Upvote:2
Your situation is that you are visiting someone already in Germany; so you need to apply for the appropriate visa type.
The family reunion visa you mention is for permanent residents of Germany that wish to bring their family members to reside with them permanently in Germany.
Your husband probably has a German National Visa (which is for longer term stays, like for study).
The types of (short stay) visas are listed at the embassy's website, along with their requirements.
From that list, for the purpose of your visit - you need to apply for a visit visa, the requirements for which are listed on this pdf.