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.

Abstract: A system for detecting temperature during roasting includes a roasting probe and a transmission terminal. The roasting probe includes a temperature sensor and a first wireless transmission component. The temperature sensor is used to detect temperature of the roasting probe. The first wireless transmission component sends the detected temperature to the transmission terminal. The transmission terminal includes a shell, a circuit board arranged in the shell, and a second wireless transmission component and a third wireless transmission component connected to the circuit board. When the transmission terminal is connected to a roasting apparatus, the second wireless transmission component enters the roasting apparatus and is used to receive the temperature sent by the first wireless transmission component located on the roasting probe in the roasting apparatus. The third wireless transmission component is located outside the roasting apparatus and sends the temperature to an external terminal.