Abstract: A tag antenna comprises a feeder comprising a first conducting wire and a second conducting wire; a first electric conductor, a second electric conductor, and a third electric conductor that are elongated; a first connecting conductor; and a second connecting conductor. The first connecting conductor is separately connected to lower ends of the first electric conductor, the second electric conductor, and the third electric conductor; the second connecting conductor is connected to at least one of the first electric conductor, the second electric conductor, and the third electric conductor; and the first connecting conductor and the second connecting conductor are spaced apart, the first conducting wire of the feeder is connected to the first connecting conductor, and the second conducting wire is connected to the second connecting conductor. The embodiments of the present disclosure further provide a passive temperature detection apparatus.

Abstract: A tag antenna comprises a feeder comprising a first conducting wire and a second conducting wire; a first electric conductor, a second electric conductor, and a third electric conductor that are elongated; a first connecting conductor; and a second connecting conductor. The first connecting conductor is separately connected to lower ends of the first electric conductor, the second electric conductor, and the third electric conductor; the second connecting conductor is connected to at least one of the first electric conductor, the second electric conductor, and the third electric conductor; and the first connecting conductor and the second connecting conductor are spaced apart, the first conducting wire of the feeder is connected to the first connecting conductor, and the second conducting wire is connected to the second connecting conductor. The embodiments of the present disclosure further provide a passive temperature detection apparatus.