Design of 2-in-1 Bandpass Filter and Filtering Antennas for Millimeter-Wave Applications
Date Issued
2015
Date
2015
Author(s)
Su, Yi-Wen
Abstract
This thesis proposes new design concepts for millimeter-wave 2-in-1 filters and filtering antennas based on substrate integrated waveguide (SIW) cavities implemented on low temperature co-fired ceramic (LTCC) substrates. First 2-in-1 bandpass filter is designed at millimeter wave frequency. By replacing the final stage resonator and the output ports with antennas, a 2-in-1 filtering antenna can then be realized. For the design concept of the 2-in-1 bandpass filter, it combines two filters with common dual modes resonators in order to reduce the size of circuit. Due to the concept of modal orthogonality in the SIW cavities, it could not only control the filter responses in different paths by different modes, but also prove well isolation to different path. Different from general filters, the design of 2-in-1 bandpass flter reduces half of cavities and achieves circuit area miniaturization. The center frequency of this two-in-one bandpass filter is 73.5GHz, fractional bandwidth is 6.8%, and the final circuit area 1.15 λg × 1.16 λg and has 31.2% size reduction. Following the design of 2-in-1 bandpass filter, the design of 2-in-1 filtering antenna is also proposed. First, filtering antenna using 〖TE〗_201mode and 〖TE〗_102 mode are designed separately. The two filtering antenna circuits can be further combined using common dual mode cavity. The design concept also keeps the modal orthogonality so that the filter response could be controlled independently. The filtering antenna acts at 73.5GHz, for fractional bandwidth is 6.8%, and the final circuit area 2.01 λg × 1.92 λg and has 38.2% size reduction.
Subjects
substrate integrated waveguide
low temperature co-fired ceramics
modal orthogonality
bandpass filter
filtering antenna
Type
thesis
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