Digital antenna architectures using commercial off-the-shelf hardware
Eng, Cher Shin
Jenn, David C.
MetadataShow full item record
The changes in war fighting tactics and advancement of technology shape the ways to implement and design multifunction phased array radars. This thesis investigated whether the commercial modulation boards used in the 3-D 2.4- GHz phased array transmit antenna is capable of wideband performance. The phase of the transmitted signal out of the modulator board was adjusted to provide a phase shift from 0 to 2 ,Ì§ and the insertion phases at these phase settings were measured using a Vector Network Analyzer, sweeping the frequency from 0.8 to 2.5 GHz. The measured insertion phases are used to simulate the radiation pattern of a linear phased array, and the results show that modulator does not have instantaneous wideband characteristics. This thesis also looked at the design of the complementary phased array receiver architecture using commercially available demodulator boards. The demodulator board was successfully configured to operate as a phase shifter. Phase shifted transmit signals were injected into the demodulator, and corresponding phase shifts were measured via the In-Phase and Quadrature voltages.
RightsCopyright is reserved by the copyright owner.
Showing items related by title, author, creator and subject.
Eng, Chun Heong (Monterey, California: Naval Postgraduate School, 2009-12);This thesis describes the design and development of an automated demodulator calibration station. Many commercial demodulator boards have an inherent problem of DC offset due to their direct down conversion architecture. ...
Brenner, David William (Monterey, California. Naval Postgraduate School, 1994-09);This thesis investigates the design of a digital fiber-optic interferometric demodulator based upon a passive symmetric combination of signals produced by an interferometer terminated with a 3x3 optical coupler. The ...
Design and operation of a simple circuit useful as a modulator to generate arbitrary composite ASK and PSK carriers. Maughan, Allan M. (Monterey, California. Naval Postgraduate School, 1982-06);In radio transmission of binary data, it is often desirable to conserve bandwidth at the expense of signal power. To reduce carrier bandwidth (switching rate), H bits are used to change a parameter of the carrier, so ...