Microwave limiter that suppresses leading edge spike of radiofrequency signal
阅读：981发布：2022-09-17
专利汇可以提供Microwave limiter that suppresses leading edge spike of radiofrequency signal专利检索，专利查询，专利分析的服务。并且An RF limiter includes a section of transmission line having ferrite material so arranged therewith and biased as to act as a reciprocal limiter. An RF signal passing in one direction through the transmission line is reflected so that the signal passes back through the transmission line in the opposite direction. The reflected signal is delayed at least a time period approximately equal to the fall time of a leading edge spike such that, when the delayed RF reflected signal reaches the transmission line section, the ferrite material in the transmission line section is in its nonlinear operating condition.，下面是Microwave limiter that suppresses leading edge spike of radiofrequency signal专利的具体信息内容。
1. A power limiter for radiofrequency signals comprising: a section of transmission line having a body of gyromagnetic material therealong characterized by the changing from a linear power limiter state to a nonlinear power limiter state where all signals above a given power level are absorbed in the body when properly biased by a DC magnetic field and upon the application of the radiofrequency signals above said given power level, and further characterized by the passing of an undesirable high level short duration leading edge spike when the radiofrequency signal has a rapid rise time and a magnitude above said given level, means for delaying the radiofrequency signals after being applied to said body of material for a time period at least equal to the time period it takes the peak of the leading edge spike to drop 10 db. such that when the radiofrequency signal finally passes out of the limiter the material in the limiter has changed from its lInear to its nonlinear state and suppression of the leading edge spike is accomplished.
2. The combination claimed in claim 1 above wherein said delay means delays the signals at least 12 nanoseconds.
3. The combination as claimed in claim 1 wherein said limiter is a reciprocal limiter.
4. A power limiter for radiofrequency signals comprising: a first section of transmission line, a body of gyromagnetic material positioned along said first section of transmission line, means for providing a DC magnetic field bias of a direction and strength to cause upon the application of said signals in either direction along said first section of transmission line power limiting of said radiofrequency signals above a given power level, said body of gyromagnetic material when so biased being characterized by, upon the application of said signal above a given power level, an undesirable, short duration, leading edge spike, and a second section of transmission line having one end coupled to said first section of transmission line and the opposite end terminated in a reflecting short, said second section of transmission line being arranged to provide a time period of delay along the length of said second section of transmission line of at least equal to half the time period it takes the peak of the leading edge spike to drop about 10 db.
5. The combination as claimed in claim 4 wherein said second section of transmission line is a waveguide.
6. The combination as claimed in claim 4 wherein the first section of transmission line is a waveguide.
7. A microwave power limiter for suppression of undesirable leading edge spikes associated with applied radiofrequency signals comprising: a cylindrical waveguide, a helical coil positioned in the waveguide, gyromagnetic material positioned in the waveguide with portions of the gyromagnetic material both inside and outside of the helical coil, means for providing a DC magnetic field so that upon the application of said radiofrequency signals above a given power level along the coil said body of gyromagnetic material favors excitation of certain spin waves which lead to absorption of the radiofrequency signal power, means for providing a reflecting short at one end of said coil, said gyromagnetic material, said coil length and pitch being arranged so that a time delay of at least 12 nanoseconds is provided between the application of said radiofrequency signals to said body and when said reflected signal passes out of said body in the opposite direction.
8. A microwave power limiter for suppression of undesirable leading edge spikes associated with applied radiofrequency signals comprising: a circulator of the type having a plurality of transmission lines joined at a common region with a body of gyromagnetic material located at said common region, said gyromagnetic material being of the type that when properly biased by a DC magnetic field provides coupling of said radiofrequency signals from one of said lines to the next adjacent line in a nonreciprocal manner, one of said transmission lines of said circulator having a reflected short at an end furthest removed from said common region, said one transmission line being dimensioned and arranged to provide a total delay from the gyromagnetic material to the short of at least about 6 nanoseconds, said body of said gyromagnetic material being arranged and having sufficient DC magnetic biasing such that upon the application of said radiofrequency signals above a given power level said body of gyromagnetic material favors excitation of certain spin waves which lead to power absorption of the radiofrequency signals.
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