Double-ellipse helical antenna
A helical antenna and double elliptical technology, applied in the field of handheld mobile communication devices and helical antennas, can solve the problems of complex feeding structure, affecting antenna application, and large volume occupied by the antenna, and achieve simple feeding structure, high gain and volume. small effect
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[0028] According to the purpose of the present invention, the present invention uses two elliptical helical coils with different numbers of turns to form an antenna capable of radiating circularly polarized waves, and adopts a simple single-feed structure.
[0029] For the purpose of this invention, the present invention selects the geometric structure of the helical coil and the relative position of the main helical coil and the parasitic helical coil through theoretical analysis, so that the circular polarization 3dB axial ratio bandwidth is close to 40%. In addition, because the helical structure can be determined through theoretical analysis Therefore, the impedance conversion from the 50 ohm coaxial connector to the antenna input port can be realized with a simple matching structure, and the 10dB input impedance bandwidth can reach about 30%. The design idea of the present invention is introduced in detail below:
[0030] (1) Select the spiral radius and the spacing betw...
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