Abstract: A multi-frequency antenna includes a first antenna element having a first antenna member for receiving and transmitting signals in a first frequency band and a second antenna member for receiving and transmitting signals in a second frequency band. The first antenna member has opposite first and second ends. The second antenna member has opposite third and fourth ends respectively disposed adjacent to and remote from the first end of the first antenna member. The fourth end of the second antenna member is connected electrically to the first end of the first antenna member so as to form a feed point. A C-shaped second antenna element has opposite ends, one of which is connected electrically to the third end of the second antenna member of the first antenna element.

Abstract: A built-in multi-band mobile phone antenna assembly includes a patch antenna, a loop antenna disposed adjacent to the patch antenna, and a parasitic element disposed adjacent to both the patch antenna and the loop antenna and coupled parasitically to the patch antenna.

Abstract: A built-in multi-band mobile phone antenna assembly includes apatch antenna, a loop antenna disposed adjacent to the patch antenna, and a parasitic element disposed adjacent to both the patch antenna and the loop antenna and coupled parasitically to the patch antenna.

Abstract: A low-radiation mobile phone includes an electrical circuit board, which is disposed within a housing and which includes a circuit board, an antenna in electrical connection with the circuit board for serving as one electromagnetic radiating source, and a conductive piece that has a grounding end in electrical connection with a grounding point of the circuit board, and a radiating end for serving as another electromagnetic radiating source. Because there are two electromagnetic radiating sources in the mobile phone, the Specific Absorption Rate of the mobile phone and thus the harmful effect of the electromagnetic radiation of the mobile phone on a human body can be reduced.

Abstract: A built-in multi-band mobile phone antenna includes: a meandering conductive body having a signal feeding point, and first and second meandering conductive portions disposed at two sides of the signal feeding point; a conductive flat first radiating plate in electrical connection with the first meandering conductive portion and tuned to a low frequency range; an elongated conductive flat second radiating plate in electrical connection with the second meandering conductive portion and a grounding point and tuned to a high frequency range; and a conductive flat parasitic plate in electrical connection with the grounding point so as to widen the bandwidth of the antenna. The conductive body, the first and second radiating plates, and the parasitic plate define cooperatively a plate-shaped accommodating space thereamong for receiving a plate-shaped electronic element.