I've designed an amplifier for a small ac signal (amplitude of around 5mV, frequency 252kHz) with a BJT (2N2222.)

The BJT is set up in a common emitter amplifier configuration, with the biasing resistors set up to provide a constant 0.7Vdc to the base. 

I used blocking capacitors C2 and C4 to remove the dc bias by acting as a high pass filter. 

However, even though I designed the circuit to have a voltage gain of 100, with cut off frequency of around 200kHz, I found my ac input signal was still being attenuated. 

By changing the cut off frequency to 20Hz, I achieved a gain of close to 100. However, even by changing the cut off freq to 100kHz, my output signal is still attenuated. 

Why is this?

[![enter image description here](https://i.stack.imgur.com/BHRp3.png)](https://i.stack.imgur.com/BHRp3.png)