Feed source device and microwave antenna

Abstract

The invention provides a feed source device and a microwave antenna, applicable to the field of antennae. The feed source device comprises a waveguide tube, a dielectric medium inserted at one end of the waveguide tube and an auxiliary reflecting surface nested on the internal surface of the dielectric medium. The feed source device also comprises a matching medium coating the periphery of the dielectric medium, and the dielectric constant and the thickness of the matching medium are respectively disclosed in the specifications, wherein epsilon r is the dielectric constant of the dielectric medium 20, a is a constant coefficient between 0.5 and 3.5, and lambda is the wavelength of electromagnetic waves in vacuum. Through the feed source device and the microwave antenna provided by the invention, the reflection of the external surface of the dielectric medium to the electromagnetic waves can be greatly reduced by means of the added matching medium, the deterioration of standing-wave ratio caused by waves reflected by the external surface of the dielectric medium is basically eliminated, and the limitation to the material selection of the dielectric medium is also lowered.

Description

technical field [0001] The invention belongs to the field of antennas, in particular to a feed device and a microwave antenna. Background technique [0002] In the prior art, common feed devices such as figure 1 As shown, due to the reflection of the electromagnetic wave on the outer surface of the dielectric 10, the signal is directly reflected into the waveguide, which destroys the electrical performance of the feed device, resulting in such as Figure 4 As shown, the standing wave ratio of the microwave antenna using this feed device is relatively high; and due to the requirements of low loss, low dielectric constant, and reliable electroplating properties of the dielectric, there are great restrictions on the selection of dielectric materials. [0003] To sum up, the feed device in the prior art will cause the standing wave ratio of the antenna to which the feed device is applied to be relatively high, and the material selection of the dielectric has great restrictions....

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Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a feed device, aiming to solve the problem that the feed device in the prior art will cause the standing wave ratio of the antenna using the feed device to be high, and the material selection of the dielectric has great restrictions The problem

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