| 摘要 |
A coplanar waveguide is formed by a spiral with two arms. One arm is labelled 1, and the second arm is labelled 2. The arms labelled 1 and 2 are separated by equal distance. The spiral arms labelled 1 and 2 are formed by the deposition of a film of a conductor, a third layer, on a film 14 of a single crystal ferroelectric material, a second layer, which is deposited on a single crystal dielectric material, a first layer 1. Input is 10 and the output is 11. The CPW spiral arms labelled 1 and 2 forms a time delay device. When a bias voltage V is applied between the two spiral arms labelled 1 and 2 through a bias filter made of an inductor L and a capacitor C, the permittivity of the ferroelectric film between the two spiral arms labelled 1 and 2, or across the CPW, producing a change in the time delay. By the application of different levels of bias voltage between the two spiral arms labelled 1 and 2, different permittivity of the ferroelectric material are obtained and thus different changes in the time delay are obtained. Thus a variable time delay is obtained. Other delay embodiments are (1) meander line, (2) square shaped structure, (3) interdigital line, (4) parallel CPW.
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