Amplifiers operating with bandwidths like the one you have are typically designed in so called distributed amplifier topology. Look for the topic in the literature as it is not trivial to explain without pictures and a lot of words. You can use the following books:
Virdee B., Virdee A., and Banyamin B. – Broadband Microwave Amplifiers, Artech House, 2004
Wong T. Y. – Fundamentals of Distributed Amplification, Artech House, 1993