JPH04135002U - Microstrip line cross circuit - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of this invention is to form a crossing circuit using microstrip lines in order to achieve automatic mounting and to stabilize resonance. [Configuration] First transmission line 1 that transmits the first high frequency signal
0, the second transmission line 11 for transmitting a DC signal or a second high frequency signal having a lower frequency band than the first high frequency signal is placed approximately at a cross with respect to the first transmission line 10. It is formed by microstrip lines connected in a shape,
It is configured to be grounded in terms of high frequency at a position 1/4 wavelength away from the contact point with the first transmission line 10 with respect to the center frequency of the first high frequency signal. As a result, the second transmission line 11 becomes open at the center frequency of the first high frequency signal, and the DC signal or the second high frequency signal transmitted to the second transmission line 11 is transmitted to the first transmission line. It becomes possible to transmit the data without affecting 10.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on microwave integrated circuits used in the microwave band, millimeter wave band, etc. A microstrip line related to road equipment, especially used for transmitting signals. Concerning shape crossing circuits.

0002

[Conventional technology]

Conventionally, this type of microstrip line cross circuit has a first circuit as shown in FIG. The first transmission line 1 through which the high-frequency signal is transmitted is formed of a microstrip line. , compared to the DC signal or the first high frequency signal to this first transmission line 1. The second transmission lines 2a and 2b, through which a sufficiently low second high frequency signal is transmitted, are micro A strip line whose tip end is spaced apart from the first transmission line 1 by a predetermined distance. Formed in the shape of a cross. Then, this second transmission line faces the first transmission line. Lands 3a and 3b are formed at the tip, respectively. Between this land 3a and 3b A conducting wire is installed to intersect with the first transmission line 1, and the end of this conducting wire 4 is are connected by soldering. Also, one part of the high frequency short circuit capacitor 5 is connected to the lands 3a and 3b. The other end of this capacitor 5 is connected to the grounding through holes 6a and 6b. It will be done.

0003 With the above configuration, the conductor has a DC signal transmitted to the second transmission lines 2a and 2b. Or the second high frequency signal and the first high frequency signal transmitted to the first transmission line 1. Configure a crossing circuit.

0004 However, in the above microstrip line cross circuit, the conductor 4 is connected to the first transmission line. 1, the work has to be done manually. As a result, the mounting position is likely to fluctuate, making it difficult to perform high-precision mounting. The problem was that it took a lot of time to do the work. Also, according to this, the conductor 4 will cross the high frequency electromagnetic field leaking from the first transmission line 1. However, there is a risk that resonance that is difficult to predict may occur.

[0005]

[Problem that the idea aims to solve]

As mentioned above, conventional microstrip line crossing circuits have high accuracy. Difficult to implement, time consuming, and prone to unpredictable resonances There was a problem with this.

[0006] This idea was made in view of the above circumstances, and it simplified the configuration and enabled automatic implementation. A microstrip line that achieves this and stabilizes resonance. The purpose is to provide a cross-sectional circuit.

[0007]

[Means to solve the problem]

This idea is based on a first line formed of a microstrip line that transmits the first signal. a transmission line and a direct current or a second signal having a lower frequency band than the first signal. on the same surface as the first transmission line, and on the same surface as the first transmission line. are connected in a substantially cross shape to the first transmission line, and the first signal is transmitted from the contact point with the first transmission line. A microstrike where a point approximately 1/4 wavelength away from the center frequency is grounded at a high frequency. A microstrip line type horizontal transmission line with a second transmission line formed of a lip line. This constitutes a disconnection circuit.

[0008]

[Effect]

According to the above configuration, the second transmission line extends from the contact point with the first transmission line to the first transmission line. Since the position approximately 1/4 wavelength from the center frequency of the signal is grounded, the It becomes an open state at the center frequency of the signal No. 1. Therefore, the transmission to the second transmission line is The second signal sent to the second transmission line is transmitted through the second transmission line without affecting the first transmission line. transmitted to the transmission line.

[0009]

【Example】

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

0010 FIG. 1 shows a microstrip line type crossing circuit according to an embodiment of this invention. Therefore, 10 in the figure is the first transmission line through which the first high-frequency signal is transmitted, and the microscopy Formed by trip lines. On the same plane in the middle part of this first transmission line 10 is a DC signal or a second high frequency signal that is sufficiently lower than the first high frequency signal. The second transmission line 11 is connected in a substantially cross shape on the microstrip line for transmission. (See Figure 2). The second transmission line 11 is connected to the first transmission line 10. The high frequency is approximately 1/4 wavelength from the point of contact with the center frequency of the first high frequency signal. It is connected to the grounding through holes 13a and 13b via the wave shorting capacitor 12. and grounded.

[0011] In the above configuration, the second transmission line 11 is connected to the first transmission line 10 from the contact point with the first transmission line 10. The position of approximately 1/4 wavelength for the center frequency of the high frequency signal of 1 is grounded. This results in an open state at the center frequency of the first high frequency signal. This results in The DC signal or the second high frequency signal transmitted to the second transmission line 11 is to the second transmission line 11 without having almost any effect on the transmission line 10. transmitted. This experimentally shows that the insertion loss has a characteristic A shown by the solid line in Figure 3, and that It has been confirmed that the reflection loss has characteristic B shown by the solid line in FIG.

0012 In this way, the microstrip line type crossing circuit transmits the first high frequency signal. On the same plane as the first transmission line 10 to be transmitted, the DC signal or the first high frequency signal is A second transmission line 11 that transmits a second high frequency signal whose frequency band is lower than that of the signal. , a microstrip line connected to the first transmission line 10 in a substantially cross shape. from the contact point with the first transmission line 10 to the center frequency of the first high frequency signal. It was configured to be grounded at a high frequency at a position approximately 1/4 wavelength away. Thanks to this For example, the second transmission line 11 receives the first high-frequency signal from the contact point with the first transmission line 10. Since the center frequency is grounded at a position approximately 1/4 wavelength, the first high It becomes an open state at the center frequency of the frequency signal and is transmitted to the second transmission line 11. The direct current signal or the second high frequency signal influences the first transmission line 10. It becomes possible to transmit data without As a result, the conventional manual wiring work for conductors has been eliminated. It is possible to form the second transmission line 11 using a microstrip line without any hassle. This makes it possible to realize automatic mounting and also to configure on the same plane. By doing so, it is possible to prevent resonance that is difficult to predict due to the three-dimensional intersection, and stabilize the resonance. will be realized.

[0013] Furthermore, this invention is not limited to the above embodiments, but is shown in FIGS. 5, 6, 7, and 8. It may be configured as shown. However, in Figures 5 and 6, Figures 7 and 8, the above The same parts as in Figures 1 and 2 are given the same reference numerals here, and their explanations are omitted. Omitted.

[0014] In the embodiments of FIGS. 5 and 6, the second transmission line 11a is connected to the first transmission line 10. , 11b, for example, the center frequency of the first high frequency signal transmitted through the first transmission line 10. From two positions separated by a number (approximately 1/4 + n/2) wavelength (n = positive number) The connection structure is such that it extends in the opposite direction (see FIG. 6). according to this , when the frequency of the first high-frequency signal slightly fluctuates from the predetermined center frequency. Also, it becomes possible to cancel the susceptance of the second transmission lines 11a and 11b. , compared to the embodiments shown in FIGS. 1 and 2, the advantage is that it is possible to use a wider band. have The insertion loss according to this example has a characteristic C shown by the broken line in FIG. It has been experimentally confirmed that the reflection loss has the characteristic D shown by the broken line in Figure 4 above. Ru.

[0015] In the embodiments of FIGS. 7 and 8, the second transmission line 11a is connected to the first transmission line 10. , 11b, for example, the center frequency of the first high frequency signal transmitted through the first transmission line 10. From two positions separated by a number (approximately 1/4 + n/2) wavelength (n = positive number) The connection is configured so that it extends in the opposite direction. And the input side of the first transmission line 10 And on the output side, there is a DC signal and a second high frequency signal whose frequency band is lower than that of the first high frequency signal. A capacitor 14 is provided which blocks the transmission of wave signals. This capacitor 14 is Ensure that the DC signal and the second high frequency signal are transmitted to the first transmission line 10. This enables even more stable transmission.

[0016] As the capacitor 14 for blocking the transmission of the second high frequency signal, the above embodiment However, the first transmission line 10 is arranged on both the input side and the output side of the first transmission line 10. Without being limited to this, at least one of the input side and output side of the first transmission line 10 Substantially the same effect can be expected by arranging it in .

[0017] Also, it is a contact point between the second transmission lines 11a and 11b and the first transmission line 10. The interval between the two positions is determined by the distance between the first high-frequency signals transmitted through the first transmission line 10. For the heart frequency, they were separated by (approximately 1/4 + n/2) wavelength (n = positive number), but this The spacing is not limited to , and may be set appropriately as necessary. Therefore, this invention is not limited to the above-mentioned embodiments, and may be used in other ways that deviate from the gist of this invention. Of course, various modifications can be made without departing from the above.

[0018]

[Effect of the idea]

As detailed above, this idea simplifies the configuration and realizes automatic implementation. Microstrip line cross section that can be used to stabilize resonance. The circuit can be provided.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a microstrip line type crossing circuit according to an embodiment of the present invention.

FIG. 2 is a plan view showing the arrangement shown in FIG. 1;

FIG. 3 is a diagram showing the insertion loss characteristics of FIGS. 1 and 5. FIG.

FIG. 4 is a diagram showing the reflection loss characteristics of FIGS. 1 and 5. FIG.

FIG. 5 is a circuit diagram showing another embodiment of the invention.

FIG. 6 is a plan view showing the arrangement shown in FIG. 5;

FIG. 7 is a circuit diagram showing an embodiment other than this invention.

FIG. 8 is a plan view showing the arrangement shown in FIG. 7;

FIG. 9 is a plan view showing the arrangement of a conventional microstrip line crossing circuit.

[Explanation of symbols]

10...First transmission line, 11, 11a, 11b...Second transmission line, 12...High frequency short circuit capacitor, 13a, 1
3b...Through hole for grounding, 14...Capacitor.

Claims (3)

[Scope of utility model registration request] Claim 1: A first transmission line formed of a microstrip line for transmitting a first signal, and a second signal for transmitting direct current or a second signal having a lower frequency band than the first signal. , on the same plane as the first transmission line,
It is connected to the first transmission line in a substantially cross shape, and is grounded at a point approximately 1/4 wavelength away from the contact point with the first transmission line with respect to the center frequency of the first signal. A microstrip line type crossing circuit comprising a second transmission line formed of a microstrip line. 2. The second transmission line extends in substantially opposite directions from two positions spaced apart by a predetermined distance in the middle of the first transmission line, and transmits the first signal from the contact point. 2. The microstrip line type crossing circuit according to claim 1, wherein the microstrip line crossing circuit is formed of a microstrip line which is grounded at high frequency at a point approximately 1/4 wavelength away from the center frequency. 3. The microcontroller according to claim 1, further comprising a capacitor provided on at least one of an input side and an output side of the first transmission line to prevent transmission of the second signal. Strip line type crossing circuit.