Since each function would deserve an article of its own. We don't go into a detailed treatment of each function / property set here. However, we choose to use their more meaningful (property) names which (in most cases) are self-explanatory in the particular application context. As stated earlier, these all correspond with their different S-parameters. Here we list all relevant device properties. 2.2 Properties and the Application Context However, it is almost always optimized for one function over another. Note that real life devices can often be used for more then one function.
Shifts the phase between the two output ports by 90 or 180 degrees Splits power from an input port between to output ports or (vice versa) combines two signals. These will fix the function and its property's values.įinally, we will bring all elements together within the taxonomy. Next we take a look at the operating principle of the device and the technology used to implement it. Function and property values will define out desired device. All devices have similar properties but their (desired) values differ a lot according to the function of the desired qualities of the device. These are referred to as their properties. However, we will not only talk about S-parameters but also about their physical, meaningful names. What is the main function of the device? Next we take a closer look at the general properties of the devices described by its S-parameters. The first starts by looking at the use case. The proposed taxonomy is organized along several dimensions. These are the device model we will use in the taxonomy:įigure 1 RF power device models used in the taxonomy Passive means that there is no power generated inside the device, in a reciprocal device there is no difference in behaviour, dependent on the direction of propagation (S xy = S yx). The latter will look from the outside like a three-port device too.Īll of these devices are passive and reciprocal. However, some of them really are three-port devices while others are implemented as four-port devices with one port internally terminated at 50 Ohms. Because, in most cases, that is what they will physically look like. In this article, we choose to look at all devices as three-port models. To assist the RF engineer in choosing the right device for the job, we constructed a taxonomy of these devices.
However, when we classify these devices according to their functions and take the different kinds of operating principles into account, the pictures becomes clear. The landscape of power splitters, combiners, couplers and hybrides can be daunting at first glance.
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