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PROCEDURE NUMBER DESIGN PROCEDURE DESCRIPTION NOTE – COMMENT – REFERENCE 7. Use either inset feed or quarter-wavelength transmission line for impedance matching to the desired input impedance Equation 6 or Equation 7. A coaxial probe beneath the substrate with center conductor extending to the inset feed point may also be appropriate on occasion. 8. Calculate the directivity Equation 12 9. Calculate the radiation patterns Equation 9 and Equation 10 10. Simulate antenna design using an EM simulator and compare results EM simulation tools have provided accurate performance predictions and in many cases have expedited the design cycle time by limiting the prototype fabrication stage to a single iteration. 11. Fabricate antenna and compare measured results with design and simulation MICROSTRIP ANTENNA DESIGN EXAMPLE To summarize the rectangular microstrip antenna tutorial content at this point: Operational parameters and principles have been established Design parameters and equations have been presented and references identified Design procedure has been outlined To further explore the rectangular microstrip antenna, a design example is documented in Table 4 using the procedure of Table III. The example illustrates the design procedure for a 5.8 GHz, direct coupled microstrip antenna on 0.062-inch-thick Rexolite® substrate. Rexolite is a dimensionally stable, cross-linked polystyrene plastic with a frequency independent dielectric constant of 2.55 and low loss tangent; typically less than 0.001 to 100 GHz. 15 TABLE 4: MICROSTRIP ANTENNA DESIGN EXAMPLE DESIGN PARAMETER SYMBOL DESIGN VALUE NOTE – COMMENT Center Frequency f o 5.8 GHz Operational frequency Dielectric Constant e r 2.55 Specified parameter Substrate Height h 1.575 mm (0.062 in) Specified parameter Conductor width W 19.41 mm (0.764 in) Equation 13 Effective dielectric constant e eff 2.327 Equation 1 15 Additional information and characteristics of Rexolite may be found at www.rexolite.com. Microstrip Antenna Design 10 www.cadence.com/go/awr