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For the first time, a 3-dimentional (3-D) transmission line dual-mode resonator is proposed by using the low temperature co-fired ceramic (LTCC) technology. The proposed dual-mode resonator is reasonably folded in both vertical and horizontal directions for constructing a miniaturized bandpass filter (BPF), which overcomes the vital shortcoming of large circuit size of the LTCC distributed-element...
Controllable common-mode transmission zero is proposed to improve the common-mode rejection ratio (CMRR) inside the differential-mode passband of differential bandpass filters. With the controllability of the common-mode transmission zero, the common-mode transmission zero can be moved into the frequency range of the differentialmode passband, and then the CMRR inside the differentialmode passband...
We present fundamental approaches for realizing coherent two dimensional quantum cascade laser arrays by utilizing ring cavity surface emitting lasers. In this work we describe the design and fabrication as well as the electro-optical characterization.
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