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This paper presents a new type of cross coupled low loss and high selectivity bandpass filter operating at millimeter wave band. The filter is designed based on groove gap waveguide technology. A Ka-band 4th-order bandpass filter is proposed, designed and fabricated. Cross coupling between a one pair of non-adjacent resonators has been introduced to produce two transmission zeros at the frequencies...
A four-pole substrate integrated waveguide (SIW) filter at Ka band is designed for satellite communication systems. The filter contains four SIW cavity resonators which are made of a substrate with metalized via holes. A transmission zero at the low-frequency side of the pass band is produced by the negative coupling that provided by TE102 mode in the second cavity resonator. The selectivity on the...
This paper proposes a miniaturized bandpass filter using dual-mode double-folded laminated waveguide cavity resonators on a multilayer low temperature co-fired ceramic (LTCC) substrate. The double-folded cavity is constructed by inserting a metal plate with an L-shape slot at the vertical center of the cavity. By changing the extra metal plate size along the folded side, the frequency ratio of resonant...
Microwave filters and couplers embedded in low temperature co-fired ceramic (LTCC) substrates for system in package (SiP) applications are proposed in this paper. Taking advantages of the multilayer nature of LTCC, laminated waveguides and cavities can be flexibly arranged and embedded in the substrate to minimize either the area occupation or interference between different components. With the multimode...
This paper describes a synthesis method for quadruple-passband microwave filters. A frequency transformation method is developed for finding the locations of poles and zeros of the filter response. An eight-pole microstrip quadruple-passband filter is synthesized for validation, with designed pass bands at 1.85–1.88, 1.943–1.97, 2.03–2.057, and 2.12–2.15 GHz. The filter is realized in microstrip and...
An efficient method for designing multi-band filters with compact size, high selectivity, and multi-order spurious mode suppression has been proposed in this paper. The design concept is to add some extra coupled resonator sections in a single-circuit filter to increase the degrees of freedom in extracting coupling coefficients between resonators and, therefore, the filter is capable of realizing...
A visual pallet recognition system based on the accurate color segmentation is proposed. The basic idea is to get the pallet color feature samples from the images in working environment before the autonomous mobile forklift works. Then the algorithms of morphological filtering, Sobel edge detection and Hough transform are used to get the pallet forking side. At last, according to two corners of the...
A miniaturized bandpass filter with 4th order Chebyshev responses is proposed in this paper. The filter is designed using laminated waveguide cavity resonators on a low temperature co-fired ceramic (LTCC) substrate. Miniaturization is accomplished by folding a square cavity with respect to its three symmetric axes. Besides, useful coupling structure is also proposed. With the proposed coupling structures,...
A dual passband filter using both microstrip and CPW resonators is proposed. The CPW resonators are embedded into the microstrip resonators to miniaturize the filter size. The cross coupling between the input and output resonators is introduced to exhibit a pair of transmission zeros in the two sides of the pass band, thus increasing the selectivity. An experiment has done for this filter, and the...
This paper proposes a four-pole quasi-elliptic waveguide filter using multilayer low-temperature cofired ceramic (LTCC) technology. The cavities of the filter can be stacked vertically, while a pair of through hole vias are used to realize the cross coupling path for the quasi-elliptic response. Thus, the circuit size can be reduced by the overlap of the cavity resonators. The proposed filter has...
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