Gap feeding yagi antenna

Abstract

A slot feeding Yagi antenna comprises a cable, a reflection element, an active vibrator and at least one directing element. Wherein, a half-wave vibrator is provided as the active vibrator. A shielded slot structure serves as a feeding part of the Yagi antenna and is composed of a metal cylinder embedded into a support tube and centrally provided with a thru slot and a support tube in a corresponding position of the metal cylinder, or a slot on the support tube and a metal shield correspondingly arranged on the slot. The slot is filled with insulating medium and takes a shape of beeline, letter S or arch. The present invention discards a folded vibrator commonly applied to Yagi antenna, utilizes a half-wave vibrator as the active vibrator, realizes feeding with the slot and provides gaining and front-to-rear ratio superior to the folded vibrator on the premise of the same size according to simulating test and examination, thus saving production cost and reducing space occupied by the antenna under condition of guaranteed gaining and front-to-rear ratio.

Description

【Technical field】 [0001] The invention relates to the field of communication, in particular to a Yagi antenna with a new feeding structure in the field of microwave communication. 【Background technique】 [0002] In the 1920s, Yagi Hideji and Uda Taro of Tohoku University in Japan invented an antenna, which was later called "Yagi-Uda antenna", or "Yagi antenna" for short. Because the Yagi antenna has good directivity and higher gain than the dipole antenna, it is especially effective for direction finding and long-distance communication, so it is still widely used now. A typical Yagi antenna should have three pairs of vibrators, and the entire structure is in the shape of a "king". The active vibrator connected to the cable is called the active vibrator, or the main vibrator, which is among the three pairs of vibrators, and there is a horizontal line in the middle of the word "Wang". A reflector that is slightly longer than the active vibrator is called a reflector, and it ...

AI Technical Summary

Problems solved by technology

The Yagi antenna that uses the half-wave folded vibrator as the active vibrator mainly uses the structure of the Yagi antenna itself, such as the simple penetrating feed method. The tube crosses the feed point to connect the inner conductor of the cable to the folded vibrator on the opposite side. Due to structural limitations, if a higher gain and front-to-back ratio are required, this Yagi antenna needs to be large enough, resulting in production costs and occupation. increase in space

The half-wave symmetrical vibrator is also called the half-wave vibrator. Due to the restriction of its own impedance characteristics in the Yagi antenna, it is usually used on the self-made Yagi antenna for civilian use, which cannot meet the parameter requirements of the engineering antenna.

Images