Semiconductor and ferroelectric antennas

The results of investigation some ferroelectric and semiconductor antennas have been presented in this paper. Discussed solutions have been based on the utilize ferroelectric and semiconductor materials. It permits to design the electronically controlled beam-steering and electronically reconfigurabled antennas. The ferroelectric microstrip antennas possess many advantages, can be very usefull in practical applications. The possibility of the reconfiguration of the antenna aperture is also very promising. The key element of the reconfigurable antenna is a surface PIN (SPIN) diode whose conductivity changes proportionally to the plasma density. SPIN structures can be activated selectively and causes in turn a generation of the desire shapes of radiation pattern.