Hello,
I am an electronics and telecommunication engineer and my major is wireless systems' design. So far I have designed many antennas and their related parts such as matching circuits(lumped/distributed), filters(lumped/distributed), power dividers, phase shifters, etc. and I use CST Microwave Studio Suite for most of the design I did hence I am very professional in usage of the program. So I am sure that I can help you. Just give me all the details such as resonant frequency, bandwidth, gain, etc.. and I will do my best to help you.
Best regards