Radiofrequency Impedance Matching at 1 and 10 Mega Hertz
Mentor:Oscar Bernal, Professor of Physics, California State University Los Angeles
The lack of impedance matching between source and load in a transmitter/receiver system such as nuclear magnetic resonance spectrometers leads to poor efficiency of power transfer and frequent signal reflections that make it difficult for the receiver to accurately detect the desired signal. This contribution presents an effective optimal design of a network of capacitors, resistors, and inductors along with a set of formulae that can be modified to match a given known load to its source at a desired range of radiofrequencies. It also presents an analysis into the effect a large inductance can cause. The impedance matching design presented is based on two combined "L-Type" sections that have been simplified for noise reduction. This approach has been validated by the construction of two different networks and tested by the use of a network analyzer at the frequencies of 1 and 10 Mega Hertz respectively. The design and results presented will add knowledge on the topic of impedance matching and solutions to solving problems involving transmission lines.