Measurement and analysis change-over device for vehicle-mounted antenna

Abstract

The invention proposes a measurement and analysis change-over device for a vehicle-mounted antenna, and the device comprises frequency dividers which are connected to two vector signal generators and receive the excitation signals emitted by the signal generators; a frequency mixer which is connected to the two frequency dividers, receives the signals emitted by the frequency dividers and carries out the frequency mixing, wherein the other end of the frequency mixer is connected to detected equipment; and impedance converters which are respectively disposed between the frequency dividers and the frequency mixer, and between the frequency mixer and the detected equipment. According to the invention, the device provided by the invention cooperates with a spectrum analyzer and a network analyzer, can achieve the measurement of related parameters more practically in less time, achieves the more convenient measurement of parameters of an antenna in a far-field laboratory, carries out the analysis and estimation of the key parameters in the measurement, and guarantees the testing accuracy and consistency.

Description

technical field [0001] The invention relates to the field of vehicle radio antenna testing, and in particular to a vehicle antenna measurement and analysis switching device. Background technique [0002] Car radios are divided into rod antennas and glass antennas. Due to the limitation of appearance and use conditions, the length of rod antennas is often smaller than the wavelength length, and the structure of the vehicle will restrict the antenna to be installed on the top or rear of the car, so the receiving performance of the antenna will be affected. It is reduced a lot. In order to ensure the receiving effect, there is usually a Low Noise Amplifier (LNA) to match the antenna, and the signal is sent to the radio receiver through the LNA through the feeder. The composition of the low noise amplifier mainly includes input, output matching network and DC bias network. [0003] In order to ensure that the car AM / FM radio antenna can work reliably in various environments, th...

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Problems solved by technology

Antenna designers often go to the site to spend a lot of time on signal matching and analyzing the antenna effect under different signal conditions. During the radio antenna test process, it is easy to encounter the problems of interface mismatch and received signal field strength mismatch.

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