The nice thing about phrase search was that you didn't have to close the quotes. You could type ["Dual Polarization Antenna] and Google assumed that you forgot to close the quotes. This was especially useful if you changed your query by adding new words or if you typed the query using a virtual keyboard.
Unfortunately, the trick no longer works and you now have to close the quotes to use phrase search:
At some point, you could even enter queries like [Dual-Polarization-Antenna] and Google returned the same results as if you typed ["Dual Polarization Antenna"].