UWB antennas development

The Electrical Engineering and Telecommunication Departments of the RMA has developed small-sized ultra-wide band TEM horn silicon-filled antennas with a frequency range from 1 GHz to 7 GHz ([4], [5] and [6]). The maximum size of these antennas does not exceed 12 cm. Thanks to the use of a pulse generator with a rise time of 45 psec, of a computer controlled digitizing oscilloscope and of a computer controlled X-Y gantry on which the emitting and the receiving antennas are fastened, it is possible to record the A-scans, B-scans and C-scans which are needed for our project and for optimizing the antennas. Fig.(5) shows two of the antennas which were used for the tests and a sample A-scan of a PMN mine in loam. Fig.(6) presents two B-scans of a PMN mine respectively in loam and in sand and a C-scan of a PMN mine in loam at 4cm depth.

  

Figure 5: Antennas and an example of a PMN A-scan in loam

  

Figure 6: from left to right, PMN B-scans in sand and in loam and a PMN C-scan in loam