VCO Design for 1430-2230 MHz, 10 mW Output: Varactor Selection and S-Parameters

Hi,

I have a project to design a VCO which i have difficulties with. Could
someone please help me out? I have the following specifications:
band: 1430 to 2230 MHz
comparison frequency: 7.8125 kHz
VCO output power: 10 mW

I don't know how to find the value of the needed varactors and the s-parameters.

A help or a direction would be much appreciated!