| 摘要 |
PURPOSE:To adjust the frequency without increasing the propagation loss by forming a thin film of polyimide group resin on a surface wave substrate and changing the film thickness formed in this way. CONSTITUTION:The polyimide group resin forming the thin film is given on the surface wave substrate 1 by a simple device such as a spray gun 4. In using a proper mask 2 in this case, the frequency of the surface wave device is adjusted to a desired part only selectively and the thin film with uniform film thickness is formed. The thickness of the thin film is controlled by adjusting the time of spray. Since the frequency of the surface wave device depends on the film thickness, the frequency is adjusted by changing the film thickness. On the other hand, the thin film made of the polyimide group resin does not almost increase the propagation loss of the surface wave. Then the frequency is adjusted without much increasing the propagation loss.
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