Air Bridge

Much has been written about the famous fighters and bombers of the Luftwaffe which proved so successful in the invasion of Poland, the Battle of France, the Battle of Britain and in the early operations in Eastern Europe. Little attention, however, has been focused on the Luftwaffe’s transport aircraft which played a vital role in supplying German forces in every theatre. In early May 1940, the battle of Norway was nearing its climax, but General Eduard Dietl’s 3rd Jäger division was blocked by the Allies in the Narvik area. Only the Luftwaffe could provide effective assistance to the encircled troops. The special purpose groups KGr.zbV107 and KGr.zbV108 were ordered to supply the division by air. Transports delivered ammunition, food, and even boots for German sailors who found themselves on land. This was the first of a number of occasions in which the Luftwaffe’s transport Gruppen, often equipped with the slow, but reliable Junkers 52, created an ‘air bridge’ to supply troops cut off or surrounded by the enemy. The transport Gruppen had previously been involved in supporting the advance of German forces during the Polish campaign, this being followed by the capture of Denmark, The Netherlands, Belgium, and Greece. During Operation Barbarossa, German troops were dispersed over the vast expanses of Russia. It was a country without roads where the normal supply by trucks and trains to the troops was difficult and sometimes impossible. Often, it was only the Luftwaffe’s transport aircraft that kept the Germans fighting. But with Hitler’s insistence that there should be no retreat despite the overwhelming strength of the Soviet forces, his Germans armies found themselves surrounded and the Luftwaffe had to create air bridges to supply the beleaguered troops. Nowhere was this more evident than the Battle of Stalingrad, Göring having convinced Hitler that the Luftwaffe was capable of keeping the Sixth Army supplied. As the war increasingly turned against the Third Reich, air bridges were vital in supporting and maintaining its garrisons in places such as Demyansk, Holm, Korsun, Budapest, Breslau, and many others. Hitler’s Air Bridges presents the story of the Luftwaffe’s transport Gruppen more extensively and in greater detail than ever before.

The tools and techniques to fully leverage coplanar technology Coplanar Microwave Integrated Circuits sets forth the theoretical underpinnings of coplanar waveguides and thoroughly examines the various coplanar components such as discontinuities, lumped elements, resonators, couplers, and filters, which are essential for microwave integrated circuit design. Based on the results of his own research findings, the author effectively demonstrates the many advantages of coplanar waveguide technology for modern circuit design. Following a brief introductory chapter, the text thoroughly covers the material needed for successful design and realization of coplanar microwave circuits, including: * Fundamental transmission properties of coplanar waveguides using a full wave analysis * Detailed analysis of most discontinuities used in coplanar waveguide design * Lumped elements in coplanar technology that are needed in circuit design * Development of software for coplanar circuit design, including a CD-ROM containing a test version of the software for modeling coplanar circuit components and circuits * Application of derived results to build more complex components such as lumped element filters, waveguide filters, millimeter wave filters, end-coupled waveguide structures, waveguide couplers, and Wilkinson couplers for different frequency ranges in coplanar technology The final chapter focuses on special coplanar microwave integrated circuits that have been developed using the software presented in the text. The book concludes with a thought-provoking discussion of the advantages and disadvantages of the coplanar technique. Extensive use of figures and tables helps readers easily digest and visualize complex concepts. A bibliography is included at the end of each chapter for further study and research. Coplanar Microwave Integrated Circuits is recommended for graduate students and engineers in RF microwaves who want to reap all the advantages and possibilities of coplanar technology.

Up-to-date coverage of the analysis and applications of coplanar waveguides to microwave circuits and antennas The unique feature of coplanar waveguides, as opposed to more conventional waveguides, is their uniplanar construction, in which all of the conductors are aligned on the same side of the substrate. This feature simplifies manufacturing and allows faster and less expensive characterization using on-wafer techniques. Coplanar Waveguide Circuits, Components, and Systems is an engineer's complete resource, collecting all of the available data on the subject. Rainee Simons thoroughly discusses propagation parameters for conventional coplanar waveguides and includes valuable details such as the derivation of the fundamental equations, physical explanations, and numerical examples. Coverage also includes: Discontinuities and circuit elements Transitions to other transmission media Directional couplers, hybrids, and magic T Microelectromechanical systems based switches and phase shifters Tunable devices using ferroelectric materials Photonic bandgap structures Printed circuit antennas

Pneumatic and Hydraulic Components and Instruments in Automatic Control covers the proceedings of the International Federation of Automatic Control (IFAC) Symposium. The book reviews papers that tackle topics relating to the use of pneumatic and hydraulic equipment in automatic control. This text discusses topics such as dynamic behavior analysis of pneumatic components by numerical techniques and application of bond graphs to the digital simulation of a two-stage relief valve dynamic behavior. Topics including mathematical modeling of cavitation in hydraulic pumps; pro and contra electro-fluid analogies in digital simulation of fluid circuits; and improvement in accuracy of pneumatic delay are covered as well. This book will be of great use to researchers and professionals whose work involves the designing of automatic control systems.