JPH0260210A - Antenna device - Google Patents

Abstract

PURPOSE:To facilitate the switching of polarization, to miniaturize and lighten the title device and to reduce cost by constituting a frequency converter through the use of a micro wave integrated circuit where two antenna elements of a right-circularly polarized wave and a left-circularly polarized wave or a vertical polarized wave and a horizontal polarized wave are provided and making it movable. CONSTITUTION:A fitting adapter 32 fixes the frequency converter 1 by a screw stopper and the like in a position vertically shifted as illustrated as arrows in such a way that either of two primary radiators is positioned in the focus of a parabolic reflector 2. On the other hand, the frequency converter 1 is constituted so that it can be fixed with the fitting adapter 32. Thus, the frequency converter 1 is fixed by vertically shifting it. Thus, either of the two primary radiators is shifted to the position of the focus of the parabolic reflector 2, and the primary reflector which has been set in the position of the focus of the parabolic reflector 2 is simultaneously caused to be an ON state, whereby a polarization surface is switched.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an antenna device, and more particularly to an antenna device that has a polarization plane switching function and is used in microwave reception systems and microwave transmission systems such as satellite broadcasting.

[Conventional technology]

Conventionally, this type of polarization switching antenna uses ferrite and switches the polarization plane by changing the magnetic field applied to the ferrite by controlling the current of an electromagnet, or has vertical and horizontal horn radiators. A method is used in which the output of each horn is introduced behind the antenna using a waveguide, and then the output of the waveguide is switched using an RF switch.

[Problem to be solved by the invention]

The above-described conventional polarization-switchable antenna device has the disadvantages of high power consumption, large loss due to large device size, and high price.

An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a small, lightweight, and inexpensive antenna device that consumes less current and has less loss.

[Means to solve the problem]

The antenna device of the present invention is provided with two primary radiators that form vertically polarized waves and horizontally polarized waves of right-handed circularly polarized waves, left-handed circularly polarized waves, or linearly polarized waves with antenna elements including at least a microstrip antenna element. a parabolic reflector that transmits and receives radio waves using either of the two primary radiators; and a frequency converter that converts the frequency so that one of the two primary radiators is held at the focal position of the parabolic reflector. and a support portion that movably supports the parabolic reflector.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the antenna device of the present invention. The antenna device of the embodiment shown in FIG. 1 has two primary antenna elements that form right-handed circularly polarized waves, left-handed circularly polarized waves, or linearly polarized vertically polarized waves and horizontally polarized waves by antenna elements including at least a microstrip antenna element. A frequency converter 1 equipped with a radiator, and a parabolic reflector 2 that transmits and receives radio waves using either of the two primary radiators of the frequency converter 1.
, a support part 3 that supports the frequency converter 1 movably with respect to the parabolic reflector 2 so that either of the two primary radiators of the frequency converter 1 is held at the focal position of the parabolic reflector 2. The support part 3 includes a support stand 31 that supports the frequency converter 1 and the parabolic reflector 2, and a support stand 31 that supports the frequency converter 1 and one of the two primary radiators attached to the tip of the support stand 31 as shown by arrows. The parabolic reflector 2 includes a mounting adapter 32 for moving and holding the parabolic reflector 2 so as to be positioned at the focal point of the parabolic reflector 2, and a support 33.

In the embodiment shown in FIG. 1, the two primary radiators are formed using microstrip antenna elements, and utilize right-handed and left-handed circular polarization types.

The mounting adapter 3.2 has a structure in which the frequency converter 1 is fixed with screws or the like in a position shifted from side to side as shown by the arrow so that one of its two primary radiators is located at the focal point of the parabolic reflector 2. , while the frequency converter 1
It also has a structure that allows it to be fixed with the mounting adapter 32.

In this way, by shifting the frequency converter left and right and fixing it, one of the two primary radiators can be moved to the focal point position of the parabolic reflector 2, and at the same time the primary radiator set at the focal point position of the parabolic reflector 2 can be moved to the focal position of the parabolic reflector 2. By turning on the radiator, the plane of polarization is switched.

FIG. 2 is a plan view of a microwave integrated circuit mounted on the frequency converter of the embodiment shown in FIG. Antenna elements 4a, 4
b has both primary radiators for right-handed circularly polarized waves and left-handed circularly polarized waves. The upper surface is divided into a radiation opening 5 made of glass or plastic through which radio waves pass, and a case 6 whose inside is metalized for UV protection. The two antenna elements 4a and 4b control this microwave integrated circuit from the outside, and one of them is turned on.

In the above explanation, circular polarization switching has been described, but it is clear that linear polarization switching can be performed if the radiator (antenna element) is linearly polarized and arranged as horizontal and vertical antenna elements.

〔Effect of the invention〕

As explained above, according to the present invention, a frequency converter is configured using a microwave integrated circuit provided with two antenna elements for right-handed circularly polarized waves and left-handed circularly polarized waves, or vertically polarized waves and horizontally polarized waves. However, by making this movable, the antenna device can realize a polarization plane switching function that is small, lightweight, and inexpensive and allows easy polarization switching.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the antenna device of the present invention, and FIG. 2 is a plan view of a microwave integrated circuit mounted on the frequency converter of the embodiment of FIG. 1... Frequency converter, 2... Parabolic reflector,
3... Support part, 4a, 4b... Antenna element, 5...
...Radiation opening, 6...Case, 7...Terminal, 31
...Support stand, 2...Mounting adapter, 3...Strut.

Claims (1)

[Claims] a frequency converter provided with two primary radiators that form right-handed circularly polarized waves, left-handed circularly polarized waves, or linearly polarized vertically polarized waves and horizontally polarized waves with an antenna element including at least a microstrip antenna element; a parabolic reflector that transmits and receives radio waves using one of two primary radiators, and a frequency converter that is connected to the parabolic reflector so that one of the two primary radiators is held at the focal position of the parabolic reflector. An antenna device comprising: a support portion movably supporting the antenna device.