Microstrip Line to Substrate Integrated Waveguide Transition and Antenna Applications
Date Issued
2007
Date
2007
Author(s)
Yau, Chyi-kwei
DOI
zh-TW
Abstract
This thesis proposes two kinds of vertical transitions between microstrip line and substrate integrated waveguide (SIW), and a slot array antenna feeding by our transition structure. All these structures are fabricated on low-temperature co-fired ceramic (LTCC) substrate. This thesis also presents the equivalent circuits of both transition structures. The microstrip line is on the upper layer, and the SIW is on the bottom layer with the vertical metal walls realized by closely spaced vias.
The first transition design is realized by a shorted via between the end of the microstrip line and the bottom layer of SIW. A current is induced on the via and energy is coupled to SIW.
Another transition structure is realized by opening a slot on the top wall of SIW and feeding by a 1/4λg microstrip line open stub. With the magnetic current induced on the slot, the transition is achieved. The design of slot array antenna is also achieved by opening slots on SIW, and the power is radiated from the slots. The radiated power and center frequency are adjusted by the slot position and slot length.
All our structures are designed at Ka-band. Both the transition structures exhibit about 40% fractional bandwidth with -15dB return loss and the measurement results agree with our simulation.
Subjects
轉接
基版合成波導
微帶線
transition
SIW
microstrip line
Type
thesis
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