Working principle of planar antenna waveguide


Release time:

2019-09-27

Working principle of planar antenna waveguide

Before talking about the working principle of the slot plate antenna, let us understand the situation of the waveguide. Waveguides are cavity-shaped conductors made of metal materials with different shapes and enclosed inside and outside to transmit signals. They include circular waveguides, elliptical waveguides, square waveguides, rectangular waveguides, etc., as shown in the figure. At present, the commonly used front-end cavity of the high-frequency head is a circular waveguide, and the feed part of the single-polarized high-frequency head is a rectangular waveguide. Waveguide is actually a transmission of ultra-high frequency signal a microwave signal wire (body), when the transmission of the signal frequency is low, you can use ordinary wire transmission. When the frequency of the transmission signal is high, the attenuation of the ordinary wire will be very large, and it will have to be transmitted by cable, and the transmission attenuation of the cable will be smaller. When the transmission frequency is high, such as microwave, at the same time, it is hoped that the attenuation of the transmission is very small, at this time, the waveguide must be used to transmit, its transmission attenuation is very small, much smaller than the cable attenuation. Therefore, in high-end products, such as communication systems, waveguide transmission is commonly used. At the same time, the standing wave ratio of the waveguide is good, and the reflection is small, which can ensure that most of the transmitted signals are transmitted from the inlet end to the outlet end. In addition, the waveguide is a closed transmission line, which can completely ensure that a signal transmitted in the waveguide is free from various external interferences, and can also ensure that the signal transmitted in the waveguide will not radiate out of the waveguide, thereby ensuring the quality and quantity of the transmitted signal. It should be emphasized that the microwave signal transmitted in the waveguide is in the form of a field.

Keywords: digital TV antenna, vehicle antenna, RF line/feeder, suction cup antenna