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MidSTAR Analytical Determination of Far Field Radiation Using NEC Software

MidSTAR Analytical Determination of Far Field Radiation Using NEC Software. ENS Spencer Fishman, USNR U. S. Naval Academy Small Satellite Program 04FEB05 fishman@usna.edu. Y. Isometric View. Bottom View. X: MidSTAR principle axis Y: Launch vehicle vertical axis Z: Perpendicular to X,Y

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MidSTAR Analytical Determination of Far Field Radiation Using NEC Software

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  1. MidSTAR Analytical Determination of Far Field Radiation Using NEC Software ENS Spencer Fishman, USNR U. S. Naval Academy Small Satellite Program 04FEB05 fishman@usna.edu

  2. Y Isometric View Bottom View X: MidSTAR principle axis Y: Launch vehicle vertical axis Z: Perpendicular to X,Y Y’: Transmit antenna axis Main Rx Ant #2 Aux Tx Ant #2 Y Y’ 21.2” Aux Tx Ant #1 Main Rx Ant #1 Z Main Tx Ant #2 30” Coordinate System Aux Rx Ant #2 X Y’ Main Tx Ant #1 Main Rx Ant #2 Aux Rx Ant #1 Main Tx Ant #1 45° Z Lightband X Aux Tx Ant #2 X-Z plane MidSTAR Antenna Layout • Frequencies:Receive: 1.767 GHz, Transmit: 2.2022 GHz • Quarter-wave dipole omni-directional antennas • Antenna lengths: Rx: 4.24 cm, Tx: 3.41 cm • 4 Tx, 4 Rx antennas • Main and auxiliary communications systems each use 2 transmit and 2 receive antennas • Main and auxiliary antennas are not activated simultaneously

  3. 0 dBi Peak antenna gain is assumed to be 2.0 dBi (typical for monopoles) Y’ Radiated field is symmetric about Y’ axis

  4. 3-D Field Y’ • Approximating Peak EIRP • Total transmitter power is 1 W, split between two antennas (0.5 W each) • Assume peak antenna gain is 2.0 dBi (typical for monopoles) • Neglect losses • EIRPmax = -1.0 dBW • Actual Field Considerations • Line losses • VSWR ~ 1.5:1 • Antennas will not be perfectly resonant • Feed-point impedance • Ground plane will be affected by spacecraft edges and solar panels

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