Creating a region with a strong electric field or charge in free air using radar interference patterns, particularly in the microwave bands, is not a straightforward task. Interference patterns generated by radar systems typically involve the superposition of multiple electromagnetic waves, which can result in areas of constructive or destructive interference. However, it is challenging to generate a localized and sustained strong electric field or charge in free air using this approach.
Radar systems are primarily designed for the purpose of detecting and tracking objects or measuring distances based on the reflection or scattering of electromagnetic waves. While interference patterns can be created, they typically do not result in the generation of a significant and sustained electric field or charge in the surrounding air.
If you specifically aim to create a strong electric field or charge in a localized region, other methods such as electrostatic generators or high-voltage systems would be more suitable. These systems typically involve the use of high voltages and specialized configurations to generate strong electric fields or charges in a controlled manner.
However, it is crucial to note that working with high voltages and strong electric fields can be extremely hazardous and should only be done by trained professionals in controlled environments following proper safety protocols.