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- Kildal, Per-Simon, 1951-, et al.
(författare)
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Analysis of nearly cylindrical antennas and scattering problems using a spectrum of two dimensional solutions
- 1996
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Ingår i: IEEE Transactions on Antennas and Propagation. ; 44:8, s. 1183-1192
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a powerful method to analyzeantennas which can be considered principally two-dimensional(2-D) or cylindrical, except for some three-dimensional (3-D)physical or equivalent sources, e.g., dipoles or slots. It is shown byFourier transform techniques that such antennas can be analyzedas 2-D problems with harmonic longitudinal field variation. Theradiation pattern can often be determined directly from a finiteset of such 2-D solutions, each one obtained by any method, e.g.,the moment method. The mutual interaction between the cylindrical scatterer and the sources must be calculated to determine theexact current distribution on the sources and their impedances oradmittances. This is facilitated by performing an inverse Fouriertransform of an infinite spectrum of the numerical 2-D solutionsfollowed by a moment method solution in the spatial domain tosatisfy the boundary conditions on the 3-D equivalent sourcesthemselves. The inverse Fourier transform is simplified by theuse of asymptote extraction. The method is in itself a hybridtechnique as one method is used to solve the harmonic 2-Dproblem, and the other to solve for the source currents
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- Rahiminejad, Sofia, 1987-, et al.
(författare)
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Micromachined Ridge Gap Waveguide and Resonator for Millimeter-Wave Applications
- 2012
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Ingår i: Sensors and Actuators A: Physical. - 0924-4247. ; 186:Special Issue: SI, s. 264-269
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Tidskriftsartikel (refereegranskat)abstract
- The ridge gap waveguide is a fundamentally new high-frequency waveguide. It does not need any electrical contact between the split blocks which gives it an advantage compared to the rectangular waveguide which is the standard today. These waveguides are conventionally fabricated by milling, although above 100 GHz milling is not adequate anymore. MEMS technology on the other hand, can offer high-precision fabrication and thus opens the path for new types of high-frequency components. In this paper both a ridge gap waveguide and a ridge gap resonator have been fabricated for the frequencies 220-325 GHz using M EMS technology. Support packages have been designed to enable device measurements. Simulations show that the reflection coefficient for the ridge gap waveguide is below -15 dB between 240 and 340 GHz. Two resonance peaks were measured at the frequencies 234 GHz and 284 GHz for the ridge gap resonator with unloaded Q-values of 336 and 527 respectively. Both the waveguide and resonator have the potential to obtain similar performances as the rectangular waveguide without strict requirement on electrical contact, allowing simplified fabrication and assembly technique.
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- Zaman, Ashraf Uz, 1975-, et al.
(författare)
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Narrow-Band Microwave Filter Using High-Q Groove Gap Waveguide Resonators With Manufacturing Flexibility and No Sidewalls
- 2012
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Ingår i: IEEE Transactions on Components, Packaging, and Manufacturing Technology. - 2156-3950. ; 2:11, s. 1882-1889
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a new type of narrow band filter with good electrical performance and manufacturing flexibility, based on the newly introduced groove gap waveguide technology. The designed third and fifth-order filters work at Ku band with 1% fractional bandwidth. These filter structures are manufactured with an allowable gap between two metal blocks, in such a way that there is no requirement for electrical contact and alignment between the blocks. This is a major manufacturing advantage compared to normal rectangular waveguide filters. The measured results of the manufactured filters show reasonably good agreement with the full-wave simulated results, without any tuning or adjustments.
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