Multi band built-in antenna

A multi-band built-in antenna for a mobile communication terminal having a main board and a casing for protecting the main board, the multi-band built-in antenna comprising:

• a transmission line formed to be spaced apart from one outside surface of the main board by a predetermined interval and configured to include an external conductor, a dielectric, and a central conductor so as to transmit signals;
• a ground clip configured to ground the transmission line by fastening the transmission line;
• and
• a radiator formed by bending the dielectric and central conductor of the transmission line, other than the external conductor of the transmission line, and configured to operate in multiple bands.

A multi-band built-in antenna for a mobile communication terminal having a main board and a casing for protecting the main board, the multi-band built-in antenna comprising:

• a transmission line formed to be spaced apart from one outside surface of the main board by a predetermined interval and configured to include an external conductor, a dielectric, and a central conductor so as to transmit signals;
• a ground clip configured to ground the transmission line by connecting the transmission line and the main board;
• a radiator formed by bending the dielectric and central conductor of the transmission line, and configured to operate in multiple bands;
• and
• a second open stub formed on the ground clip.

A multi-band built-in antenna for a mobile communication terminal having a main board and a casing for protecting the main board, the multi-band built-in antenna comprising:

• a transmission line formed along one side of the main board, and configured to include an external conductor, a dielectric, and a central conductor so as to transmit signals;
• a ground clip configured to ground the transmission line by connecting the transmission line and the main board;
• a radiator formed by bending the dielectric and central conductor of the transmission line, and configured to operate in a high frequency band;
• and
• a third open stub connected to the ground clip, bent a plurality of times, and configured to be operated in a low frequency band lower than the high frequency band;
• wherein the radiator is spaced apart from the third open stub by a predetermined interval so as to be parallel thereto, and is configured to perform coupling feeding to the third open stub.