Low-profile active microstrip antenna based on substrate integrated waveguide quarter-mode feed

Abstract

The invention discloses a low-profile active microstrip antenna based on substrate integrated waveguide quarter-mode feed. The antenna comprises a dielectric substrate, a radiation patch and a supportcolumn, wherein a metal floor is arranged on the lower surface of the dielectric substrate; four metal sheets are arranged on the upper surface of the dielectric substrate; a space for containing a source circuit module is formed in the inner sides of the four metal sheets; the outer side of each metal sheet is connected with the metal floor through a metallized via hole to form a quarter-mode substrate integrated waveguide cavity, which is connected with a feed network through a microstrip line; an active circuit module with a metal shielding cover is integrated in the middle of the dielectric substrate; and the radiation patch is supported above the dielectric substrate through the support column. The antenna disclosed by the invention not only solves the welding processing problem of coaxial probe feed and the floor incompleteness problem of coupling gap feed, but also effectively expands the bandwidth, and the antenna performance is improved; and the space utilization rate is improved on the basis that the antenna performance is not affected, and the overall profile of the active antenna is reduced.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a low-profile active microstrip antenna based on a substrate-integrated waveguide quarter-mode feeding. Background technique [0002] With the rapid development of wireless communication technology and requirements, antennas and radio frequency equipment, as key components that determine the performance of wireless systems, are facing more and more challenges: compact structure, small system weight, high signal quality, and diverse functions. The traditional scheme of separating the antenna and radio frequency equipment has been difficult to fully meet the requirements of the system, and the active integrated antenna has been widely used as a solution that complies with the development trend of wireless systems. [0003] Active antennas have been developed to this day, and we can already summarize some of their unique advantages compared with traditional passive antennas in micr...

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Problems solved by technology

At present, the feeding methods of microstrip antennas can be mainly divided into microstrip side feed, coaxial back feed, microstrip adjacent coupling feeding and slot coupling feeding, etc., but only slot coupling feeding can broaden the antenna bandwidth. potential

However, slot-coupling feeding needs to open a slot on the floor of the microstrip antenna, which is becoming more and more difficult to accept today as the system is becoming more and more integrated, because system integration will inevitably bring about electromagnetic compatibility problems between system modules. The incompleteness of the microstrip antenna floor is really a test for the electromagnetic compatibility of the system

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