Patent ID: 9641211
Date: 2017-05-02
CPC Classifications: H04B

Claim:
1. A mobile communication device, comprising: a case, comprising a metal backing plate, the metal backing plate comprising a radiation part and a non-radiation part, wherein the radiation part is insulated against the non-radiation part; an antenna, disposed inside the case and comprising a first feed point; a plurality of filters, electrically connected and disposed between the metal backing plate and the antenna, each of the filters comprising: a capacitor, wherein one end of the capacitor of each of the filters is connected to the antenna and the other end of the capacitor of each of the filters is grounded; and an inductor, connected to the capacitor in parallel, wherein one end of the inductor of each of the filters is connected to the antenna and the other end of the inductor of each of the filters is connected to the radiation part such that the radiation part of the metal backing plate and the antenna collectively induce a magnetic field when a radio frequency signal is fed from the first feed point.