In the development of a radar product and the general adjustment of the system, the unbalance of the sum and difference phases will be required. In order to make the phase of the sum and difference phases meet the design requirements, not only many factors affecting the phase unbalance and the methods of reducing the phase unbalance should be carefully considered in the design, but also in the general adjustment in the future. It is adjusted and revised to meet the requirements of the whole system. According to the condition of the general dispatch site, we need a fast, effective and feasible measurement method. Previously, we used the manual vector network analyzer in the early 1980s, which had low accuracy, intuitive display, and the measurement results could not be output.
We know that when we measure the reflection of a complex system, we get the comprehensive results of the influence of each part. It is not easy to determine the specific part (reflection characteristics), which brings inconvenience to the overall debugging. The time domain function of Anli's 37369C vector network analyzer can easily solve this problem. The time-domain measurement function of network analyzer is to obtain the time-domain response through the inverse Fourier transform of its internal processor after measurement in frequency domain. The time-domain response shows the relationship between the reflection coefficient and transmission coefficient of the network and time. It contains the magnitude, location information of each reflection point and the information of each transmission path.
There are two different working modes in time domain measurement: band-pass mode and low-pass mode. The band-pass mode is to give the impulse response of the device. It is suitable for any frequency range and is the most commonly used mode of operation. Low-pass mode is mainly used to measure low-pass devices. It can provide impulse response and step characteristics of devices. The amplitude of response and the type of reflection point (impedance characteristics R, L or C) can be determined by the displayed characteristic curve.
The function of "WINDOW" in time domain measurement can improve the dynamic range of time domain measurement and improve the amplitude resolution in time domain response. In addition, it also has a very useful "GATE" function, which is a time filter, shaped like a band-pass filter. It can eliminate the impact of the response other than "GATE" on the measurement results, and it is convenient to select the part we are interested in for measurement and analysis.
The time domain function of the network analyzer can be used not only to detect the reflection points of the cables and locate the faults, but also to observe the transmission of the tested equipment in the transmission measurement. When we test the characteristics of SAW filters, the measurement results include the effects of multi-channel transmission, adapters, connecting cables and filter fixtures. The real characteristics of SAW filters are unknown. After applying the GATE function of time domain measurement, we can remove the influence of adapters, connecting cables and fixtures, so as to obtain more accurate characteristics of the filter.
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