Microwave Filter design, Applications to BPF ,Application to LPF, Application to dual stopband filter, Band-pass filters

Microwave Filter design

              There is a vast amount of published literature on the design of microwave filters from which some are highly mathematical. Fortunately there are some relatively straight forward procedures which enable us to design certain useful classes of microwave filters. Filter designing using the image parameter method consist of a cascade of simpler two-port filter sections to provide the desired cutoff frequencies and attenuation characteristics but do not allow the specification of a frequency response over the complete operating range.

Microwave Filters,Lumped - element LC filters , Planar filters, Coaxial filters, Cavity filters, Dielectric filters and Electro acoustic filters

Lumped - element LC filters

An LC tank circuit consisting of parallel or series inductors and capacitors is a best example of a simplest resonator structure. These LC tank circuits have the advantage of being very compact & small in size, but having the low quality factor of the resonators which leads to relatively poor performance. 

Figure: Commercial photograph of Lumped-element LC filters.

Introduction, Microwave filters, Filter and There are mainly four types of filters with respect to functions

  Microwave filters

   Introduction

          A filter is a two-port network used to control the frequency response at a certain pointin an RF or microwave system by providing transmission at frequencies within the passbandof the filter and attenuation in the stopband of the filter.

Microwave filters represent a class of electronic filter design to operate on signals in the MHz to GHz frequency ranges. This frequency range is the range used by most broadcast radio, television, wireless communications like Cell phone, Wi-Fi, Wi-Max and the most radio frequency and microwave devices will include some kinds of filtering on the signals transmitted or received.

Theoretical Background and Microwave Transmission lines Theories

 Introduction:

Recently EBGSs have occupied significant portions of microwave engineering literature to enhance the performance of many microwave devices and components. The nomenclature EBG is actually used in the optical communication. Recently they are scaled down to RF engineering. They are very old concepts in terms of periodic structures. EBG structures are periodic in nature.

Application of microwave engineering, Microwave Transmission lines and Microwave filters

            In microwave engineering high frequency and short wavelength make unique opportunities for the microwave systems. This is because of following consideration:

§  Antenna gain is proportion to the electrical size of the antenna. At higher frequencies, more antenna gain is therefore possible for a given physical antenna size, which has important consequences for implementing miniaturized microwave system.

Introduction of Frequency range of waves and Frequency Band Designation

  Introduction:

The microwave refers to an alternating current signals with frequencies between 300 MHz and 300 GHz with corresponding electrical wavelength between λ = c/f = 1m and λ = 1mm respectively. It is quite impossible to solve microwave network problem using standard circuit theory directly but standard circuit theory is an approximation of the broader theory of electromagnetism as described by Maxwell’s equations.

Gas Turbine Power Plant Modelling for Operation Training

           The $11.4 billion worth of non-aviation gas turbines produced in 2008, $9.6 billion—more than 80 percent—were for electrical generation (Langston, 2008). Particularly, in Mexico, about 15% of the installed electrical energy (no counting the electricity generated for internal consuming by big enterprises) is based on gas turbine plants (CFE web page), either working alone or in combined cycle power plants (and 8% produced directly by gas turbines) that offers an important roll in improving power plant efficiency with its corresponding gains in environmental performance (Rice, 2004).

The Biased p-n Junction

     An externally applied potential will alter the potential difference between the p- and n-regions. This in turn will modify the flow of majority carriers, so that the junction can be used as a “gate”. If the junction is forward biased by applying a positive voltage V to the p-region Fig. , its potential is increased with respect to the n-region, so that an electric field is produced in a direction opposite to that of the built-in field.

THE IGFET/MOSFET

The second (and most important) family of FETs are those known under the general title of IGFET or MOSFET. In these FETs, the gate terminal is insulated from the semiconductor body by a very thin layer of silicon dioxide, hence the title ‘Insulated Gate Field Effect Transistor,’ or IGFET. Also, the devices generally use a ‘Metal-Oxide Silicon’ semiconductor material in their construction, hence the alternative title of MOSFET.

ALTERNATOR UNIT REPAIR AND ALTERNATOR

Disconnect grounded cable at battery before removing or attaching battery cable at alternator output terminal. Otherwise, a tool shorted to the battery cable at the output terminal can quickly heat enough to cause a skin burn or damage the tool or cable.

Multiple Impulse Method (SIM/MIM)

       The Multiple Impulse Method is the most advanced cable fault prelocation method available.

Every cable fault that is either a high resistive or intermittent fault can not be indicated by means of the TDR method. The low voltage impulse sent out by the Time Domain Reflectometer is not reflected at the faulty position, as the fault impedance compared to the insulation impedance of the healthy part of the cable is not significantly lower.