JPH0674974U - Track constant measurement jig - Google Patents

Abstract

(57) [Summary] [Purpose] To perform measurement efficiently even on film substrates. A gap serving as a coupling portion for forming a triplate line resonator is provided between a signal input / output terminal and a triplate line end, and a line portion of a substrate forming the triplate line resonator and a ground conductor. Provide sufficient space between and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for measuring the characteristics of a high frequency substrate material.

As a conventional method of measuring a line constant of a high frequency material, there are a ring resonator method for measuring a relative permittivity ε _r , a cylindrical cavity resonator method for measuring a dielectric loss tangent tan δ, and the like. In addition, the "Precise Measurements of Dissipation Factor in Micr-owave Prited Circuit Boards" (written by HIROYUKI TANAKA, FUMIAKI OKADA) published in IEEE TRANS-ACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL.38, NO. A method of measuring the above two constants using a linear line resonator having a structure is disclosed.

[0003]

[Problems to be solved by the device]

In the cylindrical cavity method, the cylindrical cavity itself must be manufactured for each measurement frequency, the manufacturing cost and the labor of measurement are great, and only the dielectric loss tangent tanδ can be measured. With the ring resonator method, it is possible to measure at the fundamental resonance frequency and a frequency that is an integral multiple of it, and it is relatively easy to fabricate the measurement sample and measurement jig, but only the relative permittivity ε _r can be measured. A separate method for measuring the dielectric loss tangent tan δ is required. On the other hand, the method reported by "Tanaka and Okada" above is a simple measurement sample.
This is a method that can measure both n δ and the equivalent conductivity σ eff, but the measurement sample needs to have a gap on the triplate line, and one measurement sample is measured while changing the fundamental resonance frequency. I can't. In addition, the triplate line is difficult to connect to the outside, and there is a risk that unwanted propagation modes will occur. Also, with a high frequency film substrate or the like, the film may be curled and the triplate line may not be formed well.

The present invention relates to a measuring jig for efficiently measuring even a film substrate or the like.

[0005]

[Means for Solving the Problems]

 In the measurement jig of the present invention, a gap serving as a coupling portion for forming a triplate line resonator is provided between a signal input / output terminal and an end of the triplate line resonator, and a gap of a substrate forming the triplate line resonator is provided. The feature is that a sufficient space is provided between the line portion and the ground conductor.

[0006]

【Example】

 As shown in FIG. 1, the measuring jig according to the present invention comprises connectors 1a and 1b which are connection points with a measuring machine such as a vector network analyzer, and a connector base metal fitting 2a which is a base for fixing the connector. 2b and circuit board coupling metal fittings 3a and 3b for fixing the circuit board 5 which is coupled with the connector base metal fittings 2a and 2b and forms the triplate line resonator to be measured to the connector 1a and 1b. In the measuring jig consisting of, the space is provided under the line even when the connector 1a, 1b and the circuit substrate 5 film substrate forming the triplate line resonator to be measured are used. The operation of the measuring jig according to the present invention will be described below. The connectors 1a and 1b are fixed to connector base metal fittings 2a and 2b, respectively, which serve as a base for fixing the connectors. Measuring instruments such as vector network analyzers are connected to connectors 1a and 1b. FIG. 2 shows an enlarged view of this portion. The core wires of the connectors 1a and 1b are not directly connected to the triplate line of the circuit board 5, but are capacitively coupled through a space having a certain distance. Further, the circuit board coupling fittings 3a and 3b are fixed to the connector base fittings 2a and 2b of the circuit board 5 by pressing the end portions of the circuit board 5 from above and below to make them adhere to each other and to make close contact with the connector base fittings 2a and 2b. The connection distance between the cores of the connectors 1a and 1b thus prepared is maintained, and a sufficient space is provided above and below the line on the circuit board. According to the method described above, the measuring jig according to the present invention is such that the connectors 1a and 1b are not directly connected to the triplate line resonator of the circuit board 5 but are capacitively coupled through a space having a certain distance. Therefore, by using this space as a gap, it is not necessary to provide a gap on the triplate line, and the circuit board coupling fitting 3a can be used even when measuring a triplate line resonator with an arbitrary line length. , 3b as long as the length. In addition, since it is not necessary to make a gap on the line when manufacturing a triplate line resonator, it can be easily made. For example, one measurement sample can be made long and then various lengths can be prepared. If the measurement is performed while cutting according to 3a and 3b (while changing the fundamental resonance frequency), the time and effort for sample preparation can be simplified. In addition, a sufficient space can be provided under the line between the circuit board coupling fittings 3a and 3b, which are ground conductors, and a dielectric material having an arbitrary permittivity can be sandwiched between them, or the space between the circuit board and It is possible to insert a metal foil that serves as a grounding conductor underneath, and it is possible to measure under various conditions. Even for thin circuit boards such as film boards, a triplate structure can be maintained and accurate measurements can be made by fixing the circuit board coupling fittings from above and below while applying sufficient tension at the board edges.

[0007]

[Effect of device]

 As described above, the measuring jig of the present invention is a measuring jig having a high efficiency with respect to the measuring method capable of simultaneously measuring the dielectric loss tangent tan δ and the equivalent conductivity σ eff among the line constants of the high frequency material. It is provided to enable measurement under various conditions and measurement of soft circuit boards such as film boards.

[Brief description of drawings]

FIG. 1A is a perspective top view showing an embodiment of the present invention, and FIG. 1B is a side view thereof.

FIG. 2 is a perspective side view showing a main part of an embodiment of the present invention.

[Explanation of symbols]

 1. Connector 2. Connector base fitting 3. Circuit board fittings 4. Circuit board

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A gap serving as a coupling portion for forming a triplate line resonator is provided between a signal input / output terminal and a triplate line end, and a line portion of a substrate forming the triplate line resonator. A measuring jig characterized in that a sufficient space is provided between the grounding conductor and the grounding conductor.