P. Soto

University of Alicante, Alicante, Valencia, Spain

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Publications (27)18.33 Total impact

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    ABSTRACT: A novel multiplexer design technique which makes use of distributed models is proposed. For the first time, distributed models of dual mode filters are applied to the design of manifold multiplexers, with a large number of both contiguous or non-contiguous channels. After a brief review of the last advances in multiplexer design, the whole design process is described over a non-contiguous channel example. Finally, a contiguous channel case is presented.
    2014 IEEE/MTT-S International Microwave Symposium - MTT 2014; 06/2014
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    ABSTRACT: This paper proposes novel waveguide topologies for obtaining filter responses with arbitrary placed transmission zeros (TZs). These new structures have a good electrical behavior and allow fast simulation using EM techniques. Several topologies and their corresponding electrical models will be presented, together with amenable synthesis and design procedures. The simplicity of the layout raises these kind of filters as good candidates for useful applications requiring advanced filter characteristics.
    2014 IEEE/MTT-S International Microwave Symposium - MTT 2014; 06/2014
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    ABSTRACT: The authors have detected an error in Section IV-A in the above paper (ibid., vol. 59, no. 12, pp. 3601-3607, Dec. 2012). The analyzed rectangular waveguide in the actual version of the article is the WR137, instead of the WR90. As a consequence, the corrections presented here have to be implemented.
    IEEE Transactions on Electron Devices 01/2014; 61(1):212-212. · 2.06 Impact Factor
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    ABSTRACT: In this study, the efficient full-wave analysis of passive devices composed of circular and arbitrarily-shaped waveguides is considered. For this purpose, the well-known boundary integral-resonant mode expansion (BI-RME) method has been properly extended. Circular waveguides are used for resonant mode expansion, whereas the arbitrary contour is defined by any combination of straight, circular and elliptical segments, thus allowing the exact representation of the most widely used geometries. The proposed algorithm extends previous implementations of the BI-RME method based on circular waveguides by considering circular and elliptical arcs for defining arbitrary geometries. Similarly, it allows the efficient analysis of passive devices based on circular waveguides with arbitrary perturbations, thus providing more accurate results with less computational efforts than a rectangular waveguide-based BI-RME approach. The extended method has been successfully tested with several practical application examples, having compared its performance with the BI-RME method based on rectangular waveguides.
    IET Microwaves Antennas & Propagation 01/2013; 7(1):44-53. · 0.84 Impact Factor
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    ABSTRACT: Abstract This paper analyzes and compares voltage and power wave reflection coefficients using a visual representation which fully exploits that both coefficients are directly related to the geometry of direct inversive transformations in the extended impedance plane. In order to compare the two concepts for complex impedance ports, the 3D Smith chart tool is used in premiere. The paper gives a geometrical and more intuitive insight of these two parameters and proposes a novel tool for handling both types of reflection coefficients.
    Asia-Pacific Microwave Conference (APMC); 12/2012
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    ABSTRACT: A technique for the accurate computation of the time domain electromagnetic fields radiated by a charged distribution traveling along an arbitrarily shaped waveguide region is presented. Based on the transformation (by means of the standard Fourier analysis) of the time-varying current density of the analyzed problem to the frequency domain, the resulting equivalent current is further convolved with the dyadic electric and magnetic Green's functions. Moreover, we show that only the evaluation of the transverse magnetic modes of the structure is required for the calculation of fields radiated by particles traveling in the axial direction. Finally, frequency domain electric and magnetic fields are transformed back to the time domain, just obtaining the total fields radiated by the charged distribution. Furthermore, we present a method for the computation of the wakefields of arbitrary cross-section uniform waveguides from the resulting field expressions. Several examples of charged particles moving in the axial direction of such waveguides are included.
    Radio Science 10/2012; 47(5):5006-. · 1.00 Impact Factor
  • Microwave Journal 07/2012; 55(6-7):64-74. · 0.17 Impact Factor
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    ABSTRACT: The aim of this paper is to study the multipactor radio-frequency breakdown voltage in several ridge and multiridge waveguide configurations. First, multipactor susceptibility charts for several types of ridged waveguides have been computed using the commercial software FEST3D. Next, these charts have been used to predict multipactor threshold values for a bandpass filter and a quasi-low-pass filter both containing ridge waveguide sections. Furthermore, multipactor simulations using FEST3D are carried out to calculate the multipactor threshold of the aforementioned structures. A good agreement between predictions and simulations has been found for both filter examples.
    IEEE Transactions on Electron Devices 01/2012; 59(12):3601-3607. · 2.06 Impact Factor
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    ABSTRACT: In this paper, propagation losses effects present in rectangular waveguide structures are rigorously considered. For this purpose, a new formulation based on the perturbation of the boundary conditions on the metallic walls of the waveguides combined with an Integral-Equation (IE) analysis technique is proposed. Following this advanced technique, the drawbacks of the classical power-loss method are overcome and a complex modal propagation constant is computed. To validate this theory, we have successfully compared our results with numerical data of lossy hollow waveguides. Next, a Computed-Aided-Design (CAD) software package based on such a novel modal analysis tool has been used to predict the propagation losses effects in a 2-pole symmetric bandpass filter.
    Microwave Workshop Series on Millimeter Wave Integration Technologies (IMWS), 2011 IEEE MTT-S International; 10/2011
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    ABSTRACT: This letter proposes a spherical 3-D Smith Chart suitable for representing both active and passive microwave circuits. Using the mathematical concept of the Riemann sphere, the extended reflection coefficient plane is transformed into the surface of the unit sphere. Since the proposed Smith Chart compiles the whole complex plane, all possible loads are included. A simple graphic tool is thus obtained that successfully unifies active and passive circuits. In addition, lossy lines with complex characteristic impedances can also be represented. The letter presents the 3-D Smith Chart, provides its main governing equations, and also enumerates its more important properties.
    IEEE Microwave and Wireless Components Letters 06/2011; 21(6):286-288. · 1.78 Impact Factor
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    ABSTRACT: Most of the circuit prototypes used in practical applications were proposed many decades ago, when the present computational resources were not available. Simplicity was a key factor in their conception. Although these traditional prototypes model the real structures, they usually neglect second-order effects, the frequency dependence of the filter parts and, in some cases, they do not have an exact correspondence with the physical structure. All of these inaccuracies can affect the equivalence between the prototype and the real filter, thus degrading the initial structure extracted from the synthesized prototype. Optimizations carried out from poor initial dimensions are computationally burdensome and more liable to provide a filter with unsatisfactory response. The synthesis methods reviewed in this article are based on prototypes designed to faithfully represent the real components. These prototypes include elements to model the relevant effects of the structure in the particular designs to be carried out. Moreover, accurate EM simulators are used to find an almost exact equivalence between the prototype and the filter parts. Although more elaborate synthesis techniques are usually required, these enhanced prototypes and synthesis procedures can be used to extract outstanding initial structures. The design is essentially solved after the dimensional synthesis of the component since, at most, only a slight and fast final refinement is needed (using an EM optimizer or the tuning elements included in narrowband filters). The examples shown in this article reveal the capabilities of these methods to overcome the limitations of classic circuit synthesis.
    IEEE Microwave Magazine 01/2011; 12(6):87-100. · 1.50 Impact Factor
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    ABSTRACT: This paper presents a synthesis method for low-pass corrugated filters in rectangular waveguide. Using this method, excellent filter dimensions can be obtained in negligible CPU times, even for a demanding set of specifications. In contrast to previous works, low-pass filters with improved power handling capabilities can be successfully synthesized. The procedure is based on a low-pass prototype able to represent the real filtering structure. First, the structure discontinuities are characterized using an electromagnetical simulator, and the retrieved data is included in the prototype model. Then, the resulting prototype is optimized to obtain a suitable ideal response. From the prototype, the structure physical dimensions are synthesized. This paper aims to show the good performance provided by the proposed method and the benefits which can be obtained from its use.
    Microwave Conference (EuMC), 2010 European; 10/2010
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    ABSTRACT: In this paper, a new synthesis and design methodology is presented and applied for the fast and accurate design of inductive rectangular waveguide filters. By using this technique, the dimensions of both homogeneous and inhomogeneous filters can be successfully synthesized for almost any practical filter bandwidth, return loss, or filter order. This novel technique is based on a prototype with additional degrees of freedom, able to match the response of the different filter components in a wideband frequency range, and an elaborated design procedure that fully exploits this flexibility. During the design procedure, the prototype and the real structure are continuously aligned in order to have the same electromagnetic behavior and jointly evolve to obtain an equiripple response. Once the final prototype has been synthesized, excellent filter dimensions can be extracted that, in most cases, do not require further optimization. Examples will show the outstanding performance of the proposed design technique in terms of versatility, accuracy, and CPU time.
    IEEE Transactions on Microwave Theory and Techniques 09/2010; · 2.23 Impact Factor
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    ABSTRACT: In this paper, the trade-offs between out-of-band performance, filter length, power-handling capability, and insertion loss of both symmetrical and asymmetrical evanescent mode ridge rectangular waveguide filters are investigated. As a result, clear design methodologies for optimizing such performances are proposed. The developed methodologies are then applied to design several evanescent mode filters, and a complete performance analysis of the symmetrical and asymmetrical structures is performed. From the performance analysis results, the designer can choose the more appropriate filter topology and design strategy to satisfy the prescribed specifications.
    Radio Science 12/2009; 44(6). · 1.00 Impact Factor
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    ABSTRACT: This paper presents recent advances in the areas of modeling, design, and fabrication of microwave filters for space applications. A fast and accurate hybrid analysis method, combining boundary integral resonant mode expansion (BI-RME) and integral equation (IE) techniques, is described. Several filters used in satellite payloads have been successfully designed, manufactured, and measured. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2007.
    International Journal of RF and Microwave Computer-Aided Engineering 12/2006; 17(1):70 - 76. · 0.75 Impact Factor
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    ABSTRACT: In this paper, a research on the compromises arisen in the design of traditional evanescent mode waveguide filters is carried out. As a result, clear design methodologies for optimizing length, losses, power handling and spurious-free out-of-band response are developed. In addition, an efficient and very accurate modal analysis tool for this kind of structures is presented. Several filters have been designed according to the different strategies proposed, and a prototype has been finally manufactured. Measurements and filter dimensions validate the proposed design procedures
    01/2006;
  • 12/2005: pages 39-47;
  • P. Soto, V.E. Boria
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    ABSTRACT: In this paper, a new and very versatile prototype for the design of both homogeneous and inhomogeneous wideband direct-coupled-cavity filters is presented. The prototype provides a high flexibility to accurately represent the frequency dependence of the real waveguide components that compose the structure. An approximate synthesis procedure is also described. Several application examples are studied, and the results prove the advantages of the new approach over the techniques conventionally used in the design of this type of filters.
    Microwave Symposium Digest, 2004 IEEE MTT-S International; 07/2004
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    ABSTRACT: This paper describes a novel technique for the very efficient and accurate commputation of the coupling integrals of waveguide step discontinuities between arbitrary cross section waveguides. This new technique relies on solving the Integral Equation (IE) that provides the well-known Boundary Integral -- Resonant Mode Expansion (Bi-RME) method by the Nystrom approach, instead of using the traditional Galerkin version of the Method of Moments (MoM), thus providing large savings on computational costs. Comparative benchmarks between the results provided by the new technique and the original BI-RME method are successfully presented.
    Proc SPIE 04/2004;
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    ABSTRACT: This paper deals with the accurate and efficient modal analysis of arbitrarily shaped waveguides whose cross section is defined by a combination of straight, circular, and/or elliptical arcs. A novel technique for considering the presence of circular and/or elliptical segments within the frame of the well-known boundary integral-resonant mode expansion (BI-RME) method is proposed. This new extended BI-RME method will allow a more accurate solution of a wider number of hollow conducting waveguides with arbitrary profiles, which are usually present in most modern passive waveguide components. To show the advantages of this new extended technique, the modal chart of canonical (circular and elliptical) waveguides, as well as of irises with great practical interest (i.e., cross-shaped irises with rounded corners) has been first successfully solved. Next, a computer-aided-design software package based on such a novel modal analysis tool has first been validated with the accurate analysis of a referenced complex dual-mode filter, and then applied to the complete design of a novel twist component for K-band application based on circular and elliptical waveguides. A prototype of this novel device has been manufactured and measured for verification purposes.
    IEEE Transactions on Microwave Theory and Techniques 01/2004; · 2.23 Impact Factor