Measuring needle

Measuring needle

This creation is about a measuring needle, which is used to measure high frequency. It includes a contact side end used to make electrical contact with a planar structure and a wire side end used to connect with the wire, wherein the contact A coplanar conductor structure is provided between the side end and the wire side end. The coplanar conductor structure includes at least two conductors. The coplanar conductor structure is on a predetermined section between the wire side end and the contact side end. A dielectric for clamping the coplanar conductor structure is arranged on the side or both sides, and a measuring needle is arranged between the dielectric and the contact side end, so that the conductors of the coplanar conductor structure can be free relative to the dielectric with the clamping function in the space Produce elasticity.

German patent DE 199 45 178 A1 discloses the above-mentioned measuring needle. The production cost of this measuring needle is not high, and it can also be produced accurately in batches. This type of measuring needle has impedance control to perform measurement when it is in contact with a planar structure. , Will only produce a small amount of reflection.

The purpose of this creation is to further improve the electrical characteristics of the conventional measuring needle.

The structural feature of this creation is that the operating frequency is between 40 and 60 GHz. Because of the composition of this creation, the resistance of the overall coplanar conductor structure will not be dispersed, which means that regardless of the operating frequency, the resistance will not be dispersed. The conductive system of the coplanar conductor structure between the dielectric and the side end of the coaxial wire is set to freely produce elastic effects, so that the structural design can make all the conductors of the coplanar conductor structure and the corresponding contact position of a device under test reach a high The contact quality, if the measuring needle is placed in an inverted position on the contact position of the planar structure, the contact quality will not be affected.

The measuring needle of this creation is provided with a shielding element on one side of the flat structure facing the flat structure when it is in contact with the flat structure. The shielding element extends into the area of the co-planar conductor structure between the dielectric and the side end of the contact. The co-planar conductor structure In the space, it can freely produce elasticity with respect to the dielectric with the clamping function.

In this creation, the coplanar conductor structure that can freely generate elasticity relative to the dielectric with the clamping function in the space is electrically shielded by the planar structure, so it can effectively prevent the transmission from the planar conductor structure to the coplanar conductor structure. The elasticity can be freely generated. The electrical signal of the active part produces undesired interference, while avoiding or at least significantly reducing the undesirable electrical effect due to the proximity between the same-planar conductor structure and the planar structure during testing.

If the shielding member of the same-planar conductor structure made of conductive material has a small thickness, it can produce a particularly good electrical shielding effect on the planar structure.

According to a preferred embodiment, the shielding element is electrically connected to at least one conductor of a coplanar conductor structure that can freely generate an elastic effect with respect to a dielectric with a clamping function in the space.

The shielding member is at one end facing the side end of the measuring lancet contact, and is electrically connected with at least one conductor of the same plane conductor structure that can freely generate elastic action with respect to the dielectric with the clamping function in the space.

If the shielding member is additionally mechanically connected with at least one conductor of the coplanar conductor structure that can freely generate elastic action with respect to the dielectric with the clamping function in the space, it is particularly easy to make the shielding member and the coplanar conductor structure Electrical contact is made between at least one conductor.

According to a preferred embodiment, the wire of the same plane conductor structure electrically or mechanically connected to the shielding member is a grounding conductor.

In order to further improve the shielding function of the shielding member, the measuring needle has a housing made of conductive material, and the shielding member is electrically connected to the housing.

According to a preferred embodiment, the coplanar conductor structure has three conductors, wherein the conductor in the middle is a signal conductor, and the remaining two are grounded conductors.

In order to further improve the shielding function, a shielding element is provided on the opposite side of the measuring needle. This additional shielding element extends to the area of the same-plane conductor structure between the dielectric and the contact side end, and the same-plane conductor structure is in the space. It can freely produce elasticity with respect to the dielectric with clamping function.

Regarding the technical means used in this creation to achieve the above-mentioned purposes and effects, a preferred and feasible embodiment is presented and shown in the drawings. The details are as follows:

Please refer to Figures 1 to 4, which show a preferred embodiment of the creation of the measuring needle, which includes a housing 10 and a coaxial connector 14 for connecting coaxial cables (not shown in the figure) ) Of the coaxial wire side end 12, a contact side end 16 for making electrical contact with a planar structure 38, and a coplanar conductor structure formed between the coaxial wire side end 12 and the contact side end 16 , Wherein the same plane conductor structure has a signal conductor 18 and two ground conductors 20, a gap 22 is formed between the signal conductor 18 and each ground conductor 20 of the same plane conductor structure, and the gap 22 spans the same plane conductor structure The entire length, thereby generating a stable preset wave resistance.

In the middle section between the coaxial wire side end 12 and the contact side end 16, the coplanar conductor structure is clamped by a quartz block-shaped dielectric 24 (as shown in the fourth figure). The dielectric 24 is in the same position. The plane conductor structure is set on one or both sides, so that the two sides of the same plane conductor structure can be clamped by a dielectric 24 respectively. The dielectric 24 and the same plane conductor structure are stacked on top of each other like a sandwich. The planar conductor structures are fixed together, and each side facing the ground conductor 20 of the same-planar conductor structure is provided with a layer of gold plating, and this layer of gold plating roughly corresponds to the shape of the same-planar conductor structure within the dielectric 24, thereby , Can make the dielectric 24 and the conductors 18, 20 of the same plane conductor structure achieve a particularly strong and close connection effect. Because of the electromagnetic relationship with the dielectric 24, the gap 22 is wider in the dielectric 24, so that A stable and preset wave resistance can be generated across the entire length of the coplanar conductor structure, extending from the coaxial wire side end 12 to the contact side end 16, and the dielectric 24 is embedded in the housing 10 and facing the contact side end of the housing 10 One end surface 40 of 16 is neatly joined to housing 10.

The conductors 18, 20 are arranged between the dielectric 24 and the contact side end 16. Although each conductor 18, 20 is clamped to a certain extent in the space, it can still individually generate elastic effects in the dielectric 24. If Mechanically press the contact side end 16 of the test lancet to the corresponding contact position of the planar structure 38, for example, press it to a circuit to be tested, then each single conductor 18, 20 of the same planar conductor structure will be free to generate elasticity Function, so that each conductor 18, 20 can make excellent electrical contact with its matched contact position. If the measuring needle is pressed down mechanically to the contact position, the measuring needle will tip slightly, and the conductors 18, 20 The slight errors on the surface of the contact position between 20 itself and the planar structure 38 can be compensated by the elastic action of the individual conductors 18 and 20. In this way, the conductors 18 and 20 are mechanically placed at the corresponding contact positions each time. At the same time, it can produce the same and accurate contact forever, and then achieve excellent test results by measuring the needle with this creation.

The three conductors 18, 20 of the measuring lancet are grounded-signal-grounded, for example: gsg (g means grounding, s means signal); of course, the same plane conductor structure can also only be provided with two or more conductors 18, 20. The distribution of the signal conductor 18 and the ground conductor 20 is as follows: gsgsgsg... or gsggsggsgg... etc. In this way, the circuit to be tested can also be generated with a single measuring needle with multiple coplanar signal wires In contact, the equivalent planar signal wire has a plurality of contact positions on the planar structure.

Preferably, the dielectric 24 has an entire surface of gold plating (not shown in the figure) on the side facing away from the coplanar conductor structure. This layer of gold plating will oppress the undesired higher order mode outside the operating frequency, and at the same time A closed system is created above the predetermined range of the ground conductor 20 of the same plane conductor structure.

On the contact side end 16, the conductors of the same plane conductor structure are tapered into the stinger 28 of the signal conductor 18 and the stinger 30 of the ground conductor 20 used to form the conductor structure. The structure corresponds to the planar structure 38. The structure of the contact position of the contact, in particular, corresponds to a circuit to be tested.

The characteristic of the measurement needles of the present creation shown in the first to fourth figures is that the resistance set by the gaps 22 beyond the conductor structure of the same plane is substantially not dispersed, that is, the resistance and phase velocity are substantially different. Affected by operating frequency.

When the measuring lancet is in contact with the planar structure 38, a side 32 facing the planar structure 38 is additionally provided with a shield 34 (refer to the second and third figures), and the first figure is the measurement of the side 32 of the lancet From the bottom view, the shielding member 34 extends between the dielectric 24 and the contact side end 16 until the conductors 18, 20 can freely generate elastic effects in the space 26, when the measuring needle touches the contact position of the planar structure 38 (As shown in the second and third figures), the shielding member 34 is disposed between the planar structure 38 and the in-plane conductor structure, and correspondingly shields the in-plane conductor structure so that it is in or out of the plane structure 38 The circuit to be tested has no electrical or electromagnetic contact. This way, the planar structure 38 can effectively avoid or at least significantly reduce the adverse effects of the planar structure 38 on the measurement stinger or the same-planar conductor structure. Such adverse effects include electrical signals from the planar structure 38. Coupling into the in-plane conductor structure may generate noise, or include changes in the electrical characteristics of the in-plane conductor structure, such as in testing, which will cause undesirable changes in the test results when the planar structure 38 is tested with the measurement probe.

The shielding member 34 is electrically conductively connected to the housing 10, as indicated by 35 in the first figure. Preferably, the housing 10 is made of conductive material and is electrically connected to a grounding contact through a corresponding circuit. The connection enables the housing 10 and the shielding member 34 to form an accurate grounding level. The shielding member 34 is also made of conductive material, so that the shielding member 34 can have a shielding effect even if the thickness is small.

In order to further enhance the shielding function of the shielding member 34, one end of the shielding member 34 facing the side end 16 of the measuring needle contact is electrically connected to the two grounding conductors 20 via the contact position 36. Because the shielding member 34 is relatively movable and bendable Therefore, the mobility of the ground conductor 20 in the area 26 is only slightly affected.

In summary, this creation has indeed achieved the intended use purpose and effect, and it is more ideal and practical than the conventional ones. However, the above-mentioned embodiments are only specific descriptions of the preferred embodiments of this creation. The embodiments are not intended to limit the scope of patent application for this creation. All other equivalent changes and modifications completed without departing from the technical means disclosed in this creation shall be included in the scope of patent application covered by this creation.

<p>10Shell</p><p>12Coaxial cable side end</p><p>14Coaxial connector</p><p>16Contact side end</p><p>18Signal conductor</p><p>20Grounding conductor</p><p>22Gap</p><p>24Dielectric</p><p>26area</p><p>28Needle</p><p>30Needle</p><p>32Side</p><p>34Mask</p><p>35Conductive connection</p><p>36Contact location</p><p>38Plane structure</p><p>40end face</p>

The first figure shows a preferred embodiment of the measuring needle of this invention, which is a bottom view of the measuring needle.

The second figure shows the side view of the measuring needle in the first figure.

The third figure shows an enlarged view of part A in the second figure.

The fourth figure shows the front view of the measuring needle in the first picture, showing that the contact side end of the measuring needle is in the direction of arrow B in the third picture.