Directional Antenna Information

0027-EX-ML-2013 Text Documents

ARTEMIS, Inc.

2013-02-05ELS_133252

EXHIBIT #2 for Modification of License WF2XCV submitted by ARTEMIS, INC. File # 0027-EX-ML-2013 DIRECTIONAL ANTENNA INFORMATION Two antennas are included on this experimental license application in order to support a tiered testing approach for the AFRL Sea Dragon X-Band SAR system. This exhibit shows the parameters of each antenna and explains why both are needed. Antenna Properties The relevant properties of the two X-Band SlimSAR antennas are listed below. Low-Gain SlimSAR Antenna Parameters Physical Size: 10x1.5x3.5” 3-dB Beamwidth: 9ºx41º Peak Gain: 19.1 dBi High-Gain SlimSAR Antenna Parameters Physical Size: 50x5.5x4.5” 3-dB Beamwidth: 1.85ºx25º Peak Gain: 26.6 dBi Antenna Mounting The SlimSAR antenna is mounted on an aircraft in such a way that a line extending from the antenna boresight forms an angle of nominally 45º with a line that is normal to the ground. Initial testing of the X-Band SlimSAR for the Sea Dragon program will be done at low power and low altitude. The Low-Gain antenna described above will be flown at altitudes up to 4000 ft AGL with a 25 W power amplifier. This mode will be used as much as possible to prove the system. Final testing will be done with the high-gain antenna at an altitude of 10000 ft AGL and a 150 W power amplifier. The combination of higher altitude and side-looking geometry means that actual radiated power density will be very low on the ground. The radar system radiates for only a few minutes at a time during testing, and all testing is done with the goal of non- interference in mind. Illustration 1: Angle of antenna boresight relative to ground normal.


Document Created: 2019-03-15 05:46:50
Document Modified: 2019-03-15 05:46:50
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