Products
Compact transmitters using spatial-harmonic magnetron with cold secondary-emission cathode and solid-state modulator have been designed for airborne applications. The scheme of the modulator comprises such sub-assemblies as a high voltage converter, a filament power supply, protection circuits, a MOSFET switching stack, and a driver for powerful high voltage MOSFETs. The required high voltage is produced by using a single ended flyback converter along with a voltage multiplier, which is synchronized at a multiple pulse repetition frequency. The direct coupling to the magnetron has been used. Characteristics of 1 kW and 4 kW magnetron transmitters for the frequency of 95 GHz are given in Table, and their photos are given in Fig. 1 and Fig. 2. Such transmitters have been used, for example, in the side-looking radar.
| Peak output power, kW | 1 | 4 |
| Average power (max), W | 1 | 2 |
| Pulse duration, ns | 50-200 | 50-200 |
| Pulse repetition frequency (max), kHz | 10 | 5 |
| Volume, cm3 | 2000 | 3000 |
| Weight, kg | 2.5 | 4 |
| DC supply voltage, V | 28 | 28 |
| Watt consumption (max), W | 80 | 160 |
Fig. 1. Photograph of 1 kW, 95 GHz transmitter with solid-state modulator. 
Fig. 2. Photograph of 4 kW, 95 GHz transmitter with solid-state modulator.