Multiband closed metal ring antenna and equipment

The invention relates to a multiband closed metal ring antenna and equipment with the antenna. The antenna comprises a feeder line, a coupling line and a closed metal ring frame, wherein the feeder line is electrically connected to a feeding point of a circuit board, the feeder line is in electromagnetic coupling with the closed metal ring frame, the coupling line is electrically connected with the closed metal ring frame and is in electromagnetic coupling with the feeder line, a first clearance area, a second clearance area and a third clearance area are formed among the feeder line, the coupling line, the closed metal ring frame and the circuit board, the first clearance area and the second clearance area respectively comprise gaps which are positioned between both sides of the circuit board and the corresponding sides of the closed metal ring frame, and the first clearance area and the second clearance area are communicated with each other through the third clearance area which is positioned in the outer side of the top side of the circuit board. According to the antenna, mobile equipment space which adopts the metal frame can be fully used, so that the bandwidth of the antenna is effectively expanded, the performance of the antenna is improved, and the bandwidth of the antenna has highly flexible adjustability.