Transmission Lines: Reflection Coefficient vs Frequency

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The discussion focuses on the relationship between the reflection coefficient and frequency in transmission lines. A user highlights a resource for studying transmission lines, particularly for understanding Smith charts. They express confusion regarding how reflection coefficients vary with frequency, noting that while the dependence is weak for long, low-frequency signals, it becomes significant at higher frequencies like 1 GHz. The conversation seeks insights on how to better understand this relationship for load matching. Understanding the reflection coefficient's frequency dependence is crucial for effective transmission line design.
clubgitmo
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Hey guys - I've been using this website to study transmission lines. (great study aid - posting for others to use. Great for smith charts) However, I've noticed this graph they have for load matching:

upload_2014-11-17_10-26-5.png


I'm having trouble finding or understanding a relationship for reflection vs frequency. I've never used frequency for a reflection coefficient, but clearly there is a relationship. Even for an all real load. Can someone share some wisdom?
 
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Reflection coefficient is some function of frequency too. Apparently it's dependence vs frequency is weak for long, low frequency signals and can be taken for constant. But 1 Ghz...this frequency is pretty high for transmission lines.
 

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