K/sub a/- and V-band MMIC components for personal communication networks

Wenger, J.; Splettstober, J.

doi:10.1109/mwsym.1996.510980

Cited by 10 publications

(16 citation statements)

References 12 publications

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“…In the last decade, fruitful research has been made, especially in terms of designing new millimeter‐wave circuits operating over the V‐band, in a planar technology, because of their easy fabrication and low‐cost: Monolithic Microwave Integrated Circuits [2, 3] and Miniature Hybrid Microwave Integrated Circuit technology on very thin ceramic substrate [4–6]. However, components such as antennas, filters, and oscillators based on waveguide technology are often required to build set‐ups or for their good quality factor (HQ).…”

Section: Introductionmentioning

confidence: 99%

V‐band millimeter‐wave microstrip to rectangular waveguide transition

Hammou

Nedil

Kandil

et al. 2013

Micro & Optical Tech Letters

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This article proposes a novel millimeter‐wave microstrip (MSL) to WR 12 standard rectangular waveguide transitions. These dissimilar structures are interconnected via a substrate integrated waveguide (SIW). The MSL and the SIW are integrated on the same ceramic substrate of 9.9 relative permittivity and 125 μm thickness. The MSL was first transformed into an air‐filled rectangular waveguide, and then a stepped impedance or horn transformer was used to match the WR12 standard rectangular waveguide. The central frequency of operation is 61 GHz as required in V‐band wireless communications applications. Commercial Finite Element Method Software and High Frequency Structure Simulator (HFSS) was used to perform the design and the optimization. The S parameter measurements of the back‐to‐back connected transitions show an insertion loss less than 1.5 dB and a return loss better than −10 dB over a 4 GHz band from 60 to 64 GHz. The high performance, the compact size, and the simple fabrication, enable similar transitions to be employed in a number of other millimeter‐wave applications. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1696–1700, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27658

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Section: Introductionmentioning

confidence: 99%

V‐band millimeter‐wave microstrip to rectangular waveguide transition

Hammou

Nedil

Kandil

et al. 2013

Micro & Optical Tech Letters

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Section: Introductionmentioning

confidence: 99%

“…Uniquely Hsaturated graphs were introduced by Cooper, Lenz, LeSaulnier, Wenger, and West [9] where they classified uniquely C k -saturated graphs for k ∈ {3, 4}; in each case there is a finite number of graphs. Wenger [26,27] classified the uniquely C 5 -saturated graphs and proved that there do not exist any uniquely C k -saturated graphs for k ∈ {6, 7, 8}.In this paper, we focus on the case where H = K r , the complete graph of order r. Usually K r is the first graph considered for extremal and saturation problems. However, we find that classifying all uniquely K r -saturated graphs is far from trivial, even in the case that r = 4.Previously, few examples of uniquely K r -saturated graphs were known, and little was known about their properties.…”

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confidence: 99%

Uniquely $K_r$-Saturated Graphs

Hartke

Stolee

2012

Electron. J. Combin.

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A graph G is uniquely K r -saturated if it contains no clique with r vertices and if for all edges e in the complement, G + e has a unique clique with r vertices. Previously, few examples of uniquely K r -saturated graphs were known, and little was known about their properties. We search for these graphs by adapting orbital branching, a technique originally developed for symmetric integer linear programs. We find several new uniquely K r -saturated graphs with 4 ≤ r ≤ 7, as well as two new infinite families based on Cayley graphs for Z n with a small number of generators. IntroductionA graph G is uniquely H-saturated if there is no subgraph of G isomorphic to H, and for all edges e in the complement of G there is a unique subgraph in G + e isomorphic to H 4 . Uniquely Hsaturated graphs were introduced by Cooper, Lenz, LeSaulnier, Wenger, and West [9] where they classified uniquely C k -saturated graphs for k ∈ {3, 4}; in each case there is a finite number of graphs. Wenger [26,27] classified the uniquely C 5 -saturated graphs and proved that there do not exist any uniquely C k -saturated graphs for k ∈ {6, 7, 8}.In this paper, we focus on the case where H = K r , the complete graph of order r. Usually K r is the first graph considered for extremal and saturation problems. However, we find that classifying all uniquely K r -saturated graphs is far from trivial, even in the case that r = 4.Previously, few examples of uniquely K r -saturated graphs were known, and little was known about their properties. We adapt the computational technique of orbital branching into the graph theory setting to search for uniquely K r -saturated graphs. Orbital branching was originally introduced by Ostrowski, Linderoth, Rossi, and Smriglio [20] to solve symmetric integer programs. We further extend the technique to use augmentations which are customized to this problem. By executing this search, we found several new uniquely K r -saturated graphs for r ∈ {4, 5, 6, 7} and we provide constructions of these graphs to understand their structure. One of the graphs we discovered is a Cayley graph, which led us to design a search for Cayley graphs which are uniquely K r -saturated. Motivated by these search results, we construct two new infinite families of uniquely K r -saturated Cayley graphs.Erdős, Hajnal, and Moon [10] studied the minimum number of edges in a K r -saturated graph. They proved that the only extremal examples are the graphs formed by adding r − 2 dominating vertices to an independent set; these graphs are also uniquely K r -saturated. However, if G is uniquely K r -saturated and has a dominating vertex, then deleting that vertex results in a uniquely K r−1 -saturated graph. To avoid the issue of dominating vertices, we define a graph to be r-primitive if it is uniquely K r -saturated and has no dominating vertex. Understanding which r-primitive graphs exist is fundamental to characterizing uniquely K r -saturated graphs.Since K 3 ∼ = C 3 , the uniquely K 3 -saturated graphs were proven by Cooper et al.[9] to be stars an...

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“…15.3c industrial standard has been recently introduced for WPLAN [1]. In the last decade some initial research has been made, especially in terms of designing new millimeter wave components operating over the V-band [2][3][4][5][6][7]. The Miniaturized Hybrid Microwave Integrated Circuit (MHMIC) technology is a promising technology for prototyping and small-scale production.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of a Modified V-Band MHMIC Six-Port Circuit

Hammou

Moldovan

Tatu

2010

Journal of Electromagnetic Waves and Applications

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This paper presents a modified V-band six-port circuit built on thin alumina substrate. This circuit is implemented using a rat-race and three 90 • hybrid couplers. The S parameter measurements of both couplers show wideband performances and high coupled-port phase and amplitude balance in the 57 GHz to 64 GHz frequency band, corresponding to the IEEE 802.15.3c industrial standard. Therefore, the proposed six-port exhibits good phase and amplitude balance, while maintaining a good return loss. The proposed circuits are suitable for V band high data-rate communications systems.

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K/sub a/- and V-band MMIC components for personal communication networks

Cited by 10 publications

References 12 publications

V‐band millimeter‐wave microstrip to rectangular waveguide transition

V‐band millimeter‐wave microstrip to rectangular waveguide transition

Uniquely $K_r$-Saturated Graphs

Modeling and Analysis of a Modified V-Band MHMIC Six-Port Circuit

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