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Antenna Network for BLUEsat Microsatellite using 437MHz as a Transmit Frequency

Antenna Network for BLUEsat Microsatellite using 437MHz as a Transmit Frequency. Original Author: Jan A. King 23 August 2003 Updated by: Darran Siu 24 August 2003. Transmit Antenna System Block Diagram. Tx #2. Tx #1. 90 ° Hybrid. X. Note: Match all elements

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Antenna Network for BLUEsat Microsatellite using 437MHz as a Transmit Frequency

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  1. Antenna Network for BLUEsat Microsatellite using 437MHz as a Transmit Frequency Original Author: Jan A. King 23 August 2003 Updated by: Darran Siu 24 August 2003

  2. Transmit Antenna System Block Diagram Tx #2 Tx #1 90° Hybrid X Note: Match all elements To 50 ohms at green nodes ( ). /2 coax lines are 100 ohms. All Other lines are 50 ohms. X X = Arbitrary Length All 4 radiating elements Are /4 in length. /2 /2 Radiating Element, Typ. Of 4

  3. Darran’s Detailed Coaxial Diagram SMA 90° Hybrid Coupler 200 – 500 MHz Ant 1 Ant 3 TX - 1 0° /2 -> 243.80mm Transmitting at ~ 437MHz /2 -> 243.80mm 90° TX - 2 Ant 2 Ant 4 Male SMA Connector Female SMA Connector 50 Ohm Coax = Black – Length independent SMA F – F – F T Adapter SMA F to F inline straight through Adapter 100 Ohm Coax = Red - Length dependent

  4. BLUEsat Microsatellite Base Plate – Top View Ant 1 Coax entry hole 3mm Brass block securing antenna blade Delrin Antenna mount Block Ant 4 Teflon Coaxial cable (still shielded until entry into brass block) Ant 2 Antenna Blade 12mm steel Ant 3 Right Hand Circular Polarization???

  5. BLUEsat Microsatellite Base Plate – Side View SMA female T Adaptor SMA female inline straight thru Adaptor SMA Male connector Brass block securing antenna blade Delrin Antenna mount Block 50 Ohm Teflon Coaxial cable (still shielded until entry into brass block) Antenna Blade 12mm steel TX -1 100 Ohm Teflon Coaxial cable. Both lengths must be ½ wavelength of 437MHz TX -2 50 Ohm Teflon Coaxial cable – arbitrary length 90 ° Hybrid Coupler

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