REFLECTOR ANTENNAS LOW SIDELOBE DUAL POLARIZED REFLECTOR ANTENNA The DPRA-2737/A parabolic antenna is designed with a dual polarized feed optimized in size and phase center in order to get very low sidelobes. This antenna is ideal for RCS measurements. The same type of antenna can be available at other frequencies on request. FREQUENCY BAND: SIDELOBES: GAIN: -3 dB BEAMWIDTH: CROSS-POLARIZATION: VSWR: 2.7 - 3.7 GHz < -25 dB > 26 dB 7.5 -6 degrees < -25 dB < 2:1 5 0 -5 MA GN -10 IT U DE (dB ) -15 -20 DPRA-2737/A -25 -30 -35 -45 -30 -15 0 15 30 45 AZIMUTH (Degrees H-PLANE RADIATION PATTERN 3.2 GHZ 35 GHZ PARABOLIC DISH ANTENNA The PRA-3435/A4 is a high gain parabolic dish antenna with a single symmetric feed. An orthomode transducer (omt) is included to give simultaneous vertical and horizontal linear polarization. The antenna exhibits excellent cross polarization as well as good sidelobe performance. Frequency Range Antenna Gain Antenna 3 dB Beamwidth Peak Power Average Power VSWR Polarization Cross Polarization Isolation Antenna Feed Input Flanges Beam Coincidence Sidelobes Size 34.5 - 35.5 GHz 50 dBi min. (@ 35 GHz) 0.5 100 kW 100 W 2.0:1 max. Dual Linear (vertical & horizontal) 30 dB min. in the 3 dB contour Cover flanges of type UG-599/U Vertical & horizontal RF beam axis is within 0.1 of each other <20 dB below the peak of the boresight main beam 4-foot reflector PRA-3435/A4 Feed ................................................................................................................................................................................................................................................................ Phone: 301-937-8888 z Fax: 301-937-2796 z http://www.ara-inc.com z sales@ara-inc.com 49 REFLECTOR ANTENNAS SPECIFICATIONS: * TYPE: PARABOLIC REFLECTOR ANTENNAS S: Standard Parabolic Reflector D: Deep Dish H: High Performance Antenna with Radome ARA MODEL PRA-1719/A2 PRA-1719/A4 PRH-1719/A2 PRH-1719/A4 PRA-1826/A2 PRA-2123/A2 PRA-2123/A4 PRH-2123/A2 PRH-2123/A4 FREQUENCY RANGE (GHZ) 17.7 - 19.7 17.7 - 19.7 17.7 - 19.7 17.7 - 19.7 18.0 - 26.5 21.2 - 23.6 21.2 - 23.6 21.2 - 23.6 21.2 - 23.6 REFLECTOR DIAMETER FT (M) 2(0.6) 4(1.2) 2(0.6) 4(1.2) 2(0.6) 2(0.6) 4(1.2) 2(0.6) 4(1.2) GAIN DB LINEAR LOW 38.4 44.3 38.4 44.3 38.1 40.0 45.8 40.0 45.8 MID 38.9 44.8 38.9 44.8 40.1 40.4 46.2 40.4 46.2 HIGH 39.3 45.2 39.3 45.2 41.2 40.8 46.6 40.8 46.6 HALF POWER BEAMWIDTH T YPE* (DEGREES) 2.1 - 1.8 S 1.0 - .92 S 2.1 - 1.8 H 1.0 - .92 H 2.0 - 1.4 S 1.7 - 1.5 S .86 - .77 S 1.7 - 1.5 H .86 - .77 H VSWR FRONT TO BACK 1.15 1.15 1.15 1.15 1.5 1.15 1.15 1.15 1.15 RATIO (DB) 45 55 62 66 45 45 55 65 67 PRH-1719/A2 - CROSS POLARIZATION AND SIDELOBE CURVE 0 Relative Gain (dB) 0 -10 -10 -20 -20 -30 -30 -40 -40 -50 -50 -60 -60 -70 -70 -180 -140 -100 -60 -20 -15 -10 -5 0 5 10 15 20 60 100 140 180 Azimuth Degrees from Main Lobe PRH-1719/A2 ENVIRONMENTAL RATINGS TABLE VERTICAL TOWER MOUNT ANTENNAS: REFLECTOR DIAMETERS 2' and 4' 6' and 8' SURVIVAL RATINGS OPERATE WIND WIND ICE MPH MAX. DEFLECTION MPH (KM/HR) IN (MM ) (KM /HR) DEGREES 125 (201) 125 (201) 1 (25) 1 (25) 100(161) 70(112) 0.1 0.1 In the above table, "Survival Ratings" and "Operate Wind" comply with the definitions of Standards EIA195-C and EIA-222-D. Beam deflections at "Operate Wind" and material stresses at "Survival Wind" do not exceed allowed limits. Phone: 301-937-8888 z Fax: 301-937-2796 z http://www.ara-inc.com z sales@ara-inc.com 49