Impedance standard apparatus

• US 3,970,973 A
• Filed: 09/25/1974
• Issued: 07/20/1976
• Est. Priority Date: 09/25/1974
• Status: Expired due to Term

• Current Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Lazzaro, Frank
• Primary Examiner(s): Smith, Alfred E.
• Assistant Examiner(s): Nussbaum, Marvin
• Application Number:
  US05/509,200
• Time in Patent Office: 664 Days
• Field of Search: 333/34, 333/97 R, 333/98 R, 324/58 R, 324/58 A, 324/58 B
• US Class Current: 333/245
• CPC Class Codes: H01P 5/024 between hollow waveguides
• CPC Class Codes: H01P 5/026 between coaxial lines

Abstract

An impedance standard apparatus for providing a mathematically predictable voltage standing wave ratio between a matched generator and load.

Claims

1. An impedance standard apparatus for producing known reflections comprising in combination:

taper forming means having a predetermined length, said taper forming means having a first and second end, said first and second end respectively having the same cross-sectional area and shape, said first end having a first predetermined dimension, said second end having a second predetermined dimension, said first predetermined dimension being larger than said second predetermined dimension, said taper forming means with said first and second end provides a two-port device with a mathematically predictable VSWR, said two-port device being inserted between a matched generator and load, and

means for connecting joined to said taper forming means, said connecting means attached to said first and second end respectively of said taper forming means, said connecting means being substantially identical.

2. An impedance standard apparatus as described in claim 1 wherein said taper forming means has a linear taper.

3. An impedance standard apparatus as described in claim 1 wherein said taper forming means has a non-linear taper.

4. An impedance standard apparatus as described in claim 1 wherein said predetermined length is related to the operating frequency range.

5. An impedance standard apparatus as described in claim 1 wherein said taper forming means produces a predetermined reflection within the operating frequency range.

6. An impedance standard apparatus as described in claim 1 wherein said taper forming means produces a predetermined known reflection over the entire operating frequency range.

7. An impedance standard apparatus as described in claim 1 wherein said predetermined length and said first and second predetermined dimension are scaled in relation to the frequency band of operation.