Transition Design for Microstrip Line to Waveguide on Q-Band and V-Band
Date Issued
2005
Date
2005
Author(s)
Yang, Tsung-Hsun
DOI
zh-TW
Abstract
In this thesis, two transitions from microstrip line to waveguide on Q-band and V-band are presented respectively.
One traditional transition between microstrip line and rectangular waveguide is based on the concept of the tapered slot probe antenna and a tri-section transformation on Q-band. With broadband performance and
compact size, the antenna is inserted into the E-plane of the end launcher of the waveguide. As the result, one single transition exhibits over 50% bandwidth on Q-band (40-50GHz) for -15dB return loss and approximately 0dB insertion loss in 44-50GHz. Also a back-to-back transition is fabricated to verify the accuracy of the simulation. Good agreement is observed from the comparison between the simulation and measurement results.
The other transition is an open-circuited type V-band transition between microstrip line and substrate integrated waveguide (SIW) fabricated on a low temperature co-fire ceramic (LTCC) substrate. The energy is coupled to the waveguide through a via probe from the feeding
microstrip line. The stripline pad to the via probe is introduced to improve the transition performance. The structure height of 176-μm which equals 0.073 guided wavelength is very short in the microwave system. One single LTCC transition exhibits 10% bandwidth (58-64GHz
in center frequency 60.5GHz) for -15dB return loss and 2dB insertion loss in center frequency. It is found that the relatively high insertion loss of 2dB is mainly attributed to the dielectric loss and can be reduced by adopting low loss tangent material. Numerical results are presented to
verify the design idea.
Subjects
低溫共燒陶瓷
微帶線
轉接器
波導管
LTCC
microstrip line
transition
waveguide
Type
thesis
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