CN116826337B - Network division calibration load and calibration piece for wireless communication network - Google Patents
Network division calibration load and calibration piece for wireless communication network Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a network division calibration load and a calibration piece for a wireless communication network, wherein the load is matched with a port of a network analyzer by setting the impedance value of a columnar resistor at a first end of a horn mouth to be 50 ohms, so that signals are smoothly absorbed without reflection, and the transmission quality is ensured; the columnar resistance impedance is gradually reduced by gradually reducing the diameter of the horn mouth, so that reflection and distortion are reduced, and the transmission stability is improved; by setting the columnar resistance of the horn mouth second end to 0, the signal is ensured to be completely absorbed at the second end, and reflection errors are avoided; in addition, the columnar resistor is inserted into the central needle, so that the connection stability is enhanced, the space is saved, meanwhile, the loss and reflection in the signal transmission process are reduced by utilizing the tight connection between the columnar resistor and the central needle, and the efficiency and the accuracy are improved; the spring is avoided, and the structure is simplified while the problems brought by the spring are avoided.
Description
Technical Field
The utility model relates to the technical field of wireless communication networks, in particular to a network division calibration load and a calibration piece for a wireless communication network.
Background
Wireless communication networks are computer networks that use radio waves or other electromagnetic waves as a medium for information transmission between network nodes, and network analyzers are widely used in the field of instruments for wireless communication, radar, microwave circuit design, etc., and in the calibration process of network analyzers, the loads used are called standard loads or calibration loads, which are accurate, stable resistors whose impedance values remain unchanged in the measurement frequency range, and since in wireless communication networks, 50 ohms is the most common characteristic impedance, the calibration loads typically have an impedance of 50 ohms.
In the calibration process, the network analyzer connects the test port to the standard load and then measures the response, and by comparing the actual measured value with the known standard load characteristics, the system can correct errors in the measurement process, thereby improving the accuracy of the measurement.
The utility model patent application number 200920255147X discloses a 3.5mm microwave coaxial matching load, as shown in FIG. 1, comprising: the connecting nut 11 is connected with the outer conductor 13 through a clamp spring 12, and an ultrahigh frequency resistor 14 with an exponential curve section on the outer surface is arranged in the outer conductor 13 with the elastic clamp head and is fixed by a lock nut 15.
The utility model adopts the ultra-high frequency resistor to solve the problem of standing wave coefficient deterioration, but in practice, the ultra-high frequency resistor has the problems of high price and limited precision, and the ultra-high frequency resistor has a larger temperature coefficient, the resistance value can change along with the change of temperature, and the measurement error under the high temperature environment is very large; the above problems result in the application of the uhf resistor in the calibration load always staying in the theoretical stage.
The utility model patent application number 2020210517424 discloses a millimeter wave calibration load, as shown in fig. 2, comprising: the device comprises a waveguide 1, wherein one end of the waveguide 1 is provided with a connecting end 3 connected with a knob 2, and the other end of the waveguide 1 is provided with a standard flange 4 used for being connected with a waveguide device to be tested; and the absorber is arranged in the connecting end 3 and is used for absorbing interference signals in the test.
The utility model adopts the absorber to replace the resistor in order to reduce the production cost of the load, so that the finally obtained load is obviously different from the traditional calibration load, but the defect is obvious, the absorber adopts ferrite, the material has good absorption effect on high-frequency signals, and can realize the calibration in the millimeter wave frequency band, but can only be applied to the millimeter wave frequency band in actual use, and cannot be commonly used in a plurality of frequency bands such as 3G, 6G, 9G, 26.5G and the like other calibration loads.
In addition to the two less common calibration load configurations described above, there are also relatively more common calibration load configurations that employ a sheet load, such calibration loads typically comprising: the device comprises a shell, a central needle, a spring, a chip resistor and a supporting medium, wherein the shell plays a physical protection and shielding role, the central needle is a connecting piece for transmitting signals sent by a network analyzer to the spring and the chip resistor, and the supporting medium is used for fixing the chip resistor; since the center pin is cylindrical and the chip resistor is chip-shaped, a spring is provided between the center pin and the chip resistor in order to ensure that the electrical contact between the center pin and the chip resistor is tight and reliable. However, although the spring can ensure relatively good electrical contact and connection stability between the center pin and the chip resistor, problems are caused, including: in the case of frequent connection and disconnection of the spring, the elasticity of the spring gradually weakens, which leads to unstable electrical contact or signal reflection; meanwhile, the spring can generate certain resistance and inductance under high frequency, so that attenuation and phase shift are generated on signals; moreover, the elasticity and conductivity of the spring are also affected by temperature variations, thereby affecting the performance of the load.
It follows that the prior art is still to be improved and perfected.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present utility model aims to provide a network division calibration load and calibration piece for a wireless communication network, which aims to solve the problems that the existing calibration load is either high in cost or poor in universality or is easily damaged by performance caused by spring state.
The technical scheme of the utility model is as follows:
a network division calibration load for a wireless communication network, comprising: the device comprises a central needle, a columnar resistor and a horn button, wherein the columnar resistor is inserted into one end of the central needle, which is used for deviating from a network analyzer, the horn button is arranged at the outer edge of the columnar resistor, a horn mouth is formed in the inner side of the horn button, a first end with a larger diameter of the horn mouth faces the central needle, and a second end with a smaller diameter is attached to the columnar resistor; the impedance value of the columnar resistor at the first end of the horn mouth is 50 ohms, the impedance value of the columnar resistor between the first end and the second end of the horn button is gradually reduced, and the impedance value at the second end of the horn mouth is 0.
The effect of above-mentioned scheme lies in: the impedance value of the columnar resistor at the first end of the horn mouth is 50 ohms, and the impedance value at the port of the network analyzer is also 50 ohms, so that the columnar resistor and the network analyzer have good impedance matching, and when a signal sent by the network analyzer propagates to the place, the columnar resistor can be well absorbed without reflection, and the transmission quality of the signal is ensured; then, along with the reduction of the diameter of the horn mouth, the impedance value of the columnar resistor is gradually reduced, so that the signal can smoothly adapt to the change of the impedance, the reflection and distortion of the signal in the transition section are reduced, and the stability and reliability of signal transmission are improved; in addition, since the impedance value of the columnar resistor at the second end of the horn mouth is 0, which is equivalent to a short circuit, the signal is directly grounded at the second end, the signal is completely absorbed (consumed in a load), the signal is ensured not to be reflected, particularly in high frequency and millimeter wave frequency bands, the signal source is very sensitive to the reflected signal, and if the signal is reflected, the measurement precision of the network analyzer is greatly reduced.
In addition, as the columnar resistor is inserted into the central needle, the connection stability between the columnar resistor and the central needle is improved, and a part of the load is inserted into the central needle, so that the overall length of the load is reduced, the signal transmission path is shortened, the loss in the signal transmission process is reduced, and the signal transmission efficiency is improved; in addition, the connection compactness of the columnar resistor and the center pin is higher, so that signals are not easy to reflect in the transmission process, the transmission stability of the signals is improved, the reflection loss in the signal transmission process is reduced, the interference and noise in the signal transmission process are also reduced, and the accuracy and reliability of measurement are improved; compared with a loading structure using a chip resistor, the spring is prevented from being used, and defects caused by the spring are avoided.
In a further preferred embodiment, the inner diameter of the first end port of the bell mouth is calculated according to the formula d=2sqrt (z×d/epsilon), where D is the inner diameter of the first end port of the bell mouth, Z is the characteristic impedance of the columnar resistor at the first end port of the bell mouth, and the value is 50 ohms; d is the outer diameter of the columnar resistor and epsilon is the dielectric constant of air, which is about 1.00053.
The effect of above-mentioned scheme lies in: the internal diameter D of the first end port of the horn mouth can be calculated through the formula, so that the design parameters of the horn mouth are determined, the matching of the horn mouth and the columnar resistor is ensured, the impedance matching in the signal transmission process is optimized, the reflection and the loss of the signal are reduced, and the performance and the stability of the network calibration load are improved; by using the calculation method, the size of the horn mouth can be accurately determined according to specific design requirements and parameters so as to meet the network division calibration requirement of a wireless communication network.
In a further preferred embodiment, the network division calibration load for a wireless communication network further comprises: the device comprises a buckle body fixing ring and a fixing threaded piece, wherein one end of the buckle body fixing ring is attached to one end of the horn buckle, which is away from the central needle, and is used for propping the horn buckle, and the middle part of the buckle body fixing ring is provided with a threaded hole; and the fixed screw thread piece passes through the threaded hole and then props against the columnar resistor.
The effect of above-mentioned scheme lies in: the utility model separately sets the buckle body fixing ring and the fixing screw part, on one hand, the utility model aims to prevent the post resistor and the horn buckle from being uneven on the end face of the rear end due to processing errors and/or assembly errors, thereby avoiding the problem of shaking after assembly, greatly improving the fixing stability and reliability of the post resistor and the fixing screw part, further improving the signal transmission quality and reducing the distortion and interference possibly generated in the signal transmission; on the other hand, in order to enable the front and back positions of the columnar resistor relative to the center pin and the fixed threaded piece to be adjustable in a certain range, the requirement of the calibration load on the machining precision is reduced, and the yield of the calibration load can be optimized by adjusting the position of the fixed threaded piece relative to the buckle body fixed ring, so that the dependence of the precision devices such as the calibration load on the high machining precision is reduced, and the optimization measure has higher flexibility and controllability than the high machining precision in the production process, improves the production efficiency, and reduces the production cost. In addition, the utility model also utilizes the characteristic that the horn button and the button body fixing ring are both annular (the horn button is sleeved on the outer edge of the columnar resistor, so the tail end of the horn button is annular, and the middle part of the button body fixing ring is provided with a hole for allowing the fixing screw to pass through, so the horn button is annular, so the horn button can be effectively supported by the button body fixing ring, and the position and the shape configuration of each part are optimally configured.
In a further preferred scheme, one end of the horn button, which is away from the center needle, is extended to form a fixing ring, and the inner wall of the fixing ring is attached to the outer edge of the columnar resistor.
The effect of above-mentioned scheme lies in: through the setting of solid fixed ring, the loudspeaker knot can be held and press from both sides tight columnar resistance effectively: the inner wall of the fixing ring is attached to the outer edge of the columnar resistor to form a tight attaching structure, so that the columnar resistor is ensured to be relatively fixed in position in the horn button, and the situation of shaking or loosening is not easy to occur; meanwhile, the contact area between the columnar resistor and the horn button is increased by the extension of the fixing ring, the connection stability between the columnar resistor and the horn button is further enhanced, the good connection state of all parts of the calibration load in the use process is effectively ensured, the connection looseness or failure caused by processing errors, assembly errors or vibration and other reasons is avoided, the performance stability of the calibration load is improved, the reliability and the accuracy in the signal transmission process are ensured, and therefore the wireless communication network working environment is better adapted.
In a further preferred scheme, the middle outer edge of the center pin is provided with a fixed groove, the net division calibration load for the wireless communication network is further provided with an insulator, and the insulator is sleeved on the outer edge of the fixed groove.
The effect of above-mentioned scheme lies in: the insulator is a part with insulating property, is used for isolating a circuit between the central needle and other metal parts, prevents short circuit or other interference from occurring on current, and can reduce current loss and interference in signal transmission as an electrical isolation device, thereby improving signal transmission quality and accuracy of a calibration load.
In a further preferred aspect, the network division calibration load for a wireless communication network further includes: the insulator comprises a first bushing and a front shell, wherein a clearance groove with the same width as the insulator is formed in the inner side of the first end of the first bushing, the end face of the first end is propped against the front shell, and the outer edge of the insulator is accommodated in the clearance groove.
The effect of above-mentioned scheme lies in: the width of the first clearance groove is the same as that of the insulator, the outer edge of the insulator is accommodated in the clearance groove, and a tight matching relation is formed among the first bushing, the front shell and the insulator, so that the insulator is clamped at the clearance groove, displacement or shaking cannot be generated in the working process, a good signal transmission state is maintained, and the stability and reliability of signal transmission are improved; the second insulator is used as a dielectric body, the dielectric constant of the second insulator is larger than that of air, the propagation speed of signals in the insulator can be influenced, the volume of the insulator is effectively increased by arranging the fixing groove and the clearance groove, the influence on the signal transmission quality due to the fact that the dielectric constant of the insulator is larger is reduced, the propagation loss of signals in the insulator is reduced, and the signal transmission performance is improved.
In a further preferred aspect, the network division calibration load for a wireless communication network further includes: the front part of the inner wall of the second lining is attached to the outer edge of the first lining, the middle part of the inner wall of the second lining is attached to the outer edge of the horn button, and the rear part of the inner wall of the second lining is attached to the outer edge of the button body fixing ring.
The effect of above-mentioned scheme lies in: the arrangement of the second bushing reduces the assembly difficulty of the calibration load, so that the relative positions of the first bushing, the horn button and the button body fixing ring are easier to determine during assembly, and the assembly efficiency and the yield are improved; simultaneously, the inner wall laminating of second bush is in the outer fringe of first bush, and the middle part laminating is in the outer fringe of loudspeaker knot, and the rear portion laminating is in the outer fringe of detaining the body solid fixed ring, has increased the area of contact between first bush, loudspeaker knot and detaining body solid fixed ring and the second bush, has improved fixed stability, also makes first bush, loudspeaker knot and detaining body solid fixed ring obtain effectual support, prevents that they from taking place relative displacement, has ensured that the sideslip can not take place for three relative position, has improved load structure's whole fastness and signal transmission stability.
In a further preferred aspect, the network division calibration load for a wireless communication network further includes: the rear shell is used for facing the middle part of one end of the buckle body fixing ring and is provided with a containing cavity, the side wall of the containing cavity is connected with the second bushing in a threaded manner, and the buckle body fixing ring and the fixing threaded piece are contained in the containing cavity.
The effect of above-mentioned scheme lies in: the rear shell is used as a shell structure to play a role in fixing and protecting key parts in the load, such as a second bushing, a buckle body fixing ring and a fixing screw member, particularly a buckle body fixing ring and a fixing screw member, which respectively support a horn buckle and a columnar resistor, and once any one of the two is impacted to change the position, the signal transmission of the whole calibration load is influenced, so that the arrangement of the rear shell avoids the damage or loosening of the parts due to external force or misoperation; meanwhile, the existence of the rear shell provides additional protection for the load, and parts can be effectively prevented from being influenced by external environments, such as dust, moisture and the like, so that the durability and the reliability of the load are improved.
In a further preferred embodiment, the second bushing has a front end connected to the front shell and a rear end connected to the rear shell.
The effect of above-mentioned scheme lies in: the front ends of the first and second bushings are connected with the front shell, the rear ends of the first and second bushings are connected with the rear shell, so that a stable frame structure is formed, the second bushings can be stably fixed in the front and rear shells in a connecting mode, loosening and relative movement of parts are effectively prevented, and the stability of the whole load structure is enhanced; the second bushing and the second bushing play a role in positioning between the front shell and the rear shell, so that the positions of all parts are relatively fixed, which is very important for the stability of a load and the accuracy of signal transmission, because the position fixing of the parts can reduce distortion and interference in the signal transmission process and improve the quality and accuracy of signal transmission; the design that the third and second bushings are connected with the front shell and the rear shell enables the assembly process of the load to be more convenient, parts can be fixed on the second bushings first, then the whole second bushing is connected with the front shell and the rear shell, assembly steps are simplified, and assembly efficiency and convenience are improved; fourth, because the second bush is connected in preceding shell and backshell for preceding shell, second bush and backshell have formed a semi-closed structure, have formed a totally enclosed structure after the calibration load is connected in the network analyzer more, have played the guard action to spare part, can prevent effectively that spare part from receiving external environment's influence like dust, moisture etc. to the overall durability and the reliability of load have been improved.
In a further preferred scheme, the outer edge of the front shell is provided with a limiting protrusion, and is sleeved with a locking nut, and the locking nut can move back and forth within a preset range and is used for being connected with a network analyzer in a threaded mode.
The effect of above-mentioned scheme lies in: through the combined design of the limiting bulge and the movable lock nut, the lock nut can be accurately positioned within a preset range, so that the connection between the load structure and the network analyzer is ensured to be very stable and accurate, and the problems of unstable connection or position deviation are avoided; meanwhile, before the locking nut is connected to the network analyzer, the locking nut can be moved towards the direction away from the network analyzer, so that the assembly difficulty caused by over-positioning is prevented from being improved, collision damage to the center needle is possibly caused, after the center needle and the front shell are positioned with the network analyzer, the locking nut can be moved towards the direction close to the network analyzer, and then the connection is rapidly completed by rotating the locking nut; in addition, in the use process, if the relative position of the calibration load and the network analyzer needs to be finely adjusted, the adjustment can be completed by loosening the lock nut, moving the lock nut back and forth and then locking again.
A calibration piece comprising a network split calibration load for a wireless communications network as described above. The calibration piece includes all technical features of the above-mentioned network calibration load for a wireless communication network, so that it also includes all technical effects of the above-mentioned network calibration load for a wireless communication network, and will not be described again.
Compared with the prior art, the network division calibration load for the wireless communication network, provided by the utility model, has the advantages that the impedance value of the columnar resistor at the first end of the horn mouth is set to be 50 ohms and is matched with the port of the network analyzer, so that signals are smoothly absorbed without reflection, and the transmission quality is ensured; the columnar resistance impedance is gradually reduced by gradually reducing the diameter of the horn mouth, so that reflection and distortion are reduced, and the transmission stability is improved; by setting the columnar resistance of the horn mouth second end to 0, the signal is ensured to be completely absorbed at the second end, and reflection errors are avoided; in addition, the columnar resistor is inserted into the central needle, so that the connection stability is enhanced, the space is saved, meanwhile, the loss and reflection in the signal transmission process are reduced by utilizing the tight connection between the columnar resistor and the central needle, and the efficiency and the accuracy are improved; the spring is avoided, and the structure is simplified while the problems brought by the spring are avoided.
Drawings
Fig. 1 is a schematic structural diagram of a 3.5mm microwave coaxial matching load published by 200920255147X.
Fig. 2 is a schematic structural diagram of a millimeter wave calibration load disclosed in 2020210517424.
Fig. 3 is a schematic diagram of the structure of a network division calibration load for a wireless communication network in the present utility model.
Fig. 4 is a schematic diagram of the structure of the first view angle of the horn button for the network calibration load of the wireless communication network according to the present utility model.
Fig. 5 is a schematic diagram of a second view of a horn button for a network calibration load for a wireless communication network according to the present utility model.
Description of the embodiments
The utility model provides a network division calibration load and a calibration piece for a wireless communication network, which are used for making the purposes, technical schemes and effects of the utility model clearer and more definite, and the utility model is further described in detail below by referring to the accompanying drawings and examples.
The present utility model provides a network division calibration load for a wireless communication network, as shown in fig. 3, comprising: center needle 1, column resistance 2 and horn button 3.
The center needle 1 is positioned at the center of the calibration load and is used for being connected with the network analyzer; by connecting the centre pin 1 and the test equipment, the calibration load can receive and process signals emanating from the test equipment, so that the calibration load can accommodate signal transmissions of different frequencies and powers.
The columnar resistor 2, which is an important component of the calibration load and is inserted into one end of the center pin 1, is indirectly connected with the network analyzer. It should be noted that, the design of the impedance value of the columnar resistor 2 is very critical to signal transmission, in the present utility model, the impedance value of the columnar resistor 2 at the first end of the bell mouth (31, 32, 33), i.e. the position 31 shown in fig. 4, is set to be 50 ohms, so as to match with the impedance value of the output port of the network analyzer, and realize impedance matching; during signal transmission, impedance matching is very important, and ensures that the signal transmits energy to the greatest extent during transmission, and reflection and signal loss are avoided; if the impedance match is not good, the signal may be reflected back to the network analyzer, thereby causing instability and distortion in signal transmission.
The horn button 3 is a unique device of the utility model, is arranged on the outer edge of the columnar resistor 2, is provided with a horn mouth on the inner side and takes the shape of horns with different diameters at the two ends, namely, the middle is a transition section with smooth transition, namely, the position 32 shown in fig. 4; the first end with larger inner diameter of the horn mouth faces the central needle 1, and the second end with smaller inner diameter is attached to the columnar resistor 2; the design of the horn button 3 enables the signal to be smoothly transited in the transmission process, so that the smooth transition of the signal is realized, the reflection and the distortion of the signal in the transition section are effectively reduced, and the stability and the reliability of the signal transmission are improved.
The impedance value at the second end of the horn mouth, namely at the position 33 shown in fig. 4, is 0 ohm, which is equivalent to a short circuit, so that the signal is directly grounded at the second end, and the signal is completely absorbed, thereby ensuring that the signal is not reflected; this is particularly important in the high frequency and millimeter wave bands because the signal source is very sensitive to reflected signals, which if reflected, would reduce the measurement accuracy of the test equipment.
In a specific implementation, the inner diameter of the first end port of the bell mouth is calculated according to a formula d=2jsqrt (z×d/epsilon), where D is the inner diameter of the first end port of the bell mouth, Z is the characteristic impedance of the columnar resistor 2 at the first end port of the bell mouth, and the value is 50 ohms; d is the outer diameter of the columnar resistor 2, epsilon is the dielectric constant of air, and is about 1.00053.
Substituting the known parameters into the above formula (assuming d=3.06 mm):
D=2*sqrt（50*3.06/1.00053）≈6.94mm。
the angle and the length of the transition section are designed through electromagnetic field simulation, and the specific implementation steps are as follows:
using electromagnetic field simulation software (such as HFSS, CST, etc.) to build a three-dimensional simulation model according to the geometry and material characteristics of the calibration load;
defining proper boundary conditions for the established three-dimensional simulation model, including power supply signal frequency, port impedance, signal propagation direction and the like;
running simulation, observing propagation and reflection conditions of signals in a transition section, and recording parameters such as S parameters (scattering parameters) and impedance matching conditions;
according to the simulation result, the angle and the length of the transition section are adjusted, the simulation is rerun, and the transmission quality and the matching condition of the signals are continuously observed;
according to the continuously optimized simulation result, repeatedly adjusting and simulating until the optimal design parameters are found, so that the signal is smoothly transmitted in the transition section, and reflection and loss are reduced;
the optimal design parameters are applied to the manufacture of the actual calibration load, and the actual test and verification are performed to ensure that the optimal design parameters meet the requirements of the wireless communication network.
In a further preferred embodiment of the present utility model, the network division calibration load for a wireless communication network further comprises: the buckle body fixing ring 4 and the fixing screw member.
The buckle body fixing ring 4 is an annular part, one end of the buckle body fixing ring is attached to one end of the horn buckle 3, which is away from the central needle 1, and is used for propping the horn buckle 3, so that the connection stability between the horn buckle 3 and the central needle 1 is ensured; the middle part is provided with a threaded hole for installing and fixing a threaded piece.
The fixing screw member is a part with threads, and the fixing screw member penetrates through the threaded hole of the buckle body fixing ring 4 to prop against the columnar resistor 2, so as to fix the columnar resistor 2, and the fixing screw member is designed to be matched with the threaded hole of the buckle body fixing ring 4, so that the columnar resistor 2 is firmly connected.
It will be appreciated that the design of the clasp body retaining ring 4 and the retaining screw may be adapted to specific requirements, for example, the shape and materials of the clasp body retaining ring 4 may be optimized to improve stability and durability of the fixation; the length, thread specification and material of the fixing screw can be selected according to the actual situation so as to meet specific installation requirements and mechanical properties.
In addition, the addition of shims or spring washers at the holding portion of the fixture screw may be considered to provide better cushioning and stability. In addition, other methods of fastening the screw member may be used, such as the threaded lock nut 10 or the quick-connect device, which is not particularly limited in the present utility model.
Further, a fixing ring 34 (as shown in fig. 5) extends from one end of the horn button 3 away from the central needle 1, and an inner wall of the fixing ring is attached to an outer edge of the columnar resistor 2. That is, the fixing ring is a part extending from one end of the horn button 3, the inner wall is attached to the outer edge of the columnar resistor 2, so that stable support is provided, the columnar resistor 2 can be fixed inside the horn button 3, and the connection stability of the calibration load is ensured. The shape and size of the fixing ring can be optimally designed according to practical requirements, for example, the inner wall of the fixing ring can be made of special shape or material, so that a better fixing effect is provided, and stable connection of the columnar resistor 2 is ensured. While the rubber gasket or buffer material can be added on the inner wall or the outer wall of the fixed ring to provide better buffer and shock resistance; in addition, other methods of connecting the fixing ring, such as the threaded lock nut 10 or the spring clamping device, can be used, which is not particularly limited in the present utility model.
Preferably, a fixed slot is formed in the outer edge of the middle part of the center needle 1, an insulator 5 is further arranged on the net division calibration load for the wireless communication network, and the insulator 5 is sleeved on the outer edge of the fixed slot. The insulator 5 is used for isolating the central needle 1 and other parts, so that the problems of signal leakage, short circuit and the like are avoided, and the insulator can be made of polytetrafluoroethylene; the fixing groove is used for accommodating the inner edge part of the insulator 5, so that the relative position of the insulator 5 and the center pin 1 is ensured not to change.
In specific implementation, the design shape and size of the fixing groove can be optimized according to the shape and size of the insulator 5; for example, the fixing groove may be adjusted according to the diameter and length of the insulator 5 to ensure that the insulator 5 can be stably fitted in the fixing groove. A layer of coating or cladding material may be added to the outer surface or the inside of the insulator 5 to enhance the insulating properties of the insulator 5. In addition, a layer of gasket or filler can be added in the fixing groove to provide better fixing effect of the insulator 5. The specific design can be adaptively adjusted and selected by those skilled in the art based on the disclosure of the present utility model, and the obtained technical scheme shall also belong to the protection scope of the present utility model, and the possible schemes are not listed one by one.
Preferably, the network division calibration load for a wireless communication network further comprises: the insulator comprises a first bushing 6 and a front shell 8, wherein a clearance groove with the same width as the insulator 5 is formed in the inner side of the first end of the first bushing 6, the end face of the first end is propped against the front shell 8, and the outer edge of the insulator 5 is accommodated in the clearance groove.
The first bush 6 is a part of the calibration load, and is provided on its inner side with a clearance groove having the same width as the insulator 5 in order to accommodate the outer edge of the insulator 5 so as to be fixed inside the first bush 6. The front shell 8 is another part of the calibration load, the top of which is connected to the first end face of the first bushing 6, and serves to fix and protect the internal components of the calibration load, while ensuring that the insulator 5 is firmly fixed in the first bushing 6.
In specific implementation, the design shape and size of the clearance groove can be optimized according to the shape and size of the insulator 5; for example, the clearance groove may be adjusted according to the width and thickness of the insulator 5 to ensure that the insulator 5 can be completely accommodated in the clearance groove, thereby enhancing the fixing effect thereof.
Further, the network division calibration load for a wireless communication network further includes: and the front part of the inner wall of the second bushing 7 is attached to the outer edge of the first bushing 6, the middle part of the inner wall of the second bushing 7 is attached to the outer edge of the horn button 3, and the rear part of the inner wall of the second bushing 7 is attached to the outer edge of the button body fixing ring 4.
The second lining 7 is another part of the calibration load, the front part of the inner wall of the second lining is jointed with the outer edge of the first lining 6, the middle part of the second lining is jointed with the outer edge of the horn button 3, and the rear part of the second lining is jointed with the outer edge of the button body fixing ring 4; the design of the second bushing 7 is intended to ensure stability of the first bushing 6, the horn clasp 3 and the clasp body securing ring 4 and to provide additional support thereto, as described in detail below:
the front part of the second bushing 7 is jointed with the outer edge of the first bushing 6 to keep the tight connection between the first bushing 6 and the second bushing 7, so as to ensure the structural stability of the whole calibration load;
the middle part of the second bushing 7 is attached to the outer edge of the horn button 3, so that the support required by the horn button 3 is provided, and the horn button is prevented from shaking or loosening, so that the stability of signal transmission is ensured;
the rear part of the second bushing 7 is attached to the outer edge of the buckle body fixing ring 4 to provide additional support for the buckle body fixing ring 4, prevent loosening or displacement of the buckle body fixing ring 4 and ensure the structural stability of the calibration load;
meanwhile, the arrangement of the second bushing 7 can improve the accuracy of the relative positions of the first bushing 6, the horn button 3 and the button body fixing ring 4 in the assembly process, so that the assembly yield and the assembly efficiency are improved.
Preferably, the network division calibration load for a wireless communication network further comprises: the rear shell 9, the middle part that the rear shell 9 is used for facing detaining body fixation ring 4 one end has seted up and has acceptd the chamber, the lateral wall threaded connection who accepts the chamber in second bush 7, detain body fixation ring 4 and fixed screw spare are acceptd in acceptment the intracavity.
The rear shell 9 is a part of a calibration load and is used for accommodating the buckle body fixing ring 4 and the fixing screw member, and is provided with an open accommodating cavity, the accommodating cavity is positioned at the middle position facing one end of the buckle body fixing ring 4, threads are usually arranged on the side wall of the accommodating cavity and are used for being connected with the second bushing 7, the second bushing 7 is fixed in the accommodating cavity, and the second bushing 7 can be firmly fixed on the side wall of the accommodating cavity through threaded connection, so that the connection stability of the second bushing 7 and the rear shell 9 is ensured, and the second bushing 7 is prevented from loosening or displacement.
Preferably, as shown in fig. 3, the second bushing 7 has a front end connected to the front case 8 and a rear end connected to the rear case 9.
It can be seen that in the calibration load provided by the utility model, the positions and the connection relations of the parts are annular and mutually buckled, so that the calibration load obtained by assembly forms a complete whole, and the calibration load is concretely as follows:
the radial position of the central needle is limited and locked by the insulator, and the axial position is locked by the insertion of the columnar resistor;
the radial position of the columnar resistor is limited and locked by the horn button, and the axial position is propped by the fixed screw;
the radial position of the insulator is locked by the first bushing and the central needle, and the axial position is clamped by the first bushing and the front shell;
the radial positions of the first bushing, the horn button and the button body fixing ring are limited by the second bushing;
the axial position of the first bushing is propped up by the horn button (as shown in the figure), the axial position of the horn button is propped up by the button body fixing ring, and the axial position of the button body fixing ring is locked due to threaded connection with the second bushing (as shown in the figure);
the positions of the front shell and the rear shell are locked by threaded connection with the front end and the rear end of the second bushing respectively.
It is easy to understand that the radial and axial positions of each part are limited and locked, so that each part of the calibration load is ensured not to be loosened or displaced in the assembly process, and the stability and reliability of the whole calibration load are improved; in addition, the radial and axial positions of the calibration load center pin 1 and the insulator 5 are locked, and the radial positions of the horn button 3 and the columnar resistor 2 are locked, so that the stable connection between the center pin 1 and the insulator 5 and the connection between the horn button 3 and the columnar resistor 2 are ensured, and the signal transmission quality problem caused by unstable connection is avoided; meanwhile, the radial position of the insulator 5 is locked by the first bushing 6 and the center pin 1, so that good insulation performance between the insulator 5 and the center pin 1 is ensured, and interference or loss caused by poor insulation in the signal transmission process can be prevented; moreover, the design and the fixing mode of each part are matched with each other, so that the assembly process of the calibration load is simpler, more convenient and more efficient, and the production efficiency is improved; in addition, the mode that each part is mutually nested and connected in a threaded mode is adopted, so that the whole structure of the calibration load is compact, and the occupied space is small.
According to another aspect of the present utility model, the outer edge of the front shell 8 is provided with a limiting protrusion, and is sleeved with a lock nut 10, wherein the lock nut 10 can move back and forth within a preset range, and is used for being connected to a network analyzer in a threaded manner.
According to the utility model, through the combined design of the limiting protrusion and the movable lock nut 10, the lock nut 10 can be accurately positioned within a preset range, so that the connection between a load structure and a network analyzer is ensured to be very stable and accurate, and the problem of unstable connection or position deviation is avoided; meanwhile, before the lock nut 10 is connected to the network analyzer, the lock nut 10 can be moved towards the direction away from the network analyzer, so that the assembly difficulty caused by over-positioning is prevented from being increased, and collision damage to the center needle 1 is possibly caused; in addition, in the use process, if the relative position of the calibration load and the network analyzer needs to be finely adjusted, the adjustment can be completed by loosening the lock nut 10, moving the lock nut 10 back and forth and then re-locking.
The utility model also provides a calibration piece comprising a network division calibration load for a wireless communication network as described above. The calibration piece includes all technical features of the above-mentioned network calibration load for a wireless communication network, so that it also includes all technical effects of the above-mentioned network calibration load for a wireless communication network, and will not be described again.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the utility model and form different embodiments; for example, any of the claimed embodiments can be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the utility model, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The utility model may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specifically stated.
Claims (9)
1. A network division calibration load for a wireless communication network, comprising: the center needle, its characterized in that still includes: the columnar resistor is inserted into one end of the central needle, which is used for deviating from the network analyzer, and the horn button is arranged at the outer edge of the columnar resistor, a horn mouth is formed in the inner side of the columnar resistor, a first end with a larger diameter of the horn mouth faces the central needle, and a second end with a smaller diameter is attached to the columnar resistor; the impedance value of the columnar resistor at the first end of the horn mouth is 50 ohms, the impedance value of the columnar resistor between the first end and the second end of the horn button is gradually reduced, and the impedance value at the second end of the horn mouth is 0;
the inner diameter of the first end port of the horn mouth is calculated according to a formula d=2×sqrt (z×d/epsilon), wherein D is the inner diameter of the first end port of the horn mouth, Z is the characteristic impedance of the columnar resistor at the first end port of the horn mouth, and the value is 50 ohms; d is the outer diameter of the columnar resistor, ε is the dielectric constant of air, which is about 1.00053;
the angle and the length of the transition section are designed through electromagnetic field simulation, and the specific implementation steps are as follows:
establishing a three-dimensional simulation model according to the geometric structure and material characteristics of the calibration load by using electromagnetic field simulation software;
defining boundary conditions for the established three-dimensional simulation model, wherein the boundary conditions comprise power supply signal frequency, port impedance and signal propagation direction;
running simulation, observing propagation and reflection conditions of signals in the transition section, and recording S parameters and impedance matching conditions;
according to the simulation result, the angle and the length of the transition section are adjusted, the simulation is rerun, and the transmission quality and the matching condition of the signals are continuously observed;
according to the continuously optimized simulation result, repeatedly adjusting and simulating until the optimal design parameters are found, so that the signal is smoothly transmitted in the transition section, and reflection and loss are reduced;
the optimal design parameters are applied to the manufacture of the actual calibration load, and the actual test and verification are performed to ensure that the optimal design parameters meet the requirements of the wireless communication network.
2. The network division calibration load for a wireless communication network according to claim 1, further comprising: the device comprises a buckle body fixing ring and a fixing threaded piece, wherein one end of the buckle body fixing ring is attached to one end of the horn buckle, which is away from the central needle, and is used for propping the horn buckle, and the middle part of the buckle body fixing ring is provided with a threaded hole; and the fixed screw thread piece passes through the threaded hole and then props against the columnar resistor.
3. The network split calibration load for a wireless communication network of claim 2, wherein a retaining ring extends from an end of the horn button facing away from the center pin, and an inner wall of the retaining ring engages an outer edge of the columnar resistor.
4. A net-division calibrating load for a wireless communication network according to claim 3, wherein the central needle is provided with a fixing groove at the outer edge thereof, and an insulator is further provided at the outer edge thereof, and the insulator is sleeved on the outer edge thereof.
5. The network division calibration load for a wireless communication network according to claim 4, further comprising: the insulator comprises a first bushing and a front shell, wherein a clearance groove with the same width as the insulator is formed in the inner side of the first end of the first bushing, the end face of the first end is propped against the front shell, and the outer edge of the insulator is accommodated in the clearance groove.
6. The network division calibration load for a wireless communication network according to claim 5, further comprising: the front part of the inner wall of the second lining is attached to the outer edge of the first lining, the middle part of the inner wall of the second lining is attached to the outer edge of the horn button, and the rear part of the inner wall of the second lining is attached to the outer edge of the button body fixing ring.
7. The network division calibration load for a wireless communication network according to claim 6, further comprising: the rear shell is used for facing the middle part of one end of the buckle body fixing ring and is provided with a containing cavity, the side wall of the containing cavity is connected with the second bushing in a threaded manner, and the buckle body fixing ring and the fixing threaded piece are contained in the containing cavity.
8. The net-split calibration load for a wireless communication network as defined in claim 7, wherein the second bushing is connected at a front end to the front shell and at a rear end to the rear shell.
9. A calibration part comprising a network division calibration load for a wireless communication network according to any one of claims 1 to 8.
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| CN202311088570.6A CN116826337B (en) | 2023-08-28 | 2023-08-28 | Network division calibration load and calibration piece for wireless communication network |
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| CN202311088570.6A CN116826337B (en) | 2023-08-28 | 2023-08-28 | Network division calibration load and calibration piece for wireless communication network |
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| CN116826337B true CN116826337B (en) | 2023-11-10 |
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| CN106970344A (en) * | 2017-03-24 | 2017-07-21 | 西安科技大学 | A kind of method for reducing open circuit device calibrating device edge capacitance and open circuit device calibrating device |
| CN114334306A (en) * | 2020-10-09 | 2022-04-12 | 西安西电高压开关有限责任公司 | Insulator assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7982480B2 (en) * | 2008-08-01 | 2011-07-19 | Aes Technologies, Inc. | Calibrated wideband high frequency passive impedance probe |
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| US2968774A (en) * | 1956-10-22 | 1961-01-17 | Empire Devices Inc | Microwave attenuation units |
| EP0023437A1 (en) * | 1979-07-27 | 1981-02-04 | The Bendix Corporation | Radio frequency load resistor |
| CN201285788Y (en) * | 2008-10-20 | 2009-08-05 | 安费诺科耐特(西安)科技有限公司 | Radio frequency coaxial load with band expanding function |
| CN101916900A (en) * | 2010-07-30 | 2010-12-15 | 合肥佰特微波技术有限公司 | Pellet resistor with multi-cascade attenuator circuit |
| CN103490129A (en) * | 2013-10-10 | 2014-01-01 | 苏州华旃航天电器有限公司 | SMP-series radio frequency coaxial load structure |
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| CN114334306A (en) * | 2020-10-09 | 2022-04-12 | 西安西电高压开关有限责任公司 | Insulator assembly |
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| CN116826337A (en) | 2023-09-29 |
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