line cangenerate a phase difference of 90 degrees so as to excite circular polarization. According to the feed structure, a wide axial ratio bandwidth can be realized; the metasurface can influence the axialratio bandwidth and gain of high and low frequency bands; the gain of the antenna in two frequency bands is greater than 5dBic; and the single-port feed dual-frequency circularly polarized antenna hasgood radiation characteristics in two frequency band bands, and is compact in structure and easy to process, so that antenna has a good application prospect in a wireless communication system.

The invention provides a wideband wide beam circular polarization medium resonator antenna suitable to X wave band, and belongs to the field of antennas. The antenna includes a medium substrate of which the right side is covered with a layer of metal surface mount device, a rectangular medium resonator which is arranged on the metal surface mount device, and an L-shaped feed microstrip antenna which is arranged on the back side of the medium substrate. The 4 corners of the bottom part of the rectangular medium resonator are dug out 4 same dimension rectangular medium blocks, and cross-slot-coupled the L-shaped microstrip antenna feed are adopted, so that the features of the wideband of the antenna area realized. The antenna is advantaged by wide frequency band, low profile, easiness to process, high stability of directional diagram within the working frequency band and wide wave beam width.

This invention discloses a method and a device for using cross slot resources in the time division duplex CDMA system conditions for using cross slots, assigning cross slot resources for users according to the designed conditions of using cross slots when a user applies for cut-in monitoring the cut-in user status in the cross slot to regulate and maintain the cross slot resources assigned to users. The device for realizing the said method is composed of a designing device, a storage device, a monitor device and a cross-slot distribution device.

The invention provides a microstrip reflective array unit loaded with a cross slot on the ground. The microstrip reflective array unit comprises a patch, a low-dielectric constant dielectric substrate, a high-dielectric constant dielectric substrate, a floor loaded with a cross slot, a foam layer and a floor, wherein the floor loaded with the cross slot is a metal flat plate opened with the cross slot at the middle, the foam layer is a honeycomb flat plate made of foam material or paper, and all adjacent layers are in close contact. Further, the invention also provides a microstrip reflective antenna. The antenna comprises a feeding source and a microstrip reflective array, wherein the feeding source is a pyramidal horn antenna, the microstrip reflective array comprises a plurality of microstrip reflective array units loaded with the cross slots on the ground, which are transversely, longitudinally and uniformly arranged. The unit loaded with the cross slot, provided by the invention, can work in two polarization directions perpendicular to each other, and different polarizations are completely independent to one another. The reflective array antenna has the performance of line-polarized wave conversion.

The invention provides an uplink and downlink slot time resource configuration method based on interference perception in a TDD system, which is applied to a communication network comprising a source base station, a target base station, as well as a user terminal in the source base station and a user terminal in the target base station, and the method comprises: judging whether the base station-to-base station interference is larger than a preset threshold value or not, if yes, canceling the uplink and downlink slot time resource configuration, and if no, continuously executing the next step; judging whether the interference measurement of the target base station on the user terminal in the source base station is larger than a preset threshold value or not, if no, executing the uplink and downlink slot time resource configuration, and if yes, executing the next step; judging whether the interference measurement of the source base station on the user terminal in the target base station is larger than a preset threshold value or not, if yes, canceling the uplink and downlink slot time resource configuration, and if no, executing the uplink and downlink slot time resource configuration. By the information interaction between the base stations, the flexible configuration of uplink and downlink slot time resources is realized, and the crossing slot time interference problem brought by the flexible configuration of the uplink and downlink slot time resources in different network structures is solved.

The screw bolt with nuts in the two end include screw bolt end plane, head nut, inward concave hidden nut, screw bolt, nut, spanner, inner hexagon spanner and Philips driver. The screw bolt has two nuts in its two ends, and its tail end has inward concave hidden nut without affecting the use of the thread on the screw bolt. The inward concave hidden nut may be in the shape of inward concave hexagonal slot or crossed slot for matching the inner hexagon spanner and the Philips driver separately. The present invention makes it possible to complete the screw-in and screw-out job in one work plane only.

The invention discloses a portable detection device for detecting a sighting line zero position of an infrared sniperscope, and belongs to the technical field of infrared optics detection. The conventional detection device is not a shaped special instrument. The detection device provided by the invention is characterized in that: a sealed hood is fastened on a base; a black body, a round disc target, a planar reflector and an off-axis parabolic mirror are fixed on the base and positioned in the sealed hood; a buckling base is fixed on the base and positioned out of the sealed hood. An infrared window is formed on the lateral wall of the sealed hood and opposite to the buckling base; a cross slot hole and a plurality of different round holes are formed on the round disc target; and the centre of the cross slot hole and the centers of a plurality of round holes are positioned on the same circle of the round disc target. The off-axis parabolic mirror, the infrared window and the buckling base are sequentially arranged by taking the axis of parallel light reflected by a reflector on the off-axis parabolic mirror as an axis. The black body, the centre of the cross slot hole or the center of one of the plurality of round holes and the planar reflector are coaxially arranged on one side of the axis of the reflector on the off-axis parabolic mirror as an axis sequentially.

The invention discloses a method for realizing butt joint of steel pipes by the aid of an axial cross plug board and a butt joint part. Two end of the cross plug board is embedded into steel pipe axial cross recesses at butt joint ends of the two steel pipes, the other ends, which are not embedded into respective the steel pipe axial cross recesses of the two steel pipes, of the cross plug boards are integrally in butt joint with angle steel, or at least one intermediate steel pipe is further serially connected between the butt joint ends of the two steel pipes. The two steel pipes are connected rigidly in a cross plug board butt joint mode, various internal force including axial force, bending moment, shearing force, torque and the like can be effectively transmitted, construction is carried out conveniently and safely, the steel pipes can be connected by bolts without welding an a field installation process, construction installation is carried out conveniently, the connection quality does not rely on the technical level of welding workers, fire hazards can be avoided due to a non-welding working mode, the method is wide in application range, multiple steel pipes in the same type can be axially connected in the cross plug board butt joint mode, and different types of steel pipes with different outer diameters, different section shapes, different wall thickness and the like also can be axially connected in the plug board butt joint mode.

The invention relates to a special experimental device for measuring performance of a cross groove bolt, i.e., a cross groove bolt torque detection device. The cross groove bolt torque detection device comprises a pedestal, wherein a cantilever type supporting frame is arranged on the pedestal; a supporting sleeve is vertically connected to a cantilever in a penetrating way; the lower end of the supporting sleeve is connected with a cross screwdriver, and the upper end of the supporting sleeve is connected with an axial load applying weight; the pedestal corresponding to the lower end of the supporting sleeve is provided with a bolt sample clamping component; and an indicating gauge type torque wrench is transversely arranged on the supporting sleeve. The cross groove bolt torque detection device has the advantages of simple structure, high accuracy, high repeatability, easy operation and feasibility.

The invention discloses a double-cross slot cavity antenna with a bidirectional co-spin circular polarization characteristic, and belongs to the field of antenna design. The antenna comprises a single layer dielectric substrate, metal via hole arrays, a front cross slot, a back cross slot and a coaxial feed port. Metal is coated on front and back surfaces of the single layer dielectric substrate. The edges of the single layer dielectric substrate are all surrounded by the metal via hole arrays, thereby forming a metal cavity structure. The front cross slot and the back cross slot are etched on the metal coated on the front and back surfaces of the single layer dielectric substrate as radiation structures. The coaxial feed port is located at the center of one edge of the dielectric substrate as a signal input end. According to the antenna, multiple frequency bands can be covered. The double-cross slot cavity antenna which has the bidirectional co-spin circular polarization characteristic and only employs the single layer dielectric substrate is realized. The impedance bandwidth, axial ratio bandwidth, directional diagram and gain performance of the antenna are good. Moreover, the antenna has the advantages of low profile, low cost and easy processing and is applied to a wireless communication device in a laneway environment.