1,721,034 research outputs found
Three-Step Monoblock Waveguide Twist
No full textTwists are widespread devices among waveguide systems and assemblies. Their usefulness lies into the chance to interconnect sections with different orientation angles. Twists are often integrated directly into dual polarization systems, multiplexers and antenna feeds. Performance, compactness and costs are usually in trade-off but all of them need to be privileged to deliver a successful waveguide-based system. The novel approach proposed in this manuscript deals with the manufacturing of a wideband gradual rotation by means of three sections which can however be carved from a metallic monoblock through very standard milling process. This achievement is based on geometrical observations and on CNC milling procedures. The proposed concept is then verified with a 90° twist based on standard WR75 with promising performance in terms of matching and losses
Bandpass filter with multiple selective absorptive stopbands for 28 GHz transmitters
No full textThis manuscript presents a novel design for an absorptive bandpass filter for mm-wave applications, specifically the commercial FR2 spectrum. Three bands have been selected to be properly input matched with only one of them being the passband, where the insertion loss is minimized. The proposed approach relies on a multiplexer topology implemented through microstrip lines and on thin-film manufacturing process on alumina to shrink the footprint. Cascades of half-wavelength C-shape open-ended resonators are exploited to create the matched bands and define the filter's selectivity. The selected passband spans from 26.5 to 28.5 GHz, with a measured maximum insertion loss of 3.05 dB for a -3 dB fractional bandwidth of 7.3%. Two absorptive bands are realized to match signals at 24 and 32.25 GHz. The alumina die footprint is 5500 x 3440 mu m2, compatible with immediate integration within a mm-wave lineup
Multilayered Integration of Microwave Components by Substrate Integrated Waveguide Technology
No full textAnalytical Synthesis of Fully Canonical Cascaded-Doublet Prototype Filters
Full text linkThis letter presents an analytical procedure for the synthesis of a low-pass prototype filter constituted by the cascade of doublet blocks coupled by inverters or shunt reactances. The considered doublet is a second-order resonating structure composed of two resonant and two nonresonant nodes which allow the placement of two finite transmission zeros (TZs) in the frequency response. The considered configuration allows realizing compact fully canonical filters with the maximum number of TZs (the doublets are typically implemented through dual-mode cavities). The proposed procedure introduces for the first time an analytical procedure for synthesizing the low-pass prototype of the cascaded-block topology, overcoming the time consuming and inaccurate procedures currently based on numerical optimization. Two synthesis examples are presented to validate the novel synthesis procedure
Direct Analytical Synthesis of Broadside Inline Antenna Arrays
No full textThis work proposes an analytical method to synthesize inline series-fed arrays as cascade of several 2-port sections. Starting from one electromagnetic simulation of a core element, several identical elements are then cascaded by suitable interconnecting transmission lines, thus synthesizing the array without further optimizations. The technique is valid at a single frequency, but also constitutes a good starting point for subsequent bandwidth enlargement. A complete design example, simulated and measured on microstrip technology, validates the method for a 31 GHz 5-element array
Innovative manufacturing approach for paper-based substrate integrated waveguide components and antennas
No full textPaper-based Substrate Integrated Waveguide Technology for the Future Generation of Eco-friendly Microwave Components
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Substrate Integrated Folded Waveguide Filter with Out-of-Band Rejection Controlled by Resonant-Mode Suppression
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