Antenna impedance testing system and method

Abstract

The invention discloses a system for testing antenna impedance. The system for testing the antenna impedance comprises a tested antenna, a high-voltage power source, an adjustable inductor L, an inductance and resistance testing module, a data processing module, a controller, a stepping driver, a gathering module, a potential-divider network, a light-operated switch module and a protection resistor. According to a working mechanism, oscillating starting initial high voltage is injected into a self-damping oscillation circuit with the frequency selectable so that self-damping oscillation can be generated; self-damping oscillation physical characteristics are commonly determined by parameters of elements so that the resistance value of the antenna to be tested can be obtained through sampling and calculation conducted on the oscillation voltage. According to the system for testing the antenna impedance, the testing signal-to-noise ratio can be effectively improved and under the actual emitting operating frequency of the antenna, accurate measurement of the antenna impedance is conducted.

Description

technical field [0001] The national defense invention patent belongs to the technical field of radio communication antenna testing, and specifically relates to a low frequency antenna (very low frequency, ultra low frequency, extremely low frequency) impedance test method and test system. Background technique [0002] The size of the communication antenna is determined by the communication wavelength. Due to the large size of the low-frequency communication (very low frequency, ultra-low frequency, and extremely low frequency) antenna, the electrostatic induction is strong. Its surface electrostatic induction can reach 2000v, which makes it impossible for common antenna testing equipment to perform antenna impedance testing. The low-frequency communication design, construction, commissioning, maintenance, and on-site online transmission all require on-site accurate measurement of antenna impedance. [0003] In the prior art, there are mainly the following three methods for ...

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Problems solved by technology

Its disadvantages are: first, limited by the output voltage of the excitation source, the electrostatic voltage is much greater than the excitation voltage, resulting in a large measurement error; second, the coupling resonance frequency is fixed, which cannot meet the test requirements under the condition of the transmission frequency

[0011] In short, the disadvantages of the above methods are as follows: first, the signal-to-noise ratio of the measurement is low, the maximum is about one-tenth; second, the frequency requirements of the nonlinear device impedance measurement do not meet the actual transmission frequency

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