Backward Diodes as Mixers at Microwave Frequencies

Oxley, T.H.

doi:10.1080/00207216408937681

Cited by 4 publications

(1 citation statement)

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“…2 Further, an account of the special technical requirements arising in connection with interferometry antennas for the stations is given and the choice of polarization determined by the problem of ground reflections is explained. 3 The necessity for the use of slots is mentioned, their operation is examined qualitatively and the effect of the dimensional parameters is considered experimentally. The design of the auxiliary antennas intended to remove the inherent ambiguity of this type of interferometry measurements is described.…”

Section: French Network Of Stations For Satellite Trackingmentioning

confidence: 99%

The performance of backward diodes as mixers and detectors at microwave frequencies

Oxley¹,

Hilsdent²

1966

Radio Electron. Eng. UK

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The physical properties of a backward diode, together with the parameters of a microwave mixer and low-level detector are briefly reviewed, indicating the choice of a bonded-contact structure and n-type germanium. The microwave performance of such a diode is discussed with particular emphasis on optimizing the diode for low-level detector and Doppler mixer applications.Results of r.f. performance at X-band frequencies are illustrated. These show that bonded backward diodes may be fabricated with improved detector and Doppler mixer characteristics compared with conventional point-contact microwave diodes. Further, the desirability to optimize their characteristics for a particular application is examined. Zero-bias tangential sensitivities of -62 dBm (1 Mc/s video bandwidth) have been achieved. The low-frequency noise properties of the backward diode indicate a potential receiver noise figure performance of about 16 dB at 3 kc/s intermediate frequency. The ability of the bonded backward diode to operate satisfactorily as a mixer (i.f. = 45 Mc/s) with very low local-oscillator power is shown.Finally, the performance of a bonded backward diode under development primarily as a detector is discussed. Measurements at zero bias indicate tangential sensitivities of -56 dBm (1 Mc/s video bandwidth) and video impedance about 800 Cl, whilst maintaining a mixer performance of about 8 dB. Further, this performance is shown to be substantially independent of temperature. The resistance of these devices to damage by electrical overloads is shown to be comparable with conventional point-contact microwave diodes.

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Section: French Network Of Stations For Satellite Trackingmentioning

confidence: 99%