Q-band VCO
Proposed External Medium Q Resonator
This resonator can be used for 77GHz FMCW-based radar applications.
CHV2242c
The chip has been especially designed to be coupled to a medium Q resonator
printed on temperature compensated soft substrate. The resonance is given by
three half wave coupled lines. The length of the coupler (L) gives the centre
frequency and the space between the coupled lines (s) gives the bandwidth. For
easy connection and phase considerations half wave lines are at the input and
output of the filter. All the recommended dimensions are given in the following
drawing.
The main substrate characteristics are the following (ROGERS R03003)
Dielectric
constant
3
Thickness
250µm
Dissipation
factor (10GHz)
0.0013
Thermal
coefficient
13 ppm/°
C
The typical resonator length (L) is 7.35mm for a coupling value (s) of 0.4mm and
for a frequency of 38.25GHz. However this L value should have to be adjusted
depending on the final chip environment.
Other possibility is ARLON/CLTE substrate. (L is 7.27mm for s=0.4mm)
Ref. : DSCHV2242c6354 - 20 Dec 06
5/9
Specifications subject to change without notice
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