How to improve LNA gain ?

Hello to all,I have designed a Single ended LNA for 5.2GHz with Fmin of 2.3dB.But at the output i am getting only 4dB gain that is S21 value.Please tell me the procedure how to improve it to get 17dB.

Thanks.

you can use some MMIC, say Hittite component, to easily get NF<2.3dB and Gain>17dB. say HMC753LP4E

But i have to use only CMOS transistor and i don't have chance to use any other design components.

then you can use two-stages for achieve 17dB gain, the 1st stage should have less NF and gain about 8~10dB, and 2nd stage should have more gain and higher NF.

It is not possible to get 17dB with single ended.As i am very much new to analog design so i am facing problems.