Physical Research Laboratory
 

Block Diagram

Log Periodic Dipole Antenna(LPDA)

Specifications:

  • Frequency Range: 40-900 MHz
  • Gain: 8-9 dBi
  • Beam width: 90-110 degree
  • VSWR <2
  • Return Loss < -10 dBi

  • Design Parameter for Fabrication:
  • Number of Element = 28
  • Material for Boom and Elements = Aluminium
  • Length of Each Boom = 3.63 m (Parallel Two booms with spacing 1cm)

  • Cross section = 4 cm X 4 cm
  • Total Stub length = 0.937 m

e-CALLISTO Spectrograph

Specifications:

  • Frequency range: 45 MHz - 870 MHz
  • Frequency resolution: 62.5 KHz
  • Dynamic range: -120 dBm to -20 dBm
  • Sensitivity: 25 (mV/dB) ± 1mV/dB
  • Noise figure: < 10dB
  • Sampling frequency internal clock: 800 s/sec max, external clock: 1000 s/sec max
  • Number of channels: 1-500, nominal 200 frequencies per sweep
  • Supply: 12V ± 2V / 225mA
  • Weight: ∼ 800 g
  • Dimensions: 110mm x 80mm x 205mm
  • Input: 3 configuration files (configuration, frequency, scheduler)
  • Software Output: 2 files (FITS-file and logfile)

Voltage Standing Wave Ratio(VSWR)

The parameter VSWR is a measure that numerically describes how well the antenna is impedance matched. VSWR stands for Voltage Standing Wave Ratio and is also referred to as Standing Wave Ratio (SWR). VSWR is a function of the reflection coefficient, which describes the power reflected from the antenna. VSWR pattern of our LPD antenna is below 2 in entire frequency band (40 MHz - 900 MHz).

Radiation Pattern



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