Book•
Waveguide Components for Antenna Feed Systems: Theory and CAD
01 Dec 1993-
TL;DR: In this paper, the authors present an in-depth examination of the three basic field-theoretical methods used for the design aid of different waveguide components and present CAD algorithms, examples of their applications, and operational principles of various components used in antenna feed systems.
Abstract: This book delivers an in-depth examinations of the three basic field-theoretical methods used for the design aid of different waveguide components You'll find CAD algorithms, examples of their applications, and operational principles of various components used in antenna feed systems
Citations
More filters
TL;DR: In this paper, the concept of the conventional coupling matrix is extended to include designs of dual-and triple-band filters and the multiband response is created by either placing transmission zeros within the bandwidth of a wideband filter or using higher order resonances.
Abstract: The concept of the conventional coupling matrix is extended to include designs of dual- and triple-band filters. The multiband response is created by either placing transmission zeros within the bandwidth of a wideband filter or using higher order resonances. Realizable topologies both in planar and waveguide technologies can be imposed and associated coupling coefficients enforced during optimization. The design process is verified by measurements and comparison with results of commercially available field solvers
208 citations
Cites background from "Waveguide Components for Antenna Fe..."
...Folded waveguide filters make use of higher order resonances in addition to the dual-band design, whereas the dual-band effect in inline configurations is created because of higher order resonances....
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Patent•
17 Mar 2010
TL;DR: In this article, an improved single antenna system that allows reception of RF energy at multiple frequencies is presented, which is capable of providing movement such that the feed horn with the LNB is at a focal point with the primary reflector for both Ka and Ku band reception.
Abstract: The present invention provides an improved single antenna system that allows reception of RF energy at multiple frequencies. In one embodiment, the antenna is implemented as a multi-beam, multi-feed antenna having a primary reflector fitted with a dual mode feed tube and a switchable LNB that supports both Ka band and Ku band reception. In another embodiment, the antenna is implemented as a multi-beam, multi-feed antenna having a primary reflector fitted with a feed horn and a LNB that is capable of providing movement such that the feed horn with the LNB is at a focal point with the primary reflector for both Ka and Ku band reception. In another embodiment, the antennae is implemented as a multi-beam, multi-feed antenna having a primary reflected fitted with a feed horn assembly and a switchable LNB that supports both Ka band and Ku band reception.
204 citations
TL;DR: This design procedure takes into account the effects of dispersion and spurious modes and, as a result, the overall design and final tuning time can be significantly reduced.
Abstract: Following a brief review of different types of multiplexer configurations, a systematic design approach has been outlined for the design of manifold-coupled multiplexers. The piecewise approach, optimizing parts of the multiplexer separately in repeated cycles while converging upon an optimal solution, has proved to be very effective for most practical applications. The technique is readily applicable to manifold multiplexers incorporating an arbitrary number of channels, regardless of their bandwidths and channel separations. There are no restrictions on the design and implementation of channel filters onto the manifold; they may be asymmetric, and may incorporate transmission zeros, group delay equalization zeros, or both. The manifold itself is a transmission line, be it a coaxial line or a rectangular waveguide or some other low-loss structure. The costly EM simulation is used economically on manifold junctions and channel filters through the use of space-mapping optimization techniques, where EM-based simulators are used to fine-model each multiplexer channel and coupling matrix representation is used to coarse-model the performance. Fine details such as tuning screws may be included in the design process. This design procedure takes into account the effects of dispersion and spurious modes and, as a result, the overall design and final tuning time can be significantly reduced.
181 citations
Cites background from "Waveguide Components for Antenna Fe..."
...Multiplexer Configurations Over the past three decades, there have been many advances in the design and implementation of multiplexing networks [1]–[23]....
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...A more comprehensive review of waveguide (de)multiplexing systems—including practical information, design formulae, and a good bibliography—may be found in [1]....
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TL;DR: In this paper, a single-layer, wideband, and low-loss corporate-feed networks for slot antenna arrays are described, where the antenna is built using ridge gap waveguide technology, formed between two parallel metal plates.
Abstract: Single-layer, wideband, and low-loss corporate-feed networks for slot antenna arrays are described. The antenna is built using ridge gap waveguide technology, formed between two parallel metal plates without the requirements of electrical contact between these plates. The corporate-feed network is realized by a texture of pins and a guiding ridge in the bottom plate, and the radiating slots are placed in the smooth top plate. The paper describes two test antennas: a 4 $\,\times\,$ 1 linear slot array and a 2 $\,\times\,$ 2 planar slot array. Both have been fabricated and tested at Ku- band. The linear array shows more than 20% bandwidth and the 2 $\,\times\,$ 2 array shows a bandwidth of 21% for 10-dB return loss. There are good agreements between measured and simulated patterns for both antennas. Measured gain for the planar array is found to be at least 12.2 dBi over 12–15 GHz band.
166 citations
Additional excerpts
...This technique is well described in [28]....
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TL;DR: In this paper, a rotary joint design for high-power applications is presented for single-channel waveguide rotary joints, which reduces the diameter of the rotary ring by tapered ridged waveguide sections.
Abstract: A new design for single-channel waveguide rotary joints for high-power applications is presented. In order to obtain correct signal phase conditions along the ring and, at the same time, reduce the diameter of the rotary joint, tapered ridged waveguide sections are introduced. Design guidelines with respect to general transmission characteristics, H-plane aperture couplers, and ridge waveguide analysis are presented. Measurements of a 9.05-GHz prototype show less than 1-dB insertion loss over a 250-MHz bandwidth and, hence, verify the design concept.
164 citations
Cites background or methods from "Waveguide Components for Antenna Fe..."
..., according to [2] and [3], thus, providing full power transfer from the input to the output via the center ring....
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...For this purpose, a modified algorithm based on the modematching technique (MMT) has been developed [3], and initial coupler values were obtained using principles described in [2] and [4]....
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