Abstract
This paper presents and discusses three different low-cost microstrip implementations of Schottky-diode detectors in W Band, based on the use of the Zero Bias Diode (ZBD) from VDI (Virginia Diodes, Charlottesville, VA, USA). Designs are based on a previous work of modeling of the ZBD diode. Designs also feature low-cost, easy-to-use tooling substrates (RT Duroid 5880, 5 mils thickness) and even low-cost discrete SMD components such as SOTA resistances (State Of The Art TM miniaturized surface mount resistors), which are modeled to be used well above commercial frequency margins. Intensive use of 3D EM simulation tools such as HFSS TM is done to support microstrip board modeling. Measurements of the three designs fabricated are compared to simulations and discussed.
Highlights
Schottky diodes play an important role in several functions like rectification [1,2], mixing [3,4], and detection in all the range of microwave frequencies up to W band and beyond [4]
Based on our own experience, we have doubts about their robustness in relatively rough assembly processes, with limited guarantees of electrostatic protection. This motivated us to consider microstrip hybrid technology, its use in W band suffers from major limitations like inherent narrow band behavior of λ/4 lines and self-resonance problems of SMD (Surface Mount Devices) components [5]
We focus on low-cost solutions in the low end of THz presenting three different detectors in W-band, which have been designed and measured
Summary
Schottky diodes play an important role in several functions like rectification [1,2], mixing [3,4], and detection in all the range of microwave frequencies up to W band and beyond [4]. Based on our own experience, we have doubts about their robustness in relatively rough assembly processes, with limited guarantees of electrostatic protection This motivated us to consider microstrip hybrid technology, its use in W band suffers from major limitations like inherent narrow band behavior of λ/4 lines and self-resonance problems of SMD (Surface Mount Devices) components [5]. In [17], the theoretical foundations of Schottky diode detection are presented and the main devices are reviewed and compared, including 9161 and VDI ZBD diodes, discussing their different characteristics. The comparison between the three different versions is presented These proposed designs constitute a trade-off considering performance, robustness and general costs including, tooling, fabrication, availability of devices, etc.
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