A photo of double slot antennas integrated with bolometers on a thick membrane. The photo is made from the back of the substrate. A few antenna designs were made on the same chip for further antenna investigations.
The gain bandwidth measurement setup.
The mixer signal vs IF for HEB mixers on membranes (S001-16,17). The bias points are shown in Table II (and Fig. 3). The roll-off frequency is indicated for all curves. The fitting lines are obtained from (1).
curves (without LO and with LO) of a mixer on a membrane (S001-16). The bias points, where the GBW was measured, are indicated.
The mixer signal vs IF for a HEB mixer on a membrane. The bias points are shown in Table II. The roll-off frequencies are indicated for all curves. The fitting lines are obtained from (1).
An illustration of the electron energy relaxation process in NbN HEB mixers.
Parameters of HEB mixers. For all devices, the bolometer width was , the length , and the film thickness .
Summary of the measurement results for all samples.
NbN film-substrate transmission coefficient for different substrates, obtained from the electron relaxation time and from the acoustic mismatch theory (Refs. 36 and 37).
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