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Dipole mode measurement

Unloaded

  • Port4 - antenna
  • Port3 - coupler 2
  • All other ports covered with foil
  • $Q$ = 310
  • $f_0$ = 14995
  • BW = 48 MHz

DipAnt2Out01.png

Loaded

  • Same but all other ports terminated
  • $Q$ = 250
  • $f_0$ = 14990 MHz
  • BW = 61 MHz

DipAnt2Out02.png

Reflection coefficient for each port

Reflection.png

Transmission coefficient

Transmission.png

Cross-coupling

XCoupling.png

Monopole mode measurements

  • Port4 - antenna
  • Port2 - coupler 3
  • Port3 - coupler 1
  • Couplers 2 and 4 covered with foil
  • $Q_{24}$ = 260
  • $Q_{34}$ = 310
  • $f_{24}$ = 11157 MHz
  • $f_{34}$ = 11160 MHz

MonoAnt2Out01.png

  • Same with couplers terminated

MonoAnt2Out02.png

  • Port4 - antenna
  • Port2 - coupler 4
  • Port3 - coupler 2
  • Couplers 1 and 3 terminated
  • $Q_{24}$ = 310
  • $Q_{34}$ = 290
  • $f_{24}$ = 11158 MHz
  • $f_{34}$ = 11172 MHz

MonoAnt2Out03.png

  • Same with couplers covered with foil

MonoAnt2Out04.png

Reference Resonant Frequency

REFAnrenna.png

Photographs

Parts.JPG

AssembledInJig.JPG

Temperature Stability

The position cavity was left over the weekend along with a probe measuring the ambient temperature. The temperature was recorded every minute and the resonant frequencies, every ten minutes.

tempstabwk1.png tempstabwk2.png

The average frequency shift was 250±6 kHz/C

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Topic revision: r6 - 02 Apr 2013 - StewartBoogert

 
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