RU1800376C - Microwave transformer - Google Patents

Abstract

Usage: for measuring the microwave power level, Summary of the invention: the microwave power converter comprises a dielectric substrate 1, on one side of which are film contacts 2, between the edges of which there is a resistive element 3, the edge of at least one contact opposite the resistive element 3, connected to the heat sink 4, one group of thermocouple junctions 5 is located near the contact-resistive element boundary, and the other group of thermocouple junctions 5 is located near the connection of contact 2 with the heat sink 4. 3 ill.

Description

Phi & 1

The invention relates to radio measurements and can be used to measure power level.

The purpose of the invention is to expand the frequency range by reducing the frequency dependence.

Figure 1 schematically shows a microwave power converter; figure 2 is a view of figure 1; in Fig.3 - view B in Fig.2.

The microwave power converter contains a dielectric substrate 1, on the one side of which there are film contacts 2, between the edges of which there is a resistive element 3. The edge of at least one contact opposite to the resistive element 3 is connected to a heat sink 4, one group of junctions 6 of thermocouples 5 is located near the boundary of the contact-resistive element, and the other group of junctions 7 of thermocouples 5 is located near the connection of contact 2 with heat sink 4.

The microwave power converter operates as follows,

The signal under investigation supplied to the contacts 2 heats the resistive element 3, the heat from which is partially distributed in the direction of the heat sink 4 through the contact 2. As a result, a temperature gradient appears along the contact 2, indicated by the thermocouple 5, the junctions 6 and 7 of which, due to their location near resistive element 3 and heat sink 4, respectively, are at different temperatures. Since the thermocouples are located in parallel with the contact, they are shunted by microwave currents and practically do not create a frequency dependence of the transmission coefficient over a wide range.

The task of measuring the degree of heating of an element is most easily solved by arranging thermocouple junctions 5 in close proximity to a heat source 2 in its most heated part). This region, however, corresponds to the highest microwave voltage and, consequently, 0

5

0

5

0

5

0

5

In fact, the greatest influence of the capacitance of the resistive thermocouple element on the removal of part of the power along the thermocouple circuits, which limits the frequency range of the device from above.

In this transducer, thermocouples 5 are located in an area where there is practically no electric field, and therefore the effect of capacitance on the frequency response is minimal, since it does not lead to power branching into the thermocouple circuit. At the same time, an excess of temperature Ti relative to the housing (T0) remains sufficient for measurement.

The conversion coefficient K in both cases is determined by the ratio

 -a-p,

where KT is the coefficient of the converter according to the temperature KT 1 r °;

P is the power dissipated in the converter;

p is the number of thermocouples; a is the conversion coefficient of the thermocouple.

Claims (1)

The claims A microwave power converter comprising a dielectric substrate, on one side of which are film contacts with a resistive element between their edges, on the other side are one or more series-connected thermocouples, and a heat sink, characterized in that, in order to expand the frequency range due to to reduce the frequency dependence, the edge of at least one of the film contacts, opposite the resistive element, is connected to the heat sink, one group of thermocouple junctions is located in the region of the pl a female contact is a resistive element, and the other in the area where the film contact is connected to the heat sink. view Mb S Pfte .2 / fig.Z