you must study the courses of the electromagnetics, waves, electronics, about RF concept and some simulations of EM, spice and so on!!
esepically, just to go to experiment to demonstrate your theory are all right~~~~
Unfortunately RF is an area where in order for one to excel it requires lots (years) of experience that isn't printed on any books. Therefore I suggest that you read some of the basic books of course to start with, but then you need someone experienced (e.g. a senior engineer) to guide you through your first designs because there are MANY simple but smart tricks that will make your circuits work properly. Best of luck to you.
It is not a simple task:
1) Know well the theory
2) Simulate, simulate , simulate
3) Stay updated on the market changes
4) jump from company to company trying to have better position
5) As said before : work Hard !!!!
Last : love your work and try to work on the breadboards, because you cannot simulate everything and the surprises appears only when the PCB is in your hands .
thanks to all people give advice here!I feel that i learned some ways... but there are so many fundamental RF books ,how can I select a good or the fittest one from those for beginning?
In the attached link are some of the recommended books for RF / Microwave. You can start off with the book entitled Microwave Engineering. It's a good book.
you have to pass base books in this field.for example electromagnetics, waves, electronics and RF concepts.
then you must learn how to work simulation software .You must pass a lots of experience in this field.