Waveguide flat array antenna

Abstract

The invention provides a waveguide flat array antenna, which has the characteristics of broadband and high-efficiency feed. Rectangular open waveguides 11 are used as radiation units; four rectangular open waveguides in one group form a sub array, and are arranged in a 2*2 rectangle and supplied with broadband equal-amplitude in-phase feed by a rectangular cavity 21; and in order to ensure efficient transmission of electromagnetic wave, the joint of each rectangular open waveguide 11 and the rectangular cavity 21 is provided with matched steps 13 and 23. The center of the rectangular cavity 21 is provided with a rectangular window 22 which is connected with a feed network of the next layer. In order to ensure smooth signals, a rectangular matching block 42 is arranged at the feed network corner connected with each rectangular window 22. The feed network consists of multistage parallel E-T so as to ensure that the antenna has enough bandwidth. The transceiving capacity of circularly polarized wave is realized by arranging a circularly polarized cover. Compared with the conventional flat antenna, the waveguide flat array antenna has broader bandwidth and higher feed efficiency.

Description

technical field [0001] The invention relates to a waveguide plate array antenna, which has the advantages of wide working frequency band and high efficiency. After installing the circular polarization cover 1, the circular polarization receiving and transmitting characteristics can also be realized. Background technique [0002] Antenna gain and bandwidth are very important indicators in communication, radar and other systems. The microstrip panel antenna generally forms a feeding network by microstrip, stripline, etc., and the radiation unit usually chooses a microstrip patch, a slot, etc., and the panel antenna composed of a dielectric material, when the frequency increases (especially X~Ka Band), the feed loss increases rapidly, seriously affecting the gain. There are two types of waveguide slot arrays: standing wave arrays and traveling wave arrays. Compared with microstrip antennas using printing technology, their manufacturing costs are high. Usually requires a weld...

AI Technical Summary

Problems solved by technology

The microstrip panel antenna generally forms a feeding network by microstrip, stripline, etc., and the radiation unit usually chooses a microstrip patch, a slot, etc., and the panel antenna composed of a dielectric material, when the frequency increases (especially X~Ka band), the feed loss increases rapidly, seriously affecting the gain

There are two main types of waveguide slot arrays: standing wave array and traveling wave array. Compared with microstrip and other antennas using printing technology, their manufacturing costs are high.

Usually requires a welding process and is not easy to mass produce

At the same time, the bandwidth of the standing wave array is limited by the size of the sub-array, which generally does not exceed 10%. Although the bandwidth of the traveling wave array can be greater than 10%, the beam pointing changes with the frequency, and the beam width increases accordingly, and the gain decreases.

It cannot meet the system requirements under fixed installation conditions such as point-to-point communication

At the same time, the presence of absorbing loads at the end of the array further reduces the antenna efficiency

Therefore, in systems requiring broadband and high efficiency, neither of these two types of panel antennas can meet the system requirements at the same time.

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