There is a need of Phased Array Antennas in applications such as wireless communication, RADAR systems. The radiation pattern for this type of antenna has to be narrower sharper in one direction and should have nulls in other directions. In order to achieve this, phased array antennas are designed in such a way so as to steer the beam in required direction automatically. One of the techniques d...

A variable phase shifter using a movable waffle iron metal plate comprised of iron rods a quarter-wavelength in length is proposed. A study of the waffle iron structure was carried out and the design method for creating a structure that would achieve large phase changes, small loss, and good isolation between adjacent phase shifters is discussed. Experiments on 1-port and 2-port phase shifters ...

RF Micro-Electro-Mechanical (MEM) switches have numerous potential applications from mode switching in cell phones at 1-2 GHz to phased array antennas for space-based radar applications. However, environmental factors such as temperature, humidity, and foreign contaminants play a significant role in switch reliability and lifetime. The effects of these environmental factors must be mitigated to...

Based on polymeric materials, the possibilities of monolithic integration of various optical waveguide components are discussed and, especially, the efforts to realize the functions of optical modulation and amplification on a single optical chip are made. Exploration of more capabilities of optical waveguides is also emphasized. The work on exploring functions of optical waveguides for the app...

This report describes the completion of the studies, initiated in FY 69, carried out to assess the practicability of applying microwave integrated circuits and solid state fundamental oscillators to future sensor subsystems for radar and communications, including data relay. The X-band eight-element phased array was evaluated, a simple MIC module including a printed antenna was constructed and ...

The embedded ultrasonic structural radar (EUSR) was developed based on phased array technology. It can interrogate large structural areas from a single location using ultrasonic guided Lamb and Rayleigh waves generated by tuned piezoelectric wafer active sensors (PWAS) that are permanently attached to the structure. This paper brings together several aspects of the implementation and applicatio...