21. Compound reconfiguration is the capability of simultaneously tuning several antenna parameters, for instance frequency and radiation pattern . 22. The nulls between sidelobes occur when the radiation patterns passes through the origin in the complex plane. 23. X-ray focusing devices ( crystals / mirrors ) are not easy to build for such radiation patterns . 24. At these glancing angles, electromagnetic fields and radiation patterns are the same as for a half-wave dipole. 25. The main lobes of the radiation pattern are along the axis of the helix, off both ends. 26. This created a series of spikes, or lobes, within the cardioid radiation pattern , each about 7.5 degrees wide. 27. Umbrella antennas radiate omnidirectional radiation pattern . 28. These plots of the radiation pattern correspond to a distance between the antenna and its image of 2.5?. 29. Below is a comparison of the horizontal radiation patterns at L1 for both the blade and the slot. 30. So a monopole mounted over an ideal ground plane has a radiation pattern identical to a dipole antenna.
