Microwave Tuning Elements

Dielectric Tuning Elements

The use of a dielectric rod (instead of a metallic probe) for the tuning element will provide the lowest loss tuning for high frequency applications. When the dielectric rod is introduced into a microwave cavity it has the effect of making the cavity electrically larger, and lowering the resonant frequency. Dielectric tuning elements are excellent for adjusting the frequency of Gunn diode and IMPATT oscillators.

All dimensions are in/mm.

Notes:

1. Hardware modifications:
   1. For slotted bushing, replace "S" in model number by "L".
   2. For ring nut (instead of hex nut), replace "N" in model number by "R".
   3. For no nut, replace "N" by "F".
2. Rotor adjusting slot is 0.060/1.5 x 0.016/0.41 for bushings where "H" is 0.120-80, 0.13/3.3 x 0.020/0.51 for bushings where "H" is 0.190-64, and 0.16/4.0 x 0.020/0.51 where "H" is 0.234-64.

Engineering Bulletin SG-670 Contents

• Metallic Tuning Elements
• Dielectric Tuning Elements
• Tuning Rotors
• Dielectric Resonator Tuners
• LC Tuning Elements
• Resistive Tuning Elements