By Richard von Mises, Kurt O. Friedrichs
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Disadvantages compared to the magnetron include size, weight, cost, and transmitter complexity. Ewell  provides an excellent treatment on the design of radar transmitters. The antenna is the device used to couple energy between free space and the transmission lines inside the radar. The transmitting antenna must take the RF energy from the transmitter and convert it into a beam of the desired shape illuminating the desired volume of space. The receiving antenna must receive electromagnetic energy from specific directions and guide that energy into the receiver.
We may re- duce the probability of successful detection, lock-on, or tracking by reducing the echo; there are several ways of doing so, some more effective than others. As we shall see, all carry a penalty. Shaping is intended to deflect target reflections away from the threat radar, but we must first know the direction to the radar. Absorbers bring about a different reduction in the echo signal by converting some of the incident radar energy into thermal energy, like a toaster, even if the temperature rise may be unmeasurable.
10) does not account for the polarization of the receiver. 11) where er is a unit vector aligned along the electric polarization of the receiver and Es is the vector scattered field. An equivalent expression accounting for the magnetic polarization of the receiver may be used when the incident and scattered magnetic fields are the basis of the development of the expression. As we will see in later chapters, the polarizations of both the receiver and the source of illumination may be arbitrary, but we can characterize all possible combinations with the measurement of just four specific quantities known as the polarization scattering matrix.