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Radiofrequency and microwaves

Standard reference dipole

Modular standard reference dipoles available

SRD rendering

Standard reference dipoles (SRDs) have been adopted as an essential tool for evaluating sites used for electromagnetic compatibility (EMC) testing and calibration of associated antennas. The modular form of NPL’s SRD enables evaluation of sites with direct reference to traceable VNA (vector network analyser) measurement of the Balun and numerical model of the elements.

NPL is offering three options which are available to buy:

  1. Single SRD with 5 broadband elements
  2. Two SRDs with 5 broadband element pairs
  3. Two SRDs with 20 tuned element pairs

 

The SRDs are made on site at NPL, and are designed to be modular and user friendly. They are either tuned or broadband performance in the range 30 – 1000 MHz. The SRDs are ultimately traceable to NPL’s Reference Test Site:

  • Large ground plane 60 m by 30 m OATS (coupling of dipole antennas to the metal may be accurately predicted)
  • Direct reference to traceable VNA measurement of the Balun
  • Precision measurements ensuring traceability of results
  • Processing of Antenna Factor or Site Insertion Loss
  • Numerical model of the elements
  • The executable software CAP2010 models the coupling between two wire antennas and calculates the site insertion loss between a pair of dipole antennas and their antenna factors either over an ideal ground plane or in free space
Specifications  
Frequency Range 30 - 1000MHz
Return Loss >18dB
Power Handling 1 W
Uncertainty in site insertion loss (SIL) at
resonant frequencies
0.5 dB
Uncertainty of antenna factor (AF) at
resonant tuned frequencies
0.2 dB
Uncertainty of antenna factor over the
swept frequency bands
0.35 dB
Balun Length 0.8 m approx.

The above uncertainties apply to the deviation between the computed SIL (and AF) and the measured SIL over a continuously welded metal plate of minimum area 30 m x 20 m.

Dipole antenna

Software

The executable software CAP2010 models the coupling between two wire antennas, calculating the site insertion loss between a pair of dipole antennas and their antenna factors either over an ideal ground plane or in free space. Download the software and user manual for free.

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