SHORTWAVE ANTENNA HAVING UNIFORM INPUT IMPEDANCE IN FREQUENCY RANGE OF 1 MHZ TO 8 MHZ

摘要

A shortwave antenna having uniform input impedance in the frequency range of 1 MHz to 8 MHz, comprising a main rod body and a support frame arranged at the bottom of the main rod body, and characterized in that: the main rod body is a sectioned load antenna, comprising an upper part rod, a middle part rod, and a lower part rod; an inductance coil is added at the middle position between the upper part rod and the middle part rod, a circular groove is provided at the middle position between the upper part rod and the middle part rod, the diameter of the circular groove is identical to the diameter of the inductance coil, the inductance coil is embedded into the main rod body from the circular groove, a protection layer is provided between the upper part rod and the middle part rod and covers the surface of the main rod body, and a press cover is connected to the protection layer. The employment of the measure in which the inductance coil is added on the antenna improves current distribution on the antenna, thus increasing the radiation efficiency of the shortwave antenna; reactance and resistance components are sectionally connected on the antenna, thus allowing an input impedance and a direction diagram in a vertical surface to vary only slightly in a very broad frequency range, implementing the expansion of a receiving bandwidth, and employing a field-circuit co-simulation method for designing.