Wideband vector network analyzer

Abstract

The invention discloses a wideband vector network analyzer. The wideband vector network analyzer is characterized by adopting a frequency slicing method and divides a test frequency range into three frequency bands, namely a low frequency band, a radio frequency band and a microwave band, and an excitation signal generation method, a test signal directional separation method and a frequency conversion receiving method of each frequency band are different. The wideband vector network analyzer is composed of a network analysis module, a 6GHz-20GHz front-end module and a 6G front-end module on the whole, wherein the network analysis module comprises an excitation signal source submodule, a fixed local oscillator module, a local oscillator signal source submodule and a medium frequency processing submodule, the 6GHz-20GHz front-end module and the 6G front-end module are connected, share a 6-20G front-end module test port, and are respectively connected to the network analysis module, and therefore the interaction among the 6GHz-20GHz front-end module, the 6G front-end module and submodules of the network analysis module is achieved. The wideband vector network analyzer adopt the measuring frequency slicing method, enables the processing of different frequency bands to be mutually independent, effectively avoids the difficulties in the design of low-frequency measurement and high-frequency measurement on the condition of small size, and achieves a wider frequency measurement range.

Description

technical field [0001] The invention relates to a broadband vector network analyzer. Background technique [0002] Vector network analyzer is the most commonly used test equipment in the field of microwave measurement, and is widely used in many test fields such as radar, electronic countermeasures, radio and microwave devices. The current broadband vector network analyzer is usually a large-sized desktop, which is not conducive to on-site testing. It is urgent to develop a small-sized, portable handheld broadband testing instrument. In a network test system, a directional coupler is usually used as a signal separation device, so the operating bandwidth of the directional coupler directly determines the test bandwidth of the instrument. Due to the limitation of the design size of the directional coupler and the influence of the transmission path on the radio frequency signal, Measurements from very low to very high frequencies are difficult to achieve on handheld instrument...

AI Technical Summary

Problems solved by technology

This implementation has a compact structure, but it is difficult to expand the working frequency band

If the 5KHz-20GHz vector network analyzer is implemented based on this scheme, firstly, it will greatly increase the difficulty of designing the directional coupler. Since the operating frequency ranges from radio frequency span to microwave, and the frequency band exceeds multiple octaves, in such a wide frequency range It will be extremely difficult to ensure performance indicators and keep a small volume; second, the transmission path will inevitably affect the high-frequency band signal. Due to the large span of the operating frequency range, if the entire frequency band is processed at the same time, the channel requirements are very high, and the design is more difficult. Big

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