Dual-frequency phased array antenna loaded with ferroelectric-film phase shifter

Abstract

The invention discloses a dual-frequency phased array antenna loaded with a ferroelectric-film phase shifter. The dual-frequency phased array antenna is composed of a dielectric substrate, ground plates, a radiation patch, a microstrip feed network and a BST film phase shifter. The radiation patch is set to have a fan-shaped structure. The BST film phase shifter consists of a signal line, a BST ferroelectric film, and interdigital capacitors; and the interdigital capacitors arranged at the two sides of the signal line symmetrically to form a coplanar waveguide (CPW) structure. The ground plates are arranged at the outer side of the outer sides of the interdigital capacitors symmetrically. And the thickness of the dielectric substrate is 280 to 320 mm. According to the invention, the coplanar interdigital capacitor waveguide type BST ferroelectric-film phase shifter is used as a phase shift unit working at 15-GHz and 18-GHz dual-frequency-band antenna array. On the basis of changing ofthe original rectangular microstrip patch antenna array, a 1*4 fan-shaped microstrip patch antenna array is used creatively. Overall modeling simulation is carried out by using electromagnetic simulation software HFSS. With simulation and giving of different biased electric fields, the radiation steering angle of the antenna array is debugged to realize turning with the angle of +22 degrees or -22degrees of the antenna array.

Description

technical field [0001] The invention belongs to the field of microwave antennas, in particular to a dual-frequency phased antenna array loaded with a ferroelectric film phase shifter. Background technique [0002] Since its appearance, phased array antenna has been widely used in military and civilian communication systems because of its superior electronic scanning characteristics. Dual-band operation is one of the important issues in the design of microstrip antennas. Related designs include the use of multi-layer metal sheets, rectangular metal sheets with slot loads, and square metal sheets with rectangular notches. Most existing designs use corner cutting, surface slotting, orthogonal double-feed, etc. to achieve dual-frequency operation. The microstrip sector antenna can be realized by cutting and chamfering the rectangular patch, which can provide a dual-frequency resonance point and greatly reduce the cross-sectional size of the antenna, which facilitates the miniat...

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Problems solved by technology

[0004] At this stage, researchers at home and abroad have applied miniaturized phase shifters such as ferroelectric thick film phase shifters and waveguide phase shifters to phased array antennas, but the phased array antennas based on ferroelectric thin film phase shifters There are few studies, and the steering angle of the antenna is limited, mostly within ±10°

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