JPH051126Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a microstrip antenna that aims to improve the environmental resistance such as vibration resistance, shock resistance, and heat resistance characteristics required for satellite antennas. It is related to.

[Conventional technology]

In recent years, the above-mentioned microstrip antennas, which are small and lightweight, are often used for use on the ground as well as on board satellites.There are various types of microstrip antennas, but one that uses a dielectric substrate as a radiation conductor. For example, there are those shown in FIGS. 4 and 5 that are not interposed between the ground conductor and the ground conductor.
FIG. 4 is a plan view, FIG. 5 is a side view,
In the figure, 1 is a radiation conductor, 2 is a ground conductor, 3 is a holding conductor, 4 is a power supply circuit, 5a, 5b, 5c, and 5d are power supply wires, and 7 is a connector.

As described above, in the conventional microstrip antenna, the radiation conductor 1 is fixed to the ground conductor 2 by the holding conductor 3 located in the center thereof, and the feeding circuit 4 and the four feeding wires 5a in the lower part of the ground conductor 2 are connected to each other. ,5b,
5c and 5d are electrically connected. The high frequency power input from the input connector 7 is sent to the power supply circuit 4.
The power supply wire 5 is divided into four parts with a phase difference of 90 degrees each.
It is connected to the radiation conductor 1 by a, 5b, 5c, and 5d. As a result, it becomes hollow around a specific frequency determined by the electrical characteristics formed by the radiation conductor 1 and the ground conductor 2, and operates as an antenna by efficiently radiating electromagnetic field energy at the above-mentioned specific frequency.

In the above microstrip antenna,
The power supply wires 5a, 5b, 5c, and 5d are the power supply circuit 4.
Changes in position due to thermal expansion of the line within the radiating conductor 1
In order to remove stress caused by displacement due to vibration, thin conductive wires, such as copper wires of about 0.3 mm, are made with slack.

[Problem that the invention attempts to solve]

However, in such a configuration, when vibration or shock is applied, the distance between the radiation conductor 1 and the ground conductor 2 changes, and the power supply wires 5a, 5b, 5c,
There was a problem that 5d could not hold up and broke. For example, when the distance between the radiation conductor 1 and the ground conductor 2 is 7.5 mm, the power supply wires 5a, 5b, 5c, and 5d are 0.3 mm copper wires, and a random vibration of 5 Grms is applied,
The above fluctuation displacement is minute, about 0.03 mm (maximum), but even in this case, the power supply wires 5a, 5b, 5c,
The stress generated at 5d is 50 Kg ^f /mm ² (worst value), which is 2.5 times the breaking stress of copper (20 Kg ^f /mm ² ), so the power supply wire breaks. The above random vibration level, i.e. 5Grms, in this model is considerably lower than the random vibration level, e.g. 19.6Grms, generally required for satellite antennas. There was a problem where it could not be applied.

Furthermore, the distance between the radiating conductor 1 and the grounding conductor 2 is narrow;
For example, as in the above model, the diameter is 7.5 mm, and the feed wires 5a, 5b, 5c, and 5d are as thin as about 0.3 mm, making it difficult to connect them to the feed circuit 4 and the radiation conductor 1 by soldering, which makes manufacturing difficult. There was a problem.

This idea was made to solve the above-mentioned problems, and the purpose is to obtain a microstrip antenna that can improve vibration resistance, shock resistance, and heat resistance characteristics, and can be manufactured easily. .

[Means for solving problems]

In the microstrip antenna according to this invention, a pin is attached to the radiating conductor to connect the radiating conductor and the feeding circuit, and a pin is also attached to the feeding circuit, and the feeding wire is connected to the pin as a semicircular plate spring. It is connected.

[Effect]

The microstrip antenna according to this invention has significantly improved vibration resistance and shock resistance by using a semi-circular plate spring as the feed line, and is also easy to manufacture.

〔Example〕

1, 2, and 3 are views showing an embodiment of this invention, and numerals 1 to 4 and 7 are exactly the same as the conventional apparatus described above.

Reference numerals 5a, 5b, 5c, and 5d are power supply wires in the form of semicircular plate springs, and 6a, 6b are pins for connecting the power supply wires to the radiation conductor 1 and the power supply circuit.

In the figure, feeding wires 5a, 5b, 5c, and 5d connecting the radiation conductor 1 and the feeding circuit 4 are semicircular arc-shaped plate springs and pins 7a, 7b, and each pin 7a,
7b has slots for narrowing the power supply wires 5a, 5b, 5c, and 5d. Each pin 7a, 7b is connected at one end to the radiation conductor 1 and the feeder circuit 4 by soldering or the like, and the feeder wires 5a, 5b, 5c,
5d is soldered after being squeezed.

As an example, these power supply wires 5a, 5b, 5c,
If 0.06mm thick beryllium katsupa is selected as the conductive spring material for 5d, and the diameter of the semicircular arc is 5.5mm, then
In the case of the same analytical model as the conventional example, the maximum generated stress σmax is 3.2 Kg ^f /mm ² , and even if fatigue of the material is taken into account, it can withstand repeated stress of 10 ⁷ times or more. Therefore, in this case, it has a structure that can withstand about 30 Grms at a random vibration level, which improves not only vibration resistance but also impact resistance, and can also cope with thermal changes.

Further, during manufacture, the structure is such that it is squeezed into the pins 6a and 6b attached to the radiation conductor 1 and the feeder circuit 4, and since the feeder wire has spring properties, it can be squeezed in, making assembly simple.

In the above embodiment, a microstrip antenna having four feeding points using four feeding wires is shown, but the number of feeding points is not limited to this.

Further, in the above embodiments, the radiation conductor and the ground conductor are shown as circular shapes, but a rectangular shape or the like can also have the same effect.

Further, in the above embodiment, the direction of the arc of the power supply wire faces the holding post, but the same effect can be obtained even if the direction of the arc is directed in the opposite direction.

[Effect of idea]

As described above, according to this invention, since the power supply wire is configured like a semi-circular plate spring, vibration resistance and impact resistance can be improved, and a device with high heat resistance characteristics can be obtained. In addition, since it is easy to manufacture, an array antenna in which a plurality of antennas are arranged can be manufactured at a low cost.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of this invention, Fig. 2 is a side view showing an embodiment of this invention, Fig. 3 is a detailed view of the vicinity of the power supply wire showing an embodiment of this invention; FIG. 4 is a plan view showing a conventional microstrip antenna, and FIG. 5 is a side view showing the conventional microstrip antenna. In the figure, 1 is a radiation conductor, 2 is a ground plane, 3 is a holding rod, 4 is a power supply circuit, 5 is a power supply wire, 6 is a pin, and 7 is a connector. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a microstrip antenna, the radiating conductor is fixed on the ground conductor with a holding conductor attached to the center of the radiating conductor, and the feeding circuit in the lower part of the ground conductor and the above radiating conductor are connected by a feeding wire, and the feeding wire is connected in a semicircle. A microstrip antenna characterized by an arc-shaped leaf spring.