Computer Aided Design of Stub Tuners for Impedance Matching

Technical Report · Mon Sep 01 00:00:00 EDT 2003

DOI:https://doi.org/10.2172/1061699· OSTI ID:1061699

Zheng, S. ^[1]; Brennan, J. M. ^[1]

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1. Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)

In RF and microwave circuit design, a common situation is to match a load with arbitrary impedance $$Z_L$$ to an input circuit with a different impedance $$Z_S$$. Several techniques for this impedance matching are available. Among them, quarter wavelength transmission line with characteristic impedance given by $$Z_0 = \sqrt{Z_LZ_S}$$ is well known. This method, however, is difficult to implement in high power applications since Z0 obtained from the impedance equation is usually a non-standard value. Another matching technique, namely stub tuner, can be used to solve the problem. This method uses two pieces of transmission lines, thus the impedance of the matching transmission lines can be arbitrarily chosen and commercially available cables are usually used to form the matching network. This stub tuner was proposed to replace the old quarter wavelength matching cable in the RHIC 28 MHz accelerating PA input circuits. The design of the stub tuner using MATLAB is given in this note.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1061699
• Report Number(s): BNL--99258-2013-IR; C-A/AP/106; KB0202011
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
Relativistic Heavy Ion Collider