High-gain low-section annular antenna based on substrate integrated waveguide feed

Abstract

The invention discloses a high-gain low-section annular antenna based on substrate integrated waveguide feed, solving a problem that a section of an annular antenna is too high so that the annular antenna is not easy to be conformal with a carrier in a present airborne radar. The high-gain low-section annular antenna of the invention comprises a radiation unit (1), an upper medium plate (2), a lower medium plate (5), an upper metal layer (6) and a lower metal layer (7); the radiation unit is arranged on the upper surface of the upper medium plate; the upper metal layer and the lower metal layer are respectively arranged on the upper surface and the lower surface of the lower medium plate; the radiation unit adopts a symmetrical double-ring structure; a rectangle gap (4) is formed on the upper metal layer; a metalized through array (3) and a transition structure (8) are formed on the lower medium plate; the metalized through hole array go through the upper metal layer, the lower medium plate and the lower metal layer and constitutes a substrate integrated waveguide feed structure with the upper metal layer, the lower medium plate and the lower metal layer. The high-gain low-section annular antenna of the invention has advantages of the low section and high gain, can work at an X waveband and can be used for the radar system under an airborne platform.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a high-gain and low-profile loop antenna, which can be used in an airborne radar system. Background technique [0002] In an airborne radar system, in order not to affect the aerodynamic and stealth characteristics of the carrier platform itself, the antenna needs to be conformal to the carrier platform, which requires the antenna to have a low profile height. On the other hand, in order to increase the detection distance of the radar, the antenna unit used must have the characteristic of high gain. [0003] The substrate-integrated waveguide was formally proposed by Professor Wu Ke of the University of Montreal in 2001. The substrate-integrated waveguide can meet the needs of integration and miniaturization of microwave systems and microwave devices, and has similar transmission characteristics to traditional rectangular waveguides. The antenna fed by the substrate integrated...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned problem of high loop antenna profile caused by simply introducing a plane metal reflector, and propose a high-gain low-profile loop antenna based on substrate integrated waveguide feeding, so as to ensure that the radiation characteristics of the loop slot antenna are not affected. Under the premise of the influence, the antenna profile is reduced to achieve conformality with the carrier

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