Multi-Band Compact Microstrip Antenna

Modern synthetic-aperture radars (SAR) are used in many different fields such as infrastructure maintenance, geohazards control, forestry and waterbody management, maritime surveillance, and ice monitoring. SAR manages to locate objects both above and below the earth’s surface at the same time. To achieve those capability different combinations of equipment and antennas are utilized. Large percentage of current SAR systems are based on UAVs or small aircrafts which leads to constraints on the maximum size and weight of the system. Casual approach of setting all antennas on the same vehicle is unsuitable because antennas occupy too much space. Which comes from the fact that for the under-surface monitoring antennas usually work at low frequencies (P-band). In this paper new multi-layer antenna is proposed. This antenna consists of three layers of patch emitters for different frequency bands. Proposed antenna has low overall dimensions and low manufacturing complexity. Modeling results of each of three layers and combination of them are presented.