ESP-01 not responding to AT command

It’s first time for me to use ESP-01 module. I am trying to test new module, using a serial monitor software ‘AccessPort’ / putty.
Coming to my point directly, when i reset the module by connecting RST pin to ground, i get following message

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Ai-Thinker Technology Co. Ltd.

ready "

Here i was expected that getting ready word(Even after garbage) means everything fine. But problem is module is not replying ‘OK’ on sending ‘AT’.
When i send ‘AT’ it replies ‘ATAT’. Whatever i am sending it, It is replying double word. Means suppose if i send my name ‘YOGESH’ it is replying ‘YOGESHYOGESH’

Used Baud rate is: 115200, I also tried different baud rates.
USB to TTL converter CP2120 is used to interfacing with PC

I don’t know, where i am doing wrong? :confused: :confused: or the module is faulty??

, I also tried different baud rates.

Even 78400?