Your mac is only compatible with Mac-to-Mac airdrop, like mine.
AirDrop system requirements
To share between a Mac and an iPhone, iPad, or iPod touch, you need any of these devices and operating systems:
- Mac from 2012 or later (excluding the mid-2012 Mac Pro) using OS X Yosemite or later
- iPhone, iPad, or iPod touch using iOS 7 or later
To share between Mac computers, both computers must be one of these models:
- MacBook Pro introduced in late 2008 or later, excluding the MacBook Pro (17-inch, Late 2008)
- MacBook Air introduced in late 2010 or later
- MacBook introduced in late 2008 or later, excluding the white MacBook (Late 2008)
- iMac introduced in early 2009 or later
- Mac mini introduced in mid 2010 or later
- Mac Pro introduced in early 2009 (model with AirPort Extreme card) or mid 2010
- iMac Pro (all models)
Use AirDrop on your Mac - Apple Support