CST – Computer Simulation Technology

Title:
Micromachined Millimeter-Wave Rectangular-Coaxial Branch-Line Coupler With Enhanced Bandwidth
Author(s):
Yi Wang, Maolong Ke, Michael J. Lancaster, Frederick Huang
Source:
IEEE Transactions on Microwave Theory and Techniques
Vol./Issue/Date:
Volume: 57, Issue: 7, July 2009
Year:
2010
Page(s):
1655 - 1660
Keywords:
Terms—Couplers, micromachining, millimeter-wave devices
Abstract:
Wideband millimeter-wave branch-line couplers have been demonstrated using micromachined air-filled rectangular-coaxial lines supported by quarter-wavelength stubs. The coaxial lines are constructed by bonding five layers of gold-plated silicon or SU8 slices. The measured coupler shows an insertion loss of 3.2–4.0 dB in the coupled and thru ports between the frequencies 31.3–47.6 GHz. The isolation is better than 12.8 dB, and the return loss less than 10 dB. In addition to providing support, the stubs enhance bandwidth when properly placed.
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