Cross dipole, cross dipole module, array antenna, and multiple input multiple output antenna

A cross dipole module comprising a cross dipole for reconfiguring a plurality of frequency bands according to an external control signal and generating polarization,

• wherein the cross dipole comprises:
• a first dipole element comprising a first dipole arranged in a first direction and a second dipole arranged in a second direction crossing the first direction, and corresponding to a first frequency band;
• first and second feed points for applying a signal to the first dipole;
• third and fourth feed points for applying a signal to the second dipole;
• a second dipole element comprising a third dipole connected to the first and second feed points through the first dipole and a fourth dipole connected to the third and fourth feed points through the second dipole, and corresponding to a second frequency band that is lower than the first frequency band;
• and
• a first switch formed between the first dipole element and the second dipole element and selectively conducting by an external control signal.

An array antenna comprising a plurality of cross dipole modules respectively comprising a cross dipole for reconfiguring a plurality of frequency bands,

• wherein the cross dipole comprises:
• a first dipole element comprising a first dipole arranged in a first direction and a second dipole arranged in a second direction crossing the first direction, and corresponding to a first frequency band;
• first and second feed points for applying a signal to the first dipole;
• third and fourth feed points for applying a signal to the second dipole;
• a second dipole element comprising a third dipole connected to the first and second feed points through the first dipole and a fourth dipole connected to the third and fourth feed points through the second dipole, and corresponding to a second frequency band that is lower than the first frequency band;
• and
• a first switch formed between the first dipole element and the second dipole element and selectively conducting by an external control signal.

A multiple input multiple output antenna comprising:

• a plurality of array antennas for inputting/outputting a frequency band or signals having different polarization directions;
• and
• an indoor supporting system for generating a signal for controlling the plurality of array antennas,
• wherein the array antenna comprises a plurality of cross dipole module that are simultaneously controlled,
• the cross dipole module comprises a cross dipole for reconfiguring the plurality of frequency bands and reconfiguring the polarization direction, and
• the cross dipole comprises
• a first dipole element comprising a first dipole arranged in a first direction and a second dipole arranged in a second direction crossing the first direction, and corresponding to a first frequency band,
• first and second feed points for applying a signal to the first dipole,
• third and fourth feed points for applying a signal to the second dipole,
• a second dipole element comprising a third dipole connected to the first and second feed points through the first dipole and a fourth dipole connected to the third and fourth feed points through the second dipole, and corresponding to a second frequency band that is lower than the first frequency band, and
• a first switch formed between the first dipole element and the second dipole element and selectively conducting according to a frequency band at which the cross dipole operates.