>>12173917rf engineering is a broad, challenging, and rewarding subject.
central to rf is the study of electromagnetism. the first step to mastering rf is knowing maxwell's equations in matter well. a thorough understaning of maxwell's equations requires knowing linear algebra, vector calculus, ordinary and partial differential equations, analysis, and basic mechanics. Griffiths is a great introductory text to em. if it seems overwhelming, don't worry, that's normal.
once you get good at em, then you need to study advanced electromagnetics (read Balanis) to learn about antenna engineering.
Microwave circuits are the other thing you want to read about. Pozar is a great resource. You can learn how to make circuits by shaping circuits in funny ways, and how to make transceivers etc.
Mix in a class in computational electromagnetics so you can understand finite element analysis and other simluation methods, a class in signal processing, another class in inverse problems, and you'll be fucking unstoppable.
Also metamaterials are easy to make in the rf/microwave/mmwave
there is a lot to learn, but go for it
