Design of Millimeter-Wave Multilayer Substrate Integrated Waveguide Bandpass Filters
Date Issued
2007
Date
2007
Author(s)
Lin, Tsung-Yi
DOI
zh-TW
Abstract
This thesis proposed two types of multilayer substrate integrated waveguide (SIW) bandpass filter’s structures in a multilayer low-temperature co-fired ceramic (LTCC) structure. In the feeding structure, we use a λg/4 microstrip line open stub to excite the resonator through coupling slot etched in the top metal layer of the cavity.
First we design waveguide filters with Chebyshev response. The direct coupling paths between vertically stacked cavities are achieved by narrow slots etched in the common metal layer. In order to efficiently couple two adjacent cavities, the position of the slot should largely interrupt surface current of the cavity. Compare with planar waveguide filters, the filters size can be reduced by appropriate arrangement of the vertically stacked cavitys.
Another type of the waveguide filters with quasi-elliptical response is realized by cross couple path. In general, electric fields coupling is used for cross couple. Here we use transmission line couple structure for cross couple path. In the waveguide filters with quasi-elliptical response, vertically stacked cavities can be achieved by this kind of cross coupling structure . and the circuit area can be reduced to a single cavity size.
The center frequency of the two filters are design at 60.5GHz and 30GHz with fractional bandwidth 6% and 10%. All the filters are fabricated by LTCC technology, and they exhibit an insertion loss better than 3.4dB at the center frequency and a rejection larger than 15dB over the pass band.
Subjects
基板合成波導
濾波器
柴比雪夫響應
準橢圓函數
低溫共燒陶瓷
SIW
filter
Chebyshev response
quasi-elliptic function
LTCC
Type
thesis
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