JPS61113301A - Microstrip line terminator - Google Patents

Abstract

PURPOSE:To obtain an excellent impedance characteristic even to a high frequency over the X band by arranging a resistor to a through-hole provided to a dielectric base and connecting a strip conductor and a ground conductor to the resistor. CONSTITUTION:The strip conductor 4 is connected to a ground conductor 3 at a ridge in the lengthwise direction (end of the dielectric base 1) by using a conductor 6. A resistor 5 is inserted or coated in the inside of the hole penetrating the base 1 at a length of 1/4 wavelength from the ridge of said strip conductor 4. The resistor 5 is connected also to the strip conductors 2,4 and the grounding conductor 3. Through the forming above, the deterioration in the characteristic due to the reactance of the terminating part is less to a high frequency signal over the X band. Thus, an excellent impedance characteristic is obtained.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a microscopy device constructed on a dielectric substrate.
Concerning a terminator for a Jtubu line.

(Prior art) ゛ - Figure 2 (a) is a plan view showing a conventional microphone strip line terminator, and Figure 2 ('b) is a cross-sectional view of the same along B-B line 1A, where 1 is a dielectric substrate. , 2 is a strip conductor, 3 is a ground conductor, 4 is a strip conductor, and 5 is a resistor. In this microstrip line terminator, (I) A resistor 5 is arranged at the terminal end of the tab conductor 2, and the conductor 4 at the rear of the resistor 5 is grounded to the ground conductor 3 at the end of the board 1. be. Figure 3 (a) is a plan view showing another conventional Acro strip line terminator;
-C is an ancestor cross-sectional view. In the terminator shown in this figure, the conductor 4 behind the resistor 5 has an open end at a quarter wavelength from the resistor 5. In these two systems, when the resistance value of the resistor 5 is made equal to the characteristic resistance of the line, it becomes a terminator.

(Problems to be Solved by the Invention) However, in the structure shown in FIGS. 2(a) and 2(t), the propagating electromagnetic wave is a high frequency, and the length of the conductor 4 that short-circuits the rear part of the resistor 5 is the length of the electromagnetic wave. If the wavelength is not negligible compared to the wavelength, the inductance of the conductor 4 has the disadvantage of deteriorating the impedance characteristics of the terminator. In addition, Fig. 3 (a
), (1=), the impedance characteristics change depending on the external environment in which the open end of the conductor 4 behind the resistor 5 is placed (for example, the presence or absence of a metal plate). has the disadvantage that it is inconvenient when applying a DC bias because it is not terminated.

Therefore, based on the above considerations, the present invention aims to provide a microstrip line terminator that exhibits good impedance characteristics even for high frequency signals of the X band or higher, and is grounded in terms of direct current. .

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a terminator for a microstrip line in which a strip conductor and a ground conductor face each other with a dielectric plate in between. The edge of the strip conductor in the longitudinal direction is connected to the ground conductor by a conductor perpendicular to the dielectric plate, and the edge of the strip conductor is connected to the ground conductor at a distance of about 1/4 wavelength from the edge in the longitudinal direction. A through hole is formed in the dielectric plate, and a resistor for connecting the strip conductor and the ground conductor is housed therein.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1(a) is a plan view showing one embodiment of the present invention;
(9) is a sectional view taken along the line A-A. In this embodiment, the strip conductor 4 is located at the longitudinal edge (in this figure the substrate 1
The ground conductor 3 is connected to the ground conductor 6 (coinciding with the edge of the strip conductor 4) at a quarter wavelength (
A resistor 5 is placed inside the hole penetrating the substrate 1 at λg/4).
is inserted or applied, and the resistor 5 is connected to the strip conductor 2.4 and the ground conductor 3.

In this embodiment, the admittance seen from the position of the resistor 5 toward the longitudinal edge of the strip conductor 4 is O at the center frequency, and therefore the resistance value between the upper and lower conductors of the resistor 5 is If it is made equal to the characteristic resistance, matching will be achieved and a terminator will be constructed. The embodiments shown in FIGS. 1(a) and ('b) configured as described above do not cause characteristic deterioration due to inductance of the line behind the resistor 5, and are similar to those in the case where the rear part of the resistor 5 is open-terminated. It is a terminator that is not affected by the environment, is grounded in terms of direct current, and can also be used as a return circuit for a direct current circuit.

If a manufacturing method such as a printing method is adopted in which the IJ tube conductor 2.4 and the ground conductor 3 are deposited on the dielectric substrate 1 in which the resistor 5 is embedded, the connection between the resistor 5 and both the upper and lower conductors can be easily made. As a result, manufacturing costs can be reduced.

Note that the quarter wavelength conductor 4 behind the resistor 5 reduces the admittance seen from the resistor 5 to the end of the strip line.
This is provided for the purpose of Therefore, the line formed by the conductor 4 does not need to have the same characteristic resistance as the line in front of the resistor 5; rather, the higher the invitance, the smaller the increase in admittance due to deviation from the center frequency. Serves as a broadband terminator.

(Effects of the Invention) As explained in detail above, according to the present invention, even for high frequency signals of A grounded microstrip line terminator can be provided.

[Brief explanation of drawings]

Figure 1 (-) is a plan view showing an embodiment of the present invention;
b) is a sectional view taken along the line A-A, FIG. 2(8) is a plan view showing a conventional microstrip line terminator, and FIG.
) is its BB ancestor sectional view, FIG. 3(a) tj: a plan view showing another conventional microstrip line terminator,
Figure (1)) is a sectional view taken along the line C-C. 1...Dielectric substrate, 2...S) IJ tube conductor, 3
...Grounding conductor, 4...Strip conductor, 5-...Resistor. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In a microstrip line terminator in which a strip conductor and a ground conductor face each other with a dielectric plate in between, a longitudinal edge of the strip conductor is connected to the ground conductor by a conductor perpendicular to the dielectric plate. A through hole is formed in the dielectric plate at a position one-quarter wavelength from the edge in the longitudinal direction, and a resistor for connecting the strip conductor and the ground conductor is housed therein. A microstrip line terminator featuring: