Delay Line on Ceramic
Original Publication Date: 1988-Jun-01
Included in the Prior Art Database: 2005-Feb-15
An arrangement is described to provide a low cost trimmable delay line with trimming or taps for selecting delays. Fig. 1 shows the serpentine conductor pattern used to generate a length of transmission line used as a delay element. The conductor pattern is placed over a ground plane separated by a dielectric with thickness TD. (Image Omitted) The delay per foot for the structure is: [[[[[[[[[[[[[[[[ tdelay = 1.017 /.475 Er + .67 Where E = relative dielectric constant of the material separating the conductor pattern from the group place. If ceramic is used for the substrate as shown in Fig. 2, a sandwich of two pieces of ceramic and a conducting plane allows delay patterns on both sides of the ceramic, thus two independent delay lines. By using a vertical pattern as shown in Fig.