1M35G1D Spacecraft SBand Radiation Pattern

0139-EX-CN-2018 Text Documents

Arizona State University

2018-10-05ELS_217632

Hardware Report: SANT Prepared for: SANT17 Document no.: HTR-20-00023-17 Revision: A Date: 6 April 2016 Name Date Signed Author Craig Olivier 6 April 2016 Approved Sampie Booysen

SANT Test Results HTR-20-00023-17 Rev. A 1 Scope This report covers the test results of the S-band patch antenna (SANT) with the serial number: SANT17. The antenna was subjected to comprehensive testing inside an anechoic chamber. The antenna was designed and optimized to be mounted on a 3U CubeSat structure, specifically, at the centre of one of the 300 x 100 mm panels. The measured results under heading 4 are based on this configuration. As requested by the customer, hereafter referred to as the user, CAD simulations were also performed to compare the users intended mounting of the antenna, with the ideal design for a 3U satellite. The results of these simulations are shown under heading 3. 2 SANT Specifications A summary of the most important specifications for SANT17 are given in Table 1. Specification Serial Number SANT17 Frequency Range 2.4 GHz – 2.45 GHz Polarisation Left Hand Circular Connector SMA Female Right Angle Weight 35 g Table 1: SANT17 Specifications 3 Simulated Results The results found in this section are the simulated results comparing the ideal 3U design with the users design. The particular parameters that were compared are Reflection Coefficient (S11), antenna polarization and the antenna gain. Figure 1 shows the CAD model used in the simulations for the users intended mounting of the antenna. Figure 1: Users Intended Mounting Configuration 1 Copyright © 2016 Cape Peninsula University of Technology www.cput.ac.za/fsati PROPRIETARY & CONFIDENTIAL INFORMATION

SANT Test Results HTR-20-00023-17 Rev. A Figure 2: Simulated Reflection Coefficient (S11) Figure 3: Simulated Gain 2 Copyright © 2016 Cape Peninsula University of Technology www.cput.ac.za/fsati PROPRIETARY & CONFIDENTIAL INFORMATION

SANT Test Results HTR-20-00023-17 Rev. A Figure 4: Simulated Axial Ratio 4 Measured Results As stated, the antenna was fully characterised inside an anechoic chamber. The antenna was measured according to the ideal 3U mounting configuration. The particular parameters measured were Reflection Coefficient (S11), antenna polarization, the antenna radiation patterns and the antenna gain. The antenna gain measurement was performed using the three antenna measurement method. A NSI-RF-GRP10 horn probe and a Marconi horn antenna were used in combination with the SANT to perform the gain measurement. A summary of the measured results are given in Table 2 and the figures below. Parameter Measured Values Frequency 2.4 GHz 2.425 GHz 2.45 GHz S11 -14.5 dB -13.5 dB -11.27 dB Axial Ratio -3.983 dB -1.925 dB -4.233 dB Gain 7.97 dB 7.94 dB 8.12 dB Table 2: Measured Results Summary 3 Copyright © 2016 Cape Peninsula University of Technology www.cput.ac.za/fsati PROPRIETARY & CONFIDENTIAL INFORMATION

SANT Test Results HTR-20-00023-17 Rev. A 0 -2 -4 -6 S11 [dB] -8 -10 -12 -14 -16 2,4 2,425 2,45 Freq [GHz] Figure 5: Measured Reflection Coefficient (S11) 10 9 8 7 6 Gain [dBi] 5 4 3 2 1 0 2,4 2,425 2,45 Freq [GHz] SANT17 Total Gain Figure 6: Measured Gain 4 Copyright © 2016 Cape Peninsula University of Technology www.cput.ac.za/fsati PROPRIETARY & CONFIDENTIAL INFORMATION

SANT Test Results HTR-20-00023-17 Rev. A Far-field amplitude of SNF_SANT17.nsi SANT17 0 deg, Horn 0 deg 2.30 GHz 2.33 GHz 2.35 GHz 2.38 GHz 2.40 GHz 2.43 GHz 2.45 GHz 2.48 GHz 2.50 GHz 2.53 GHz 2.55 GHz 0 -5 -10 -15 Amplitude (dB) -20 -25 -30 -35 -40 -45 -50 -150 -100 -50 0 50 100 150 Azimuth (deg) Figure 7: Far Field Pattern - SANT Horizontally Aligned, HORN Antenna Horizontally Aligned Far-field amplitude of SNF_SANT17.nsi SANT17 90 deg, Horn 90 deg 2.30 GHz 2.33 GHz 2.35 GHz 2.38 GHz 2.40 GHz 2.43 GHz 2.45 GHz 2.48 GHz 2.50 GHz 2.53 GHz 2.55 GHz 0 -5 -10 -15 Amplitude (dB) -20 -25 -30 -35 -40 -45 -50 -150 -100 -50 0 50 100 150 Elevation (deg) Figure 8: Far Field Pattern - SANT Vertically Aligned, HORN Antenna Vertically Aligned The beam width of SANT17 is approximately 60 degrees within its operating frequency range. 5 Copyright © 2016 Cape Peninsula University of Technology www.cput.ac.za/fsati PROPRIETARY & CONFIDENTIAL INFORMATION

SANT Test Results HTR-20-00023-17 Rev. A 0 -0,5 -1 -1,5 Axial Ratio [dB] -2 -2,5 -3 -3,5 -4 -4,5 -5 2,4 2,425 2,45 Freq [GHz] Figure 9: Measured Axial Ratio 6 Copyright © 2016 Cape Peninsula University of Technology www.cput.ac.za/fsati PROPRIETARY & CONFIDENTIAL INFORMATION


Document Created: 2016-04-11 16:57:24
Document Modified: 2016-04-11 16:57:24
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