Slot antenna with gate gap ground capacitor-loaded step impedance

Abstract

The invention discloses a slot antenna with gate gap ground capacitor-loaded step impedance, which relates to a slot antenna. The antenna comprises a dielectric substrate (1), a metal ground (2) and a radiation slot (3) on the dielectric substrate (1) and a microstrip feeder (4), wherein the radiation slot (3) and multiple parallel gate gaps (6) are arranged on the metal ground (2); two ends of the radiation slot (3) are short-circuited; a plurality of shunt capacitors (7) are arranged in the middle of the radiation slot (3) and are in bridge connection onto the edge of the radiation slot (3) to form a low-impedance slot (8); the rest part of the radiation slot (3) is a high-impedance slot (9); and one end of the microstrip feeder (4) is an antenna port (10) and the other end of the microstrip feeder (4) is open-circuited, passes across the high-impedance radiation slot (9) and extends for a certain length. The antenna works with multiple frequency bands, and the antenna size and the cross polarization can be reduced.

Description

Technical field [0001] The invention relates to a slot antenna, in particular to a slot antenna in which the capacitance of a grating slot is loaded with step impedance. Background technique [0002] The slot antenna is the dual antenna of the dipole antenna and has a wide range of applications. However, a common slot antenna not only has a half-wavelength of the radiation slot itself, but also requires a large metal ground area around the radiation slot. Usually, the length of the metal ground is half the length of the slot. One wavelength, the width of the metal ground is one-half wavelength larger than the width of the slot. Larger metal ground will make slot antennas unsuitable for multiple-input multiple-output (MIMO) applications, resulting in poor cross-polarization of the antenna, which will lead to a decrease in spectral efficiency and channel capacity. At the same time, the slot has a large impedance, which makes it difficult to match the impedance of the slot antenna...

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