Parameter Upconverter Downconverter Input frequency 950 MHz to 1450 MHz 14.0 to 14.5 GHz Output frequency 14.0 to 14.5 GHz 950 to 1450 MHz Gain flatness (full band) +/-1 dB +/-1 dB Gain flatness (40 MHz) +/-0.5 dB +/-0.5 dB Group delay variation
(40 MHz) 5 ns pp 5 ns pp Table 1.
The ETRF filter maintains exceptionally low group delay variation
over its full tuning range.
A geostationary satellite may move in a radial direction with a speed of several m/s, leading to unacceptable group delay variation
during the measurement time.
Typically exhibiting 1.3 ns group delay variation
and 1.7[degrees] p-p deviation from linear phase, this delay line filter will occupy a volume of only 7.5 [in.sup.3] with an insertion loss contribution of 0.5 dB, representing 50 percent improvement in occupied volume and 0.7 dB insertion loss improvement over a 0.141" diameter coaxial cable type.
In addition, group delay variation
is less than ns 8 (typ), making it ideal for digital applications.
It can be used to control a signal's amplitude without introducing intermodulation distortion, dispersion or group delay variation
The true in-band group delay variation
is approximately 1.5 ns (VNA technique), whereas the corresponding calculated value is 0.8 ns.
Group delay variation
will alter the phase relationship of the spectral components of the information.
The model CS-6200 system features include 1 GHz instantaneous bandwidth; group delay variation
of less than 10 ns; phase noise of less than -100 dBc/Hz at 10 kHz offset; spurious content of less than -50 dBc at rated output levels; and tuning resolution of 4 Hz step size.
The demonstrated group delay variation
is only [+ or -] 150 ns over the bandwith of interest, which is far superior to that of a multi-pole SAW resonator filter.
A ripple value of 0.05 dB was selected to provide minimum passband ripple, concurrent with minimum group delay variation
However, for three groups of C-sections, there is a zone where the group delay variations
are negligible even though the delay peaks are changing as marked in the figure.