Conductive material broadband passive intermodulation characterization method based on elliptical monopole patch antenna

Abstract

The invention relates to a conductive material broadband passive intermodulation characterization method based on an elliptical monopole patch antenna, which comprises the following steps: 1) conducting calibration, specifically connecting a calibration copper foil patch to an antenna feeder through soldering tin, testing antenna electrical parameters and reflection PIM, and ensuring a loop connection state and a low intermodulation characteristic; 2) replacing a material to be tested, specifically cleaning a connecting material between the antenna feeder and the copper foil patch, taking down the calibration copper foil, and assembling the material to be tested after cleaning; 3) representing the intermodulation characteristic of the MUT; 4) testing all the to-be-tested materials; 5) conducting inspection, specifically observing whether more than two types of reflection PIM of the MUT fall below the sensitivity of a receiving system, if so, increasing the input power by a step length of 1dB until the PIM amplitude of the MUT falls in the test threshold of the PIM test system; and 6) conducting normalization, specifically according to the test result in the step 3), normalizing the test results of all MUTs according to a formula of PIM test result + (43-test input power) * 2.5, and approximately obtaining PIM test results of all DUTs under 43dBm dual-carrier excitation.

Description

technical field [0001] The invention belongs to the technical field of radio frequency passive intermodulation testing, and in particular relates to a broadband passive intermodulation characterization method of conductive materials based on an elliptical monopole patch antenna. Background technique [0002] Due to the potential risk of material nonlinearity and contact nonlinearity in RF devices, multiple carrier signals passing through the device will excite some interference signals in the loop, and the third-order intermodulation signal will seriously deteriorate the signal-to-noise ratio of the system. Most of the PIM test platforms caused by contact nonlinearity are based on the conductive PIM test method, and the corresponding contact state is measured by comparing the PIM level under different contact interfaces and contact pressures. During the measurement, the contact pressure is achieved with a torque wrench or a mechanical arm loaded with a force sensor. Compare...

AI Technical Summary

Problems solved by technology

For example, for the RF front-end, when comparing the PIM levels of conductive fabrics with different components, the whole machine can only be tested and compared after being assembled.

At the same time, there is also a lack of direct and effective comparison methods for the intermodulation performance between conductive materials such as conductive cloth, foam, and silver paste.

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