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Extra resources for Microstrip Antenna Theory and Design
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.