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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

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
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

darran s detailed coaxial diagram
Darran’s Detailed Coaxial Diagram

SMA 90° Hybrid Coupler 200 – 500 MHz

Ant 1

Ant 3

TX - 1

/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

bluesat microsatellite base plate top view
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???

slide5

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