JPH052426U - Helical antenna - Google Patents

Abstract

(57) [Summary] [Purpose] In the helical antenna mounted on a satellite, the transmission loss of electromagnetic waves is large due to the presence of a dielectric cylinder, which has been a part of the conventional components, and the electrical characteristics are not good. Yes, there was a need to improve this. [Structure] A camphor cylinder 5 is provided in place of the conventional dielectric cylinder. [Effect] During operation in outer space, the camphor cylinder 5 sublimates and disappears, so that there is an effect that a helical antenna with small electric loss and good electric characteristics can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a trusted antenna that is operated in a high vacuum such as outer space and is mounted on an artificial satellite or the like.

[0002]

[Prior Art]

 FIG. 3 is a diagram showing a conventional helical antenna designed by applying the technology shown in P73 of Antenna Engineering Handbook (published by Ohmsha, Inc.) edited by The Institute of Electronics, Information and Communication Engineers, where 1 is a dielectric. The body cylinder, 2 is a conductor spirally wound around the dielectric cylinder 1, 3 is a reflector provided on a surface perpendicular to the spiral axis of the conductor 2, and 4 is a cable.

The helical antenna thus configured is fed to the conductor 2 from the transmitting section in the satellite via the cable 4 and radiates circularly polarized wave in the direction of the spiral axis of the conductor 2. In addition, the conductor 2 has a defect that it is difficult to maintain its own size and shape on the ground due to its own weight on the ground, and it cannot withstand the vibration load of the launch at the time of satellite launch. It is wound around and held on the cylinder 1.

[0004]

[Problems to be solved by the device]

 As described above, the conventional helical antenna has the structure in which the dielectric cylinder 1 is in close proximity to the conductor 2, so that when the antenna is in operation, the transmission loss of electromagnetic waves propagating through the conductor 2 is large and the electrical characteristics are not good. There was a flaw. In addition, there is a problem that this device cannot be applied in the situation where a higher performance satellite communication antenna is required in the future.

The present invention has been made in order to solve the above problems, and obtains a helical antenna which withstands the vibration load at the time of launching a satellite, has little transmission loss during operation, and has good electric characteristics. The purpose is to

[0006]

[Means for Solving the Problems]

 The helical antenna according to the present invention employs a cylinder formed by a sublimable substance such as camphor instead of the conventional dielectric cylinder.

[0007]

[Action]

 This invention protects the conductor from the vibration load at the time of launching the satellite by forming the cylinder holding the conductor by camphor, and the ambient atmospheric pressure drops significantly after the satellite is put into the space environment. The camphor cylinder rapidly sublimes and diffuses into outer space, and the antenna configuration during operation in outer space consists only of conductors, reflection plates, and cables.

[0008]

【Example】

 Embodiment 1 An embodiment of the present invention will be described below. FIG. 1 is a diagram showing the helical antenna when the device is stored, and FIG. 2 is a diagram showing the helical antenna when the device is operated. In FIGS. 1 and 2, 2 is a spirally-shaped conductor, 3 is a reflector provided on a plane perpendicular to the spiral axis of the conductor 2, 4 is a cable, and 5 is a conductor. It is a camphor cylinder. In the helical antenna configured as described above, the size and shape of the camphor cylinder 5 should be set in consideration of the amount of sublimation in the atmosphere.

The helical antenna and the camphor cylinder 5 according to the present invention hold the conductor 2 to prevent the conductor 2 from being deformed on the ground due to its own weight, and at the time of launching the satellite, the conductor due to the launching vibration load. The damage of 2 can be prevented. Also, after the satellite is put into outer space, the camphor cylinder 5 rapidly sublimes and diffuses due to the decrease in ambient pressure, and the state shown in FIG. 2 is reached. Only the reflector 3 and the cable 4 will be used. In the orbit of the satellite, it is not necessary to hold the conductor 2 because gravity and other loads that affect the device are not applied.

In the above embodiment, the case of the clockwise spiral conductor was shown, but the structure of the counterclockwise spiral conductor, the spiral conductors of both rotations, and further the multi-winding helical antenna, etc. The same effect can be obtained even when applied to the device. Further, in the above-mentioned examples, an example in which camphor is applied to the cylindrical material has been shown, but similar effects can be expected if a sublimable substance such as naphthalene or iodine is used in addition to camphor.

[0011]

[Effect of the device]

 As described above, according to the present invention, since the helical conductor of the helical antenna is held by the camphor cylinder, it is possible to withstand the vibration load of the satellite launch and to reduce the transmission loss during operation in outer space. The effect is that a small product with good electrical characteristics can be obtained.

[0012]

[Brief description of drawings]

FIG. 1 is a diagram showing a helical antenna according to an embodiment of the present invention when it is stored.

FIG. 2 is a diagram showing the operation of the helical antenna according to the embodiment of the present invention.

FIG. 3 is a diagram showing a conventional helical antenna.

[Explanation of symbols]

 1 Dielectric cylinder 2 Conductor 3 Reflector 4 Cable 5 Camphor cylinder

Claims (1)

[Claims for utility model registration] [Claim 1] A cylinder made of camphor, which is a sublimable substance, a spiral conductor formed on the outer periphery of the cylinder, and a conductor perpendicular to the spiral axis of the conductor. A helical antenna, characterized in that it is composed of a reflector.