A Caltech Library Service

Millimeter-wave monolithic Schottky diode imaging arrays


Zah, Chung-en (1986) Millimeter-wave monolithic Schottky diode imaging arrays. Dissertation (Ph.D.), California Institute of Technology.


Inexpensive and compact imaging systems with high sensitivity are needed for millimeter waves. In this study, the calculated efficiencies of elementary integrated-circuit feed antennas show that the antennas with substrate lenses are potentially better feeds than those without substrate lenses. Planar Schottky diodes are integrated with bow-tie antennas to form a one dimensional array. The energy is focused onto the antenna through a silicon lens placed on the back of the gallium-arsenide substrate. Putting a polystyrene cap on the silicon lens has been demonstrated to be an effective way to reduce the reflection loss. A self-aligning process together with proton isolation has been developed to make the planar Schottky diodes with a 1.1-THz zero-bias cutoff frequency. The antenna coupling efficiency and imaging properties of the system are studied by video detection measurements at 94 GHz. As a heterodyne receiver, a double-sideband mixer conversion loss of 11.2 dB and noise temperature of 3770°K have been achieved at a local oscillator frequency of 91 GHz.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Electrical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Rutledge, David B.
Thesis Committee:
  • Rutledge, David B. (chair)
  • Yariv, Amnon
  • Nicolet, Marc-Aurele
  • Bridges, William B.
Defense Date:30 July 1985
Record Number:CaltechETD:etd-03112008-080410
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:927
Deposited By: Imported from ETD-db
Deposited On:14 Mar 2008
Last Modified:02 Jan 2013 19:56

Thesis Files

PDF (Zah_c_1986.pdf) - Final Version
See Usage Policy.


Repository Staff Only: item control page