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A wideband planar dipole antenna comprises a substrate and two antenna bodies. Metal conductor is printed on the single surface/double surfaces of the substrate to form the antenna bodies. With a dipole antenna architecture, the antenna bodies are manufactured as loop structures similar to concentri

A wideband planar dipole antenna comprises a substrate and two antenna bodies. Metal conductor is printed on the single surface/double surfaces of the substrate to form the antenna bodies. With a dipole antenna architecture, the antenna bodies are manufactured as loop structures similar to concentric circles. The loop structures can be of rectangular or circular shapes. Loops of metal conductors with different lengths resonate to obtain similar but different frequencies. Each path of every antenna body can be finally connected with a metal conductor sheet capable of changing to any shape. Every path can interfere with adjacent paths to achieve the wideband effect. An asymmetric mechanism can be added in one of the antenna bodies. Besides letting the antenna have the resonance effect of the symmetric part, the loop path at the signal source can also be increased to enhance the receiving performance of the antenna.

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We claim: 1. A wideband planar dipole antenna comprising: a substrate; a first antenna body being located on one side of said substrate, said first antenna body being made of a first metal conductor with loops in a multi-loop routing configuration to be used as a radiation area; a second metal cond

We claim: 1. A wideband planar dipole antenna comprising: a substrate; a first antenna body being located on one side of said substrate, said first antenna body being made of a first metal conductor with loops in a multi-loop routing configuration to be used as a radiation area; a second metal conductor wherein one end of each loop of the first metal conductor connects to an end of the second metal conductor, the other end of each loop of the first metal conductor connects to a signal source, and another end of the second metal conductor is opened; a second antenna body being located on one side of said substrate, said second antenna body being made of a third metal conductor with loops in a multi-loop routing configuration to be used as a radiation area; and a fourth metal conductor wherein one end of each loop of the third metal conductor connects to an end of the fourth metal conductor, the other end of each loop of the third metal conductor connects to a ground, and another end of the fourth metal conductor is opened. 2. The wideband planar dipole antenna as claimed in claim 1 further comprising a third antenna body and a fourth antenna body on said substrate, wherein said third and fourth antenna bodies correspond to said first and second antenna bodies to form a double-surface wideband planar dipole antenna. 3. The wideband planar dipole antenna as claimed in claim 1, wherein said first antenna body and said second antenna body are printed on said substrate. 4. The wideband planar dipole antenna as claimed in claim 1, wherein shape of the loops of the first antenna body and shape of the loops of the second antenna body are identical and are selected from a circular polygonal shape, an elliptical shape, a polygonal shape, a star shape, or an irregular shape. 5. The wideband planar dipole antenna as claimed in claim 1, wherein shapes of said second metal conductor and said fourth metal conductor are selected from a circular polygonal shape, an elliptical shape, a polygonal shape, a star shape, or an irregular shape. 6. The wideband planar dipole antenna as claimed in claim 1, wherein said substrate is made of glass, ceramic or silicon. 7. A wideband planar dipole antenna comprising: a substrate; a first antenna body used as a signal source, said first antenna body being located on one side of said substrate, said first antenna body being made of a first metal conductor with loops in a multi-loop routing configuration to be used as a radiation area; a first end of a second metal conductor connects the loops of said first antenna body, a second end of said second metal conductor having conductive element connected to said signal source, and a third end of said second metal conductor is opened; a second antenna body being located on one side of said substrate, said second antenna body being made of a third metal conductor with loops in a multi-loop routing configuration to be used as a radiation area; and a fourth metal conductor wherein one end of each loop of the third metal conductor connects to an end of the fourth metal conductor, and the other end of each loop of the third metal conductor connects to a ground. 8. The wideband planar dipole antenna as claimed in claim 7 further comprising a third antenna body and a fourth antenna body on said substrate, wherein said third and fourth antenna bodies correspond to said first and second antenna bodies to form a double-surface wideband planar dipole antenna. 9. The wideband planar dipole antenna as claimed in claim 7, wherein said first antenna body and said second antenna body are printed on said substrate. 10. The wideband planar dipole antenna as claimed in claim 7, wherein shapes of the loops of the first and second antenna bodies are identical and are selected from a circular polygonal shape, an elliptical shape, a polygonal shape, a star shape, or an irregular shape. 11. The wideband planar dipole antenna as claimed in claim 7, wherein shapes of said second metal conductor and said fourth metal conductor are selected from a circular polygonal shape, an elliptical shape, a polygonal shape, a star shape, or an irregular shape. 12. The wideband planar dipole antenna as claimed in claim 7, wherein said substrate is made of glass, ceramic or silicon.