Frequency-reconfigurable microstrip patch yagi antenna and reconstruction method

Abstract

The invention discloses a frequency-reconfigurable microstrip patch yagi antenna, which comprises a three-layer structure. The first layer of the three-layer structure comprises a first dielectric substrate. A coupling microstrip line, a direct current bias circuit and a metal through hole are arranged on the upper surface of the first dielectric substrate. An impedance conversion line, a reflection patch, an active patch and a director patch are arranged on the lower surface of the first dielectric substrate. The reconstruction method of the yagi antenna is as follows: a direct-current voltage is added across the two ends of the liquid crystal material, and the direct-current voltage is loaded on a medium below the active patch through the metal through hole via a T-shaped bias device. Inthis way, the effective dielectric constant of the liquid crystal material can be changed by changing the voltage of the direct current bias circuit, and then the working frequency of the yagi antenna is changed. According to the scheme, the antenna and the method are adopted, and the frequency reconstruction of the antenna is convenient. The reconstructed antenna is easy to integrate, and the processing difficulty of the antenna is reduced. Meanwhile, a main lobe beam can be concentrated between the side shooting direction and the end shooting direction, and the signal receiving effect is better.

Description

technical field [0001] The invention relates to the field of microwave technology, in particular to a frequency reconfigurable microstrip patch Yagi antenna and a reconfiguration method. Background technique [0002] Most of the existing reconfigurable antennas use PIN diodes and varactor diodes as control means, but the electrical control means for the electromagnetic waves inside the antenna are not limited to the two forms of PIN diodes and varactor diodes. For different types of electrical control methods, the maturity, applicability, performance and other features (compatibility, difficulty of integration and feeding network, and operating frequency, etc.) considerations. [0003] PIN diodes and varactor diodes are lumped electrical tuning components, which can be easily embedded in the antenna structure itself due to their integration characteristics. Since the research on the principles and characteristics of this type of components is relatively mature and "plug an...

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Problems solved by technology

However, MEMS also has its own disadvantages. For example, MEMS itself is a mechanical structure, so multiple switches will cause a certain degree of material fatigue, resulting in poor durability compared with integrated components such as PIN diodes.

At the same time, MEMS is also the same as the PIN diode, which can only provide two state conversions.

Although MEMS has a high degree of integration and excellent frequency response characteristics, its processing technology requirements are higher than those of lumped parameter components.

As a commonly used electromagnetic material, ferroelectrics have also been extended to electrically adjustable antennas, but compared with MEMS, their high loss is still a problem to be solved.

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