PROTOTYPE MODEL OF AN AUTOMATIC X-BAND MICROWAVE IMPEDANCE RECORDER
A prototype model of an automatic X-band microwave impedance recorder was developed and tested. The design of this unit, manufactured commercially under contract, is based upon an earlier NRL model. The new instrument is neatly packaged in two portable cabinets and, as regards electrical performance, is fast, accurate, broadband, and has a dynamic range of about 40 db. It will accept any impedance which has an X-band waveguide input and will plot either the impedance or admittance upon either a standard or an expanded Smith chant. Amplitude and phase indicators can be located remotely if desired. The impedance terminals of the instrument may be located at any desired point and will remain fixed over the band. In addition to impedance measurements, the instrument is particularly well suited to the measurement of dielectric constant, using the shorted-line method. A chant can be constructed which permits rapid, automatic dielectric constant measurements with accuracy comparable to the Von Hippel slotted-line technique. Loss tangent of dielectric materials can also be measured, and a shorted-line techunique for accomplishing this was developed. With slight modification of the accessible of circuit, the instrument may be adapted to the automatic measurement of transmission coefficient. Also, if a suitable field probe and carriage movement are available, the instrument may be adapted to automatic antenna near-field measurements. (auth)
- Research Organization:
- Naval Research Lab., Washington, D.C.
- NSA Number:
- NSA-14-005336
- OSTI ID:
- 4210822
- Report Number(s):
- NRL-5295; Project NR-411-000
- Resource Relation:
- Other Information: Project NR-411-000. Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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