Electronics Projects by Ramesh Chopra

By Ramesh Chopra

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We will now list the loss formulas that will be found useful and the effects associated with the dielectric and metal strip can be treated individually. 1 Dielectric loss Typical dielectric substrate material creates a very small power loss at microwave frequencies. The calculation of dielectric loss in a dielectric filled transmission line is easily carried out provided exact expressions for the wave mechanism are available but for microstrip this involves extensive mathematical series and numerical methods.

F tg. 1 Sectional sketch o f microstrip line Unless specified, the substrate relative permeability y^. will be taken as unity, and in most cases of practical interest the finite strip thickness can be neglected. A reader requiring a detailed discussion of the physical action should consult one of the numerous treatments referenced in Gunston (1972) or Hammerstad and Bekkadal (1975). For design purposes, we require a knowledge of the wavelength Xm of the wave guided in the microstrip and also the characteristic impedance Z m of the line.

MTT-20, pp. 760762 Chapter 2 Microstrip design equations and data It is well known among antenna designers that the performance obtained from a slotted waveguide travelling-wave array is very dependent on the precision with which the waveguide itself is designed and manufactured. If a parallel feeding method is used the design is, of course, less critical, but then cost, size and weight factors are adversely affected. It is apparent from Chapter 1 that the accuracy to which the aperature distribution of all the flat-plate antennas can be designed is also dictated by the design of their respective transmission-line structures.

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