How to choose high-speed and high-frequency rf test cables(1)

Before talking about how to choose high-speed and high-frequency rf test ables, let's talk about something that I have been doing recently. It is because of this thing that I still want to talk about this topic that many people have talked about.

Recently, I have been researching a relatively unfamiliar bus, which is a bus protocol jointly developed by Intel and Apple----Thunderbolt, the Chinese name is "Thunderbolt", and its third-generation products have also begun to appear. It has reached 40Gbps, so the design requirements of Thunderbolt are relatively high. Intel and Apple require that as long as the bus protocol and interface of Thunderbolt are used, they must be authorized. A very important content in the authorization test is the return loss test. , and requires the entire active link to perform return loss testing, which is very challenging for most people. When testing, you need to use rf test cables. From the test fixtures used, the rf test cables used by each company are different. Intel uses SMP connectors, and Wilder uses 2.92mm heads. Let's do The fixture uses a 3.5mm connector, which leads us to use different rf test cables to connect to the test equipment. With so many rf test cables, it will make us very confused to choose. I believe that many engineers have similar confusions, so today I will share with you an article related to selecting and testing rf test cables.
                                                    
Generally, everyone thinks that rf test cables are relatively simple, that is, a copper wire plus a braided net, and then a plastic package, and the two ends are added with connectors. of children's shoes. After reading the content below, you will know how many things need to be paid attention to in a rf test cable.

                                                    
In fact, for our general hardware developers, we pay more attention to the parameters related to the electrical performance of rf test cables, such as characteristic impedance, standing wave ratio (VSWR), impedance consistency, loss, transmission rate, cut-off frequency, shielding sex.

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1.  How to choose high-speed and high-frequency rf test cables（2）