LCR with S-diode switch.

 

The time variation of the radiated electric and magnetic field strength

 

 

The designed LCR has the following FEATURES:

 

The peak current driven through the LCR is 12 A.

The pulse repetition rate can be varied from 150 Hz to 1000 Hz.

The time variation of the radiated electric and magnetic field strength resembles one period of a sinusoidal oscillation with the following characteristics:

·      The rise time of the electric field strength from 0 to |Emax| is 0.5ns.

·      The duration of the first half period of the electric field strength measured at |0.5Emax| is 1 ns.

·      The total duration of first and second half period is 3.5ns.

·      The peak amplitude of the electric field strength is about 56V/m at a distance of 3m from the radiator.

·      The beam width of the peak amplitude pattern:

·      in the E-plane - 90o;

·      in the H- .

A power supply for nominally 5V, or 4.5 to 6V, and a current of 0.15A is required.

The size of the LCR is 0.4´0.3´0.15m3.

The weight is 1kg.

 

 

Radiation patterns

 

 

Angular dependence of radiated pulses shape

 

 

 

The use of a relaxation pulse generator with an S-diode provides good energy efficiency. This made it possible to use a battery as the power supply. The use of a battery and the ability to trigger the S-diode via infrared radiation removed many sources of distortion from the vicinity of the radiator. Using a battery also permitted a reduction of size and weight of the LCR. A three-layer metal-ferrite-ferrite shield suppresses radiation from the return loop significantly. Two TEM-horns for impedance matching reduces distortion and increases the amplitude of the current pulses driving the radiator. The shield and the TEM-horns make it possible to achieve dipole rather than quadrupole radiation. The independent power supply and the triggering of the radiation via infrared radiation make this LCR usable as element of an antenna array.

 

Detail description of antenna is published in

 

·         G.P.Pochanin "Large Current Radiator for the Short Electromagnetic Pulses Radiation" // Section "USP-2: ANTENNAS 2: SYSTEMS" for 11th International Conference on High Power Electromagnetics EUROEM'98, Tel-Aviv, 14-19 of July, 1998.

 

·        G.P.Pochanin P.V.Kholod and S.A.Masalov, "Large Current Radiator with S-diode Switch," IEEE Trans. Electromagn. Compat., (in press).