Frequency bandwidth narrowing technology for cavity magnetrons installing cavity magnetrons into commercial marine radar

The unmodulated pulse magnetrons design and technology has advanced over the last seven years at New Japan Radio Co., Ltd. (New JRC). These developments have resulted in a dramatic reduction in the unwanted emission levels produced by magnetron devices. This was necessary to meet the increasing global demand for a more efficient use of the radio frequency spectrum, which is seen as a limited and scarce resource. These magnetrons utilise new techniques to reduce the unwanted emissions, while also improving the spectrum in the utilised frequency bandwidth. This paper explains in detail the processes and methodology used to reduce the unwanted emission levels for unmodulated pulse magnetron devices. In addition, this paper will describe Japan Radio's (JRC) commercial marine radar systems, operating in the S and X bands.