Thus a scattering parameter approach is used in the array analysis. In the first, the feed network will be influenced by the radiating elements in terms of element impedance and inter element coupling.
#Microstrip antenna theory and appliction s. s. zhang series#
In addition, the feed types are generally corporate and series type, respectively. These examples represent the classes of array that have the feed network, respectively, behind and coplanar with the array and represent considerably different challenges to the designer. In order to discuss analysis and design techniques for linear arrays, two examples are taken, namely the disc array fed through the substrate by a feed network mounted behind the ground plane, and the combline array, an example of an integral feed array structure. For this, it is convenient to split the field into arrays of resonators, arrays formed by discontinuities in a continuous line and higher-order mode arrays. In this chapter, after reviewing the forms of feeding arrangements for linear arrays, the practical forms of microstrip linear arrays that have been reported are surveyed. This element is of particular interest because it is amenable to analysis and enables a clearer understanding of the physical aspects of other more complicated discontinuities to be obtained. In this present chapter, attention will be confined to the behaviour of an open-circuit microstrip termination. Very recently there has been an upsurge of interest in the analysis of various forms of microstrip antennas and these will be described in later chapters. Lewin (1960) was perhaps the first to consider the analysis of radiation from microstrip discontinuities, although microstrip antenna arrays comprised of step discontinuities had already been reported several years previous by Gutton and Baissinot (1955). Radiation is, of course, a highly undesirable effect in microstrip circuits and the priority in this respect has clearly been to avoid radiation rather than investigate its origin and behaviour.
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It was concluded in the previous chapter that little had been established in the literature, either by measurement or analysis, about the precise radiation mechanism of discontinuities in microstrip. Radiation mechanism of an open-circuit microstrip termination - fundamental design implications Sometimes the antennas are referred to as printed antennas because of the manufacturing process. The upper surface of the dielectric substrate supports the printed conducting strip which is suitably con toured while the entire lower surface of the substrate is backed by the conducting ground plate. The antenna assembly is physically very simple and flat which are two of the reasons for the great interest in this new antenna topic. The idea of using microstrip to construct antennas is a much more recent development and an example of a microstrip antenna is given in Fig. Readers not completely familiar with the microstrip concept are referred to Chapter 2 for some explanatory details and references. Microstrip is the name given to a type of open waveguiding structure that is now commonly used in present-day electronics, not only as a transmission line but for circuit components such as filters, couplers, resonators etc.
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Flat-plate antenna techniques and constraints on performance