A Generating Device of Small Reflection Broadband Standard Field

Abstract

The invention relates to the technical field of antenna and sensor electromagnetic field calibration, in particular to a small reflection broadband standard field generating device, which includes a loading single-cone TEM chamber and a hemispherical microwave anechoic chamber; the loading single-cone TEM chamber includes a cone, a mirror plate, Feeding structure and non-inductive resistor, the feeding structure is connected to the cone through the mirror panel; the non-inductive resistor is connected to the end of the cone and the end of the mirror panel through metal wires at equal intervals, and the distance between the non-inductive resistor and the feeding structure is the same as The busbars of the cones are of the same length and are at the same distance from the ends of the cones and mirror plates; the loading single-cone TEM chamber is fixed in the middle of the hemispherical microwave anechoic chamber through connecting pieces. The standard field generating device of the present invention can efficiently excite the signal generated by the pulse source into the single-cone TEM chamber, use the loading structure at the end of the single-cone TEM chamber to absorb the low-frequency signal at the end of the single-cone, and use the hemispherical microwave anechoic chamber to radiate the high-frequency signal from the cone The signal is absorbed, resulting in a standard field of small reflections, broadband, and known parameters.

Description

technical field [0001] The invention relates to the technical field of antenna and sensor electromagnetic field calibration, in particular to a small reflection broadband standard field generating device. Background technique [0002] Response performance and sensitivity calibration of antennas and sensors are very important tasks in the development and application process. At present, the calibration of antenna and sensor performance parameters at home and abroad is mainly based on the calibration method recommended by IEEE Std1309-2013. Specifically, the main methods include two category. One is to calibrate the sensor and probe in the time domain by using a standard field with known parameters generated by a TEM cell, tapered transmission line or GTEM chamber; the other is to use a waveguide, current loop or standard antenna to generate a standard field with known parameters to the sensor Perform frequency domain calibration with the probe. [0003] However, there are t...

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Problems solved by technology

[0005] Second, there are restrictions on the use of some existing standard field generating devices

Although the frequency range of the GTEM room can reach about GHz, the uniformity of the electric field in the inner space is not good, which limits its application in the calibration of high-precision electromagnetic field parameters

Standard antennas are usually used to generate higher frequency standard fields, but standard antennas have frequency dispersion problems and cannot be used for parameter calibration of time-domain antennas

The upper frequency limit of the loaded single-cone TEM chamber can reach 20GHz, but there is a time window problem due to the influence of end reflections, which limits its possible application in wider pulses and lower frequencies

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