CN218567479U - Filter insertion loss test tool and test system - Google Patents
Filter insertion loss test tool and test system Download PDFInfo
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- CN218567479U CN218567479U CN202221676702.8U CN202221676702U CN218567479U CN 218567479 U CN218567479 U CN 218567479U CN 202221676702 U CN202221676702 U CN 202221676702U CN 218567479 U CN218567479 U CN 218567479U
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Abstract
The utility model relates to a wave filter insertion loss test fixture and test system. The filter insertion loss testing tool comprises a metal shielding box, two input adapters and two output adapters; the metal shielding box is used for being placed on the grounding plate, and an accommodating space for accommodating the filter is formed in the metal shielding box; the input adapter penetrates through the first side wall of the metal shielding box; the output adapter is arranged on the second side wall of the metal shielding box in a penetrating mode, and the input adapter corresponds to the output adapter one to one. This wave filter insertion loss test fixture is through setting up two input adapter and two output adapter, can realize the test of common mode insertion loss and differential mode insertion loss simultaneously, and conveniently changes common mode, differential mode insertion loss test circuit, easy operation.
Description
Technical Field
The utility model relates to a wave filter test technical field especially relates to wave filter insertion loss test fixture and test system.
Background
In recent years, with the development of electronic devices, electromagnetic interference has become a serious public nuisance, which not only affects the normal operation of the devices, but also endangers the safety of people. Filters are generated to suppress electromagnetic interference, and are the most powerful means for suppressing electromagnetic interference.
An EMI (Electromagnetic Interference) filter generally includes a capacitor, an inductor, and a resistor, and is mainly used to filter Electromagnetic Interference outside an operating frequency in a power line, so as to suppress unwanted signals generated by a device itself and resist Interference signals coupled into the device through the power line from the outside. In the field of electromagnetic compatibility, the EMI filter plays an extremely important role, so the EMI filter is widely applied to various fields such as airplanes, rockets, ships, submarines, ground vehicles and the like. The interference signal has two modes of differential mode and common mode, and the power supply filter can play a good role in attenuating the two kinds of interference.
The main technical index for measuring the performance of the power filter is the high-frequency parameter, namely the insertion loss, and the accurate test of the insertion loss of the power filter becomes particularly important. The insertion loss is further classified into a common mode insertion loss and a differential mode insertion loss. In the actual test process of the insertion loss, different connection modes need to be switched for the common mode insertion loss and the differential mode insertion loss, so that the test operation is complex, and the working efficiency is low.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a filter insertion loss test tool and a test system for solving the problem of complicated test operation.
A filter insertion loss test fixture comprises:
the metal shielding box is used for being placed on the grounding plate, and an accommodating space for accommodating the filter is formed in the metal shielding box;
the input adapter is arranged on the first side wall of the metal shielding box in a penetrating mode, one end of the input adapter is used for being electrically connected with the input end of the filter, and the other end of the input adapter is used for being electrically connected with the output end of the signal source;
two output adapters, the output adapter wears to establish on the second lateral wall of metallic shield case, the one end of output adapter be used for with the output electricity of wave filter is connected, the other end of output adapter is used for being connected with the input electricity of receiver, the input adapter with the output adapter one-to-one.
The filter insertion loss test tool is used for testing the common mode insertion loss and the differential mode insertion loss of the filter. Since the filter is placed in the metal shielding box, the filter can be grounded by contacting with the bottom wall or the side wall of the metal shielding box, and at the same time, both the signal source and the receiver are grounded. When the common mode insertion loss tests, the same signal is input into two input ends of the filter, so that one end of the input adapter can be connected with one signal source only, the other end of the input adapter is connected with the two input ends of the filter respectively, then two output ends of the filter are connected with one end of the same output adapter, the other end of the output adapter is connected with the receiver, and therefore the circuit building of the common mode insertion loss is completed. When the differential mode insertion loss test, two inputs of the filter need to input different signals, therefore, the signal source is connected with one input end of the filter through one input adapter, the output end corresponding to the input end on the filter is connected with the receiver through one output adapter, then the grounded load resistor is connected with the other input end of the filter through the other input adapter, and the other output end on the filter is connected with the grounded load resistor through the other output adapter, thereby the circuit building of the differential mode insertion loss test is completed. Therefore, the filter insertion loss test tool can realize the test of the common-mode insertion loss and the differential-mode insertion loss at the same time by arranging the two input adapters and the two output adapters, is convenient for converting a common-mode insertion loss test circuit and a differential-mode insertion loss test circuit, and is simple to operate. Meanwhile, the filter is placed in the metal shielding box, so that external electromagnetic signals are shielded, the interference of the external electromagnetic signals on the test result is reduced to the maximum extent, the crosstalk of the electromagnetic signals of the input end of the receiver and the output end of the signal source can be shielded, the electromagnetic coupling between the input end and the output end is prevented from influencing the test result, and the accuracy of the insertion loss test is ensured.
In one embodiment, the metal shielding box comprises a box body and a box cover, the box body is internally provided with the accommodating space, the accommodating space is provided with an opening communicated with the outside, the box cover is used for sealing the opening, and the first side wall and the second side wall are arranged on the box body.
In one embodiment, the filter insertion loss test fixture further includes a first screw, the end face of the opening on the box body is a top face, an edge connecting portion is arranged on the top face along the circumferential direction of the box body, a plurality of first mounting holes are arranged on the edge connecting portion, a plurality of second mounting holes are arranged on the box cover, the first mounting holes correspond to the second mounting holes one to one, the end face of the box cover facing the box body is attached to the edge connecting portion, and the first screw penetrates through the first mounting holes and the second mounting holes, so that the edge connecting portion is connected with the box cover.
In one embodiment, a handle is arranged on the end face of the box cover, which faces away from the box body, the handle comprises a suction cup and a carrying part, the suction cup is arranged on the box cover, the carrying part is rotatably connected with the suction cup, and a rotating shaft of the carrying part, which rotates relative to the suction cup, is parallel to the box cover.
In one embodiment, the filter insertion loss test fixture further comprises a second screw, a plurality of third mounting holes are formed in the bottom wall of the metal shielding box, a plurality of fourth mounting holes are formed in the filter, and the second screw penetrates through the fourth mounting holes and the third mounting holes, so that the filter is connected with the bottom wall.
In one embodiment, a plurality of the third mounting holes are uniformly spaced along the length direction of the bottom wall to form a plurality of rows, and a plurality of the third mounting holes are uniformly spaced in each row.
In one embodiment, the filter insertion loss test fixture further comprises a third screw, a plurality of fifth mounting holes are formed in the bottom wall of the metal shielding box, a plurality of sixth mounting holes are formed in the ground plate, and the third screw penetrates through the fifth mounting holes and the sixth mounting holes, so that the metal shielding box is connected with the ground plate.
In one embodiment, the input adapter includes an N-type connector located in the accommodating space and an SMA-type connector located outside the accommodating space, the N-type connector and the SMA-type connector are coaxially connected, the N-type connector is used for being connected to the filter, and the SMA-type connector is used for being connected to the signal source;
and/or, output adapter is including being located N type connector in the accommodation space with be located SMA type connector outside the accommodation space, N type connector with SMA type connector coaxial coupling, N type connector be used for with the wave filter is connected, SMA type connector be used for with the receiver is connected.
In one embodiment, a flange is arranged on the first side wall, and the input adapter penetrates through the flange to be connected with the first side wall;
and/or a flange plate is arranged on the second side wall, and the output adapter penetrates through the flange plate to be connected with the second side wall;
and/or the first side wall and the second side wall are oppositely arranged.
The utility model provides a wave filter insertion loss test system, includes ground plate, signal source, receiver and wave filter insertion loss test fixture, the signal source the receiver with wave filter insertion loss test fixture all places on the ground plate, the output of signal source with the input adapter of wave filter insertion loss test fixture is connected, the input of receiver with the output adapter of wave filter insertion loss test fixture is connected.
The filter insertion loss test system is used for testing the common-mode insertion loss and the differential-mode insertion loss of the filter. Because the filter is placed in the metal shielding box, the signal source and the receiver are all placed on the grounding plate, the filter can be grounded by contacting with the bottom wall or the side wall of the metal shielding box, and the signal source and the receiver are both grounded. When common mode insertion loss tests, the same signal is input to two input ends of the filter, so that the same signal can be connected with one end of the input adapter by using only one signal source, the other end of the input adapter is connected with the two input ends of the filter respectively, then two output ends of the filter are connected with one end of the same output adapter, the other end of the output adapter is connected with a receiver, and therefore common mode insertion loss circuit building is completed. When the differential mode insertion loss test is carried out, different signals need to be input into two input ends of the filter, therefore, a signal source is connected with one input end of the filter through one input adapter, the output end, corresponding to the input end, of the filter is connected with the receiver through one output adapter, then the grounded load resistor is connected with the other input end of the filter through the other input adapter, and the other output end of the filter is connected with the grounded load resistor through the other output adapter, so that the circuit building of the differential mode insertion loss test is completed. Therefore, the filter insertion loss test tool can realize the test of the common-mode insertion loss and the differential-mode insertion loss simultaneously by arranging the two input adapters and the two output adapters, is convenient for converting a common-mode insertion loss test circuit and a differential-mode insertion loss test circuit, and is simple to operate. Meanwhile, the filter is placed in the metal shielding box, so that external electromagnetic signals are shielded, the interference of the external electromagnetic signals on the test result is reduced to the maximum extent, the crosstalk of the electromagnetic signals of the input end of the receiver and the output end of the signal source can be shielded, the electromagnetic coupling between the input end and the output end is prevented from influencing the test result, and the accuracy of the insertion loss test is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a filter insertion loss test fixture in an embodiment;
FIG. 2 is a block diagram of a filter insertion loss test system under common mode insertion loss test according to an embodiment;
fig. 3 is a schematic structural diagram of a filter insertion loss test system under a differential mode insertion loss test in an embodiment.
Reference numerals: 100. a filter insertion loss test system; 10. a filter insertion loss test tool; 11. A metal shielding case; 111. a box body; 112. a box cover; 113. a second mounting hole; 114. a third mounting hole; 115. A fifth mounting hole; 12. an input adapter; 13. an output adapter; 14. an edge connecting part; 15. a handle; 151. a suction cup; 152. a hand-held portion; 16. a flange plate; 20. a network analyzer; 30. a load resistance; 40. and a filter.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
Filter insertion loss test tool 10 and filter insertion loss test system 100 in some embodiments are described in detail below with reference to the figures.
As shown in fig. 1, fig. 2 and fig. 3, in one embodiment, there is provided a filter insertion loss test tool 10, where the filter insertion loss test tool 10 includes a metal shielding box 11, two input adapters 12 and two output adapters 13;
the metal shielding box 11 is used for being placed on the grounding plate, and an accommodating space for accommodating the filter 40 is arranged in the metal shielding box 11; the input adapter 12 is arranged on the first side wall of the metal shielding box 11 in a penetrating manner, one end of the input adapter 12 is used for being electrically connected with the input end of the filter 40, and the other end of the input adapter 12 is used for being electrically connected with the output end of the signal source; output adapter 13 wears to establish on the second lateral wall of metallic shield case 11, and output adapter 13's one end is used for being connected with the output electricity of wave filter 40, and output adapter 13's the other end is used for being connected with the input electricity of receiver, and input adapter 12 and output adapter 13 one-to-one.
The filter insertion loss test tool 10 is used for testing the common mode insertion loss and the differential mode insertion loss of the filter 40. Since the filter 40 is placed inside the metal shield case 11, the filter 40 can be grounded by contacting the bottom wall or the side wall of the metal shield case 11, and at the same time, both the signal source and the receiver are grounded. When the common mode insertion loss is tested, the same signal is input into the two input ends of the filter 40, so that only one signal source can be used for being connected with one end of the input adapter 12, the other end of the input adapter 12 is connected with the two input ends of the filter 40 respectively, then the two output ends of the filter 40 are connected with one end of the same output adapter 13, the other end of the output adapter 13 is connected with a receiver, and the circuit building of the common mode insertion loss is completed. When the differential mode insertion loss test is performed, different signals need to be input into two input ends of the filter 40, therefore, a signal source is connected with one input end of the filter 40 through one input adapter 12, an output end, corresponding to the input end, of the filter 40 is connected with a receiver through one output adapter 13, then the grounded load resistor 30 is connected with the other input end of the filter 40 through the other input adapter 12, and the other output end of the filter 40 is connected with the grounded load resistor 30 through the other output adapter 13, so that the circuit building of the differential mode insertion loss test is completed. Therefore, the filter insertion loss test tool 10 can simultaneously realize the test of the common-mode insertion loss and the differential-mode insertion loss by arranging the two input adapters 12 and the two output adapters 13, is convenient for switching a common-mode insertion loss test circuit and a differential-mode insertion loss test circuit, and is simple to operate. Meanwhile, the filter 40 is placed in the metal shielding box, so that external electromagnetic signals are shielded, interference of the external electromagnetic signals on the test result is reduced to the maximum extent, crosstalk of electromagnetic signals of the input end of the receiver and the output end of the signal source can be shielded, the electromagnetic coupling between the input end and the output end is prevented from influencing the test result, and the accuracy of the insertion loss test is ensured.
Wherein, two input adapter 12 set up along the horizontal direction interval, and the axis interval distance of two input adapter 12 is 45mm. Two output adapter 13 set up along the horizontal direction interval, and two output adapter 13's axis interval distance is 45mm.
Specifically, as shown in fig. 1, in an embodiment, the metal shielding box 11 includes a box body 111 and a box cover 112, a receiving space is provided in the box body 111, the receiving space is provided with an opening communicating with the outside, the box cover 112 is used for sealing the opening, and the first side wall and the second side wall are provided on the box body 111. The cover 112 and the housing 111 are arranged in a manner that facilitates the removal and insertion of the filter 40 during testing.
In the present embodiment, the metal shield case 11 includes a copper shield case.
Specifically, as shown in fig. 1, in an embodiment, the filter insertion loss test fixture 10 further includes a first screw, an end surface of the box 111 with an opening is a top surface, a position on the top surface along a circumferential direction of the box 111 is provided with an edge connecting portion 14, the edge connecting portion 14 is provided with a plurality of first mounting holes, the box cover 112 is provided with a plurality of second mounting holes 113, the first mounting holes correspond to the second mounting holes 113 one by one, an end surface of the box cover 112 facing the box 111 is attached to the edge connecting portion 14, and the first screw passes through the first mounting hole and the second mounting hole 113, so that the edge connecting portion 14 is connected to the box cover 112. The first screw enables the box cover 112 and the box body 111 to be detachably connected, and ensures that the box cover 112 and the box body 111 are completely and hermetically connected in the test process, so that the shielding continuity of the metal shielding box 11 is improved. Specifically, the metal shielding box 11 can shield electromagnetic signals in a frequency band of 10 kHz-18 GHz, and the shielding effectiveness can reach more than 60 dB.
Specifically, as shown in fig. 1, in an embodiment, a handle 15 is disposed on an end surface of the box cover 112 facing away from the box body 111, the handle 15 includes a suction cup 151 and a carrying portion 152, the suction cup 151 is disposed on the box cover 112, the carrying portion 152 is rotatably connected to the suction cup 151, and a rotation axis of the carrying portion 152 rotating relative to the suction cup 151 is parallel to the box cover 112. The suction cup 151 is detachably coupled to the cover 112, and the handle 15 is used to move the cover 112.
Specifically, as shown in fig. 1, in an embodiment, the filter insertion loss test fixture 10 further includes a second screw, a plurality of third mounting holes 114 are formed in the bottom wall of the metal shielding box 11, a plurality of fourth mounting holes are formed in the filter 40, and the second screw passes through the fourth mounting hole and the third mounting hole 114, so that the filter 40 is connected to the bottom wall. The second screw can guarantee the good overlap joint of filter 40 and metallic shield case 11 for the overlap joint resistance between filter 40 and the metallic shield case 11 is less than 2.5m omega, therefore filter 40 can realize good ground effect through metallic shield case 11, avoids overlap joint resistance to influence insertion loss's test result.
Wherein, the plurality of third mounting holes 114 forms a plurality of queues at even intervals along the length direction of the bottom wall, and the plurality of third mounting holes 114 in each queue are at even intervals. Specifically, the plurality of third mounting holes 114 are arranged in 8 rows in the width direction, 18 rows in the length direction, the distance between the centers of two adjacent third mounting holes 114 in the width direction is 6mm, the distance between the centers of two adjacent third mounting holes 114 in the length direction is 6mm, and the diameter of each third mounting hole 114 is 4mm. The third mounting holes 114 arranged at equal intervals are favorable for being adapted to different fourth mounting hole positions of the filters 40 with different shapes, so that the application range of the filter insertion loss test tool 10 to different filters 40 is expanded, and good contact between different filters 40 and the metal shielding box 11 is ensured. Meanwhile, since the diameter of the third mounting hole 114 is small, the plurality of third mounting holes 114 do not affect the electromagnetic shielding effect of the metallic shielding box 11.
And, the thickness of the bottom wall of the metallic shield case 11 is larger than the length of the second screw. Specifically, the thickness of the bottom wall of the metal shielding box 11 is 13mm, so that the second screw is prevented from being too long and extending out of the bottom of the metal shielding box 11, and the influence on the lap joint between the metal shielding box 11 and the grounding plate is avoided.
Specifically, as shown in fig. 1, in an embodiment, the filter insertion loss test fixture 10 further includes a third screw, a plurality of fifth mounting holes 115 are formed in the bottom wall of the metal shielding box 11, a plurality of sixth mounting holes are formed in the ground plate, and the third screw passes through the fifth mounting hole and the sixth mounting hole, so that the metal shielding box 11 is connected to the ground plate. The third screw is used for ensuring good lap joint between the bottom wall of the metal shielding box 11 and the grounding plate, so that the grounding stability of the filter 40 is ensured, and the accuracy of the insertion loss test of the filter 40 is improved.
Specifically, in an embodiment, the input adapter 12 includes an N-type connector located in the accommodating space and an SMA-type connector located outside the accommodating space, the N-type connector and the SMA-type connector are coaxially connected, the N-type connector is used for connecting with the filter 40, and the SMA-type connector is used for connecting with a signal source;
specifically, in an embodiment, the output adapter 13 includes an N-type connector located in the accommodating space and an SMA-type connector located outside the accommodating space, the N-type connector and the SMA-type connector are coaxially connected, the N-type connector is used for connecting with the filter 40, and the SMA-type connector is used for connecting with the receiver.
Specifically, as shown in fig. 1, in one embodiment, a flange 16 is disposed on the first side wall, and the input adapter 12 passes through the flange 16 and is connected to the first side wall.
Specifically, as shown in fig. 1, in an embodiment, a flange 16 is disposed on the second side wall, and the output adapter 13 passes through the flange 16 and is connected to the second side wall.
Specifically, as shown in fig. 1, in one embodiment, the first sidewall and the second sidewall are oppositely disposed.
As shown in fig. 2 and 3, in an embodiment, a filter insertion loss testing system 100 is provided, which includes a ground plate, a signal source, a receiver, and a filter insertion loss testing fixture 10, where the signal source, the receiver, and the filter insertion loss testing fixture 10 are all placed on the ground plate, an output end of the signal source is connected to an input adapter 12 of the filter insertion loss testing fixture 10, and an input end of the receiver is connected to an output adapter 13 of the filter insertion loss testing fixture 10.
The filter insertion loss test system 100 described above is used to test the common mode insertion loss and the differential mode insertion loss of the filter 40. Since the filter 40 is placed in the metal shield case 11 and the metal shield case 11, the signal source, and the receiver are all placed on the ground plate, the filter 40 can be grounded by contacting the bottom wall or the side wall of the metal shield case 11, and the signal source and the receiver are both grounded. When the common mode insertion loss is tested, the same signal is input into the two input ends of the filter 40, so that only one signal source can be used for being connected with one end of the input adapter 12, the other end of the input adapter 12 is connected with the two input ends of the filter 40 respectively, then the two output ends of the filter 40 are connected with one end of the same output adapter 13, the other end of the output adapter 13 is connected with a receiver, and the circuit building of the common mode insertion loss is completed. When the differential mode insertion loss test is performed, different signals need to be input into two input ends of the filter 40, therefore, a signal source is connected with one input end of the filter 40 through one input adapter 12, an output end, corresponding to the input end, of the filter 40 is connected with a receiver through one output adapter 13, then the grounded load resistor 30 is connected with the other input end of the filter 40 through the other input adapter 12, and the other output end of the filter 40 is connected with the grounded load resistor 30 through the other output adapter 13, so that the circuit building of the differential mode insertion loss test is completed. Therefore, the filter insertion loss test tool 10 can simultaneously realize the test of the common-mode insertion loss and the differential-mode insertion loss by arranging the two input adapters 12 and the two output adapters 13, is convenient for switching a common-mode insertion loss test circuit and a differential-mode insertion loss test circuit, and is simple to operate. Meanwhile, the filter 40 is placed in the metal shielding box, so that the external electromagnetic signals are shielded, the interference of the external electromagnetic signals on the test result is reduced to the maximum extent, the crosstalk of the electromagnetic signals of the input end of the receiver and the output end of the signal source can be shielded, the electromagnetic coupling between the input end and the output end is prevented from influencing the test result, and the accuracy of the insertion loss test is ensured.
Specifically, as shown in fig. 2 and 3, in an embodiment, the load resistor 30 is a 50 Ω resistor, and in the common mode insertion loss test circuit, the load resistor 30 is disposed between the signal source and the input terminal of the filter 40, and the load resistor 30 is disposed between the receiver and the output terminal of the filter 40.
In this particular embodiment, both the source and the receiver are network analyzers 20. Wherein the output of the network analyzer 20 is connected to the input of the filter 40 and the input of the network analyzer 20 is connected to the output of the filter 40. And the network analyzer 20 is placed on the ground plane.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The utility model provides a filter insertion loss test fixture which characterized in that includes:
the metal shielding box is used for being placed on a grounding plate, and an accommodating space for accommodating the filter is formed in the metal shielding box;
the input adapter is arranged on the first side wall of the metal shielding box in a penetrating mode, one end of the input adapter is used for being electrically connected with the input end of the filter, and the other end of the input adapter is used for being electrically connected with the output end of the signal source;
two output adapter, output adapter wears to establish on the second lateral wall of metallic shield case, output adapter's one end be used for with the output electricity of wave filter is connected, output adapter's the other end is used for being connected with the input electricity of receiver, input adapter with output adapter one-to-one.
2. The filter insertion loss test tool according to claim 1, wherein the metal shielding box comprises a box body and a box cover, the box body is internally provided with the accommodating space, the accommodating space is provided with an opening communicated with the outside, the box cover is used for sealing the opening, and the first side wall and the second side wall are arranged on the box body.
3. The filter insertion loss test fixture according to claim 2, further comprising a first screw, wherein the end face of the opening on the box body is a top face, an edge connecting portion is arranged on the top face along the circumferential direction of the box body, a plurality of first mounting holes are arranged on the edge connecting portion, a plurality of second mounting holes are arranged on the box cover, the first mounting holes correspond to the second mounting holes in a one-to-one manner, the end face of the box cover facing the box body is attached to the edge connecting portion, and the first screw penetrates through the first mounting holes and the second mounting holes, so that the edge connecting portion is connected with the box cover.
4. The filter insertion loss test tool according to claim 2, wherein a handle is arranged on an end surface of the case cover facing away from the case body, the handle comprises a suction cup and a carrying portion, the suction cup is arranged on the case cover, the carrying portion is rotatably connected with the suction cup, and a rotating shaft of the carrying portion relative to the rotation of the suction cup is parallel to the case cover.
5. The filter insertion loss test tool according to claim 1, further comprising second screws, wherein a plurality of third mounting holes are formed in the bottom wall of the metal shielding box, a plurality of fourth mounting holes are formed in the filter, and the second screws penetrate through the fourth mounting holes and the third mounting holes, so that the filter is connected with the bottom wall.
6. The filter insertion loss test fixture of claim 5, wherein the plurality of third mounting holes are uniformly spaced along the length direction of the bottom wall to form a plurality of rows, and the plurality of third mounting holes in each row are uniformly spaced.
7. The filter insertion loss test fixture according to any one of claims 1-6, wherein the filter insertion loss test fixture further comprises a third screw, a plurality of fifth mounting holes are formed in the bottom wall of the metal shielding box, a plurality of sixth mounting holes are formed in the ground plate, and the third screw penetrates through the fifth mounting holes and the sixth mounting holes, so that the metal shielding box is connected with the ground plate.
8. The filter insertion loss test tool according to any one of claims 1 to 6, wherein the input adapter comprises an N-type connector located in the accommodating space and an SMA-type connector located outside the accommodating space, the N-type connector and the SMA-type connector are coaxially connected, the N-type connector is used for being connected with the filter, and the SMA-type connector is used for being connected with the signal source;
and/or, output adapter is including being located N type connector in the accommodation space with be located the outer SMA type connector of accommodation space, N type connector with SMA type connector coaxial coupling, N type connector be used for with the wave filter is connected, SMA type connector be used for with the receiver is connected.
9. The filter insertion loss test tool according to any one of claims 1 to 6, wherein a flange is arranged on the first side wall, and the input adapter penetrates through the flange to be connected with the first side wall;
and/or a flange plate is arranged on the second side wall, and the output adapter penetrates through the flange plate to be connected with the second side wall;
and/or the first side wall and the second side wall are oppositely arranged.
10. A filter insertion loss test system is characterized by comprising a ground plate, a signal source, a receiver and the filter insertion loss test tool according to any one of claims 1 to 9, wherein the signal source, the receiver and the filter insertion loss test tool are all placed on the ground plate, the output end of the signal source is connected with an input adapter of the filter insertion loss test tool, and the input end of the receiver is connected with an output adapter of the filter insertion loss test tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221676702.8U CN218567479U (en) | 2022-07-01 | 2022-07-01 | Filter insertion loss test tool and test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221676702.8U CN218567479U (en) | 2022-07-01 | 2022-07-01 | Filter insertion loss test tool and test system |
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