Event Details
Substrate Integrated Waveguide Antenna Systems
Presenter: Sara Salem Hesari
Supervisor: Dr. Jens Bornemann
Date: Mon, September 18, 2017
Time: 14:00:00 - 15:30:00
Place: EOW 430
ABSTRACT
Due to high demand for planar structures with low loss, a considerable amount of research has been done to the design of substrate integrated waveguide (SIW) components in the mm-wave and microwave range. SIW has many advantages in comparison to conventional waveguides and microstrip lines, such as compact and planar structure, ease of fabrication, low radiation loss, high power handling ability and low cost which makes it a very promising technology for current and future systems operating in K-band and above. Therefore, all the work presented in this proposal focuses on SIW technology.
Circularly polarized (CP) antennas have become very popular because of their unique characteristics and their applications in satellites, radars, and wireless communications. Therefore, a novel K-band end-fire substrate integrated waveguide circularly polarized antenna system on a single layer printed-circuit board is proposed.
A high gain SIW H-plane horn and a Vivaldi antenna are developed to produce two orthogonal polarizations in the plane of the substrate. They are combined with a low profile SIW 3-dB coupler to provide identical feeding amplitudes with 90-degree phase difference.
Monopulse and tracking are essential features of communication and especially antenna systems. The integration of monopulse systems in planar, printed-circuit SIW technology combined with the added benefits of filtering functions is of great importance to the antennas and propagation community. In this proposal, a novel K-band monopulse tracking system on a single layer substrate integrated waveguide is presented.
The circuit comprises an antenna array of two Vivaldi antennas, a frequency selective power combiner, and two frequency-selective SIW crossovers, which eliminate the need for subsequent filtering. The proposed SIW monopulse tracking system not only uses fewer components in comparison with other systems, but also is compact, easy to fabricate, provides good performance over its operating bandwidth and, most importantly, possesses inherent frequency selectivity which makes filtering within the RF receiver chain obsolete.