Antenna radiation pattern

I have designed simple transmitter at 2.4 GHz (VCO + Amplifier +antenna). I just want to know that my antenna also receiving DC voltage. on output of amplifier, I did not use dc blocking capacitor. Does this voltage effect antenna efficiency or it is required to radiate antenna ? kindly explain,,,,,

It is not really possible for an antenna to receive a DC voltage, except in some extraordinary circumstances in nonuniform E fields. If this is happening, something else is causing the DC offset.

Amplifier is directly attached with Antenna, and antenna taking this voltage from the output of amplifier as I did not use dc blocking capacitor. so in this case radiation will effect or not?

Is this a transmit antenna? If so, the DC bias on the antenna will not affect your radiation pattern unless there is something nonlinear with your antenna. DC does not radiate so the antenna itself is acting like a DC blocking capacitor. If the antenna is a loop type antenna, the DC bias will generate a strong current, cause heating, etc.