yig filter

yig filter

[′yig ‚fil·tər]
(electronics)
A filter consisting of an yttrium-iron-garnet crystal positioned in a magnetic field provided by a permanent magnet and a solenoid; tuning is achieved by varying the amount of direct current through the solenoid; the bias magnet serves to tune the filter to the center of the band, thus minimizing the solenoid power required to tune over wide bandwidths.
References in periodicals archive ?
The high-frequency path within the RF input-conditioning module includes a high-performance YIG filter preselector that defines the band of frequencies applied to the microwave band module.
Nonlinear operation permits narrowband filters with passbands of less than 1 MHz and [S.sub.21] characteristics equal to an eight- to 10-stage YIG filter. Figure 5 shows a block diagram of a non-linear filter representing an active filter (microwave amplifier and MSSW delay line) and MSSW signal-to-noise enhancer.
diameter YIG resonator and a small air coil are placed in the magnetic gap of the YIG filter. A microwave detector and associated analog circuits are added to the conventional YIG filter structure.
This multistage YIG filter effectively eliminates odd and even harmonics as well as spurious signals outside its 50 MHz passband, making the measurement more accurate than conventional schemes.
A simplified cross section of a typical YIG filter is shown in Figure 1.
After searching the entire frequency range, the counter returns to the largest signal, centers the YIG filter on that signal and begins the measurement process.
The high image rejection is due to a six-section YIG filter. Single sideband noise is typically lower than -105 dBc at 20 GHz carrier frequency and 100 Hz offset from the carrier.
A discussion on the development of epitaxial YIG filter bands based on tunable bandpass filters must include a comparison with the more mature YIG sphere technology.
The lower frequency, less than 26.5 GHz, direct RF input into a spectrum analyzer uses a preselector, usually a tracking YIG filter. The preselector is tuned by the frequency control section so that it tracks the desired signal frequency detected.
Unfortunately, YIG filters are limited to about 50-MHz bandwidth, which is far too narrow for the very wideband analysis required for today's signals.
Unfortunately, YIG filters do not tune fast enough to keep up with the switching speed of modern frequency agile emitters.
Previously, most of his time was spent designing YIG filters and oscillators.