Antenna feeding structure and antenna

An antenna feeding structure for excitation of an antenna radiator, the structure comprising:

• a first loop containing a feeding unit and a capacitive element;
• a second loop containing the capacitive element and an inductive element connected to both ends of the capacitive element;
• and
• a third loop containing the feeding unit and a conducting line, wherein a resonance frequency of the second loop is controlled by an area of the second loop, an inductance value of the inductive element and a capacitance value of the capacitive element, and the area of the second loop, the inductance value, and the capacitance value are selected such that the resonance frequency of the second loop is within a desired frequency band.

An antenna having an antenna feeding structure for excitation of an antenna radiator, the antenna comprising:

• a feeding unit;
• the antenna radiator;
• and
• the antenna feeding structure, wherein the antenna feeding structure includes:
• a first loop containing the feeding unit and a capacitive element;
• a second loop containing the capacitive element and a conducting line directly connecting both ends of the capacitive element;
• and
• a third loop containing the feeding unit and the conducting line, wherein a band of the antenna is controlled by an area of the second loop, wherein the area of the second loop and a capacitance value of the capacitive element are selected such that a resonance frequency of the second loop is within a desired frequency band of the antenna.