Analysis and implementation of different topologies of transversal filters in planar technology

This paper uses a simple configuration to implement microwave transversal filters based on microstrip technology. The structure is of second order and implements two transmission zeros and two reflection zeros in the frequency response of the filter. The basic configuration consists of input and output ports coupled in a shunt configuration to two printed resonators of different lengths. A modification of the original structure is introduced to allow an additional direct coupling between the source and the load. Depending on the value and the sign of the coupling terms, different frequency responses can be obtained. In this way, small modifications in the basic structure allow to obtain band-pass or band-stop responses. Following this circuit topology, the paper discusses the possibilities to have transmission zeros in the real or in the complex plane and their effects on the frequency response and on the group delay of the filter. Also, two practical implementations in microstrip technology are proposed, and a third filter implementing group delay equalization is demonstrated. Measured results confirm theoretical predictions and validate the structures for practical applications.Ministerio de Educación y Ciencia, Ref. TEC2007-67630-C03-02. Fundación Séneca, Ref. 08833/PI/0

Induction quenching and tempering and optimization of mechanical properties of rolled bars of 31CrMoV9 nitriding steel

Předložená bakalářská práce se zabývá indukčním zušlechťováním a optimalizací mechanických vlastností válcovaných tyčí z nitridační oceli 31CrMoV9. Teoretická část je věnována specifikaci odlévání oceli, válcování a tepelnému zpracování oceli a porovnání dostupných metod zušlechťování oceli. Pro experimentální část byly odválcovány kruhové tyče ve třech různých průměrech (32, 52 a 73 mm) a pro zušlechtění byly navrženy tři různé diagramy s rozdílnou teplotou popouštění. Na základě těchto výsledků mechanických a strukturních vlastností bude optimalizována technologie zušlechtění dle požadavků zákazníka.This bachelor thesis deals with the induction refining and optimization of mechanical properties of rolled nitriding steel bars 31CrMoV9. The theoretical part is dedicated to the casting of steel, rolling and heat treatment of steel, and the comparison of the available methods of steel refining. For the experimental part, round bars were rolled in three different diameters (32, 52 and 73 mm) and three different diagrams with different tempering temperatures have been arranged for their refining. Based on the results of the mechanical and structural properties, the technology of refining will be optimized according to the customer´s requirements.633 - Katedra tváření materiáluvelmi dobř

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2.2 Caramel Syrup Example—Structure........................