Broadband Directional Antenna Based on Resonant Reflector

Abstract

The invention discloses a broadband directional antenna based on a resonant reflector. The broadband directional antenna is mainly composed of a broadband antenna body layer, a resonant reflector layer and a director layer. The resonant reflector layer is arranged exactly below the broadband antenna body layer. The director layer is arranged exactly above the broadband antenna body layer. The broadband antenna body layer comprises a body dielectric substrate, and a main radiation patch and a metal loading ring which are adhered on the body dielectric substrate. The resonant reflector layer comprises a resonant dielectric substrate and a metal resonant ring which is adhered on the resonant dielectric substrate. The director layer comprises a directing dielectric substrate and a metal directing ring which is adhered on the directing dielectric substrate. A higher profile required by loading of a conventional metal reflecting board on the antenna is overcome, and larger area and narrower frequency band required by loading of an AMC structure on the antenna is also overcome so that the broadband directional antenna based on the resonant reflector has dual advantages.

Description

technical field [0001] The invention relates to the field of broadband antennas and directional antennas, in particular to a broadband directional antenna based on a resonant reflector. Background technique [0002] With the progress of society and technology, wireless communication technology has been developed rapidly, and the bandwidth of signals is also continuously improved. Ultra-Wideband (Ultra-Wideband) antennas, as the core components in broadband communication systems, have also been greatly developed. However, UWB antennas have some general disadvantages, such as having to sacrifice gain in order to increase bandwidth; and the pattern will deteriorate at high frequencies, and so on. These shortcomings seriously affect the communication quality. Moreover, ultra-wideband antennas usually radiate omnidirectionally or bidirectionally. With more and more antennas on modern carrier systems, electromagnetic compatibility is a big problem; in fields that require high co...

AI Technical Summary

Problems solved by technology

The above-mentioned antennas have high directivity, but unfortunately, they all have their own shortcomings: the microstrip antenna can achieve good directivity because the metal layer is covered on the other side of the dielectric substrate as the floor, but the metal layer The existence of the microstrip antenna leads to a very narrow impedance bandwidth, usually only about 5%; the Yagi antenna usually has a forward gain of more than 10dBi, but its inherent narrow frequency band and end-fire characteristics limit its application range; logarithmic period Antennas and Vivaldi antennas are frequency-invariant antennas. They have a wide impedance bandwidth and can maintain relatively stable directivity throughout the passband. However, their large size and end-fire characteristics make them suitable for portable applications. No advantages at all; parabolic and horn antennas are also limited in scope due to their relatively large size

Although the above studies have produced a certain degree of orientation through certain methods, their front-to-back ratios are not particularly high, and all these methods are slightly complicated in design

This increases the design cost and is not applicable in some occasions

In addition, these patents cannot meet the requirements of low-profile and miniaturized antennas

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