Composite material for dielectric lens antennas

DETAILED DESCRIPTION Therefore, it is a principal object of the present invention to provide a dielectric lens antenna composite material which can afford a dielectric lens antenna having a high dielectric constant by controlling the dielectric constant and superior moldability and workability and further good shock resistance.
It is another object of the invention to provide a dielectric lens antenna composite material which can afford a dielectric lens antenna having a large mechanical quality factor in a high frequency range in addition to the above object.
This invention provides a dielectric lens antenna composite material which contains 3-70 percent by volume of a high dielectric constant ceramic and 30-97 percent by volume of a macromolecular material.
The mean particle diameter of the high dielectric constant ceramic is preferably selected to 1-50 .
mu.
m in the above compositions.
It is also preferable that the macromolecular material is a thermoplastic material and its mechanical quality factor is more than 150.
The dielectric constant is varied by changing a mixing ratio of the high dielectric constant ceramic and the macromolecular material.
Further flexibility is caused by using the macromolecular material and injection molding becomes practicable by especially using the thermoplastic macromolecular material.
Further, the dielectric characteristic of the dielectric lens antenna composite material is stabilized by using the high dielectric constant ceramic having a specified mean particle diameter.
In addition, decrease in the antenna gain is minimized by using the thermoplastic macromolecular material having a mechanical quality factor more than 150.
According to the invention the dielectric constant is simply varied by changing a mixing ratio of the high dielectric constant ceramic and the macromolecular material thus the dielectric lens antenna having a high dielectric constant can be obtained.
Further, because of the flexibility of the macromolecular material the dielectric lens antenna can be manufactured, with the injection molding method, by using the dielectric lens antenna composite material and also the dielectric lens antenna having good shock resistance can be obtained through a simple process