1. Telecommunications JBCardenas © 1982 Com3 4Q1516 Antenna Design JBC © 198 v A2,2 Key design requirements 1.Undertake the theoretical computations of shapes and geometries with matching and clear preferably scaled illustrations 2.Provide the wire geometries input to NEC for all configurations in table form; make sure intersections terminates exactly 3.You may have to configure curves and sheets with short sections of linear wire, compute the metric diameter of the 8AWG wire (alternative 10AWG) 4.A wire section should have at least 5 segments 5.Package report concisely, e.g. side by side comparisons of 3D and 2D plots, with 3 D antenna geometry, indicate gain F/B ratio and beam width for each pattern rather than one pattern per page 6.In addition to the profiles, make sure to include the wire diagrams and orient all diagrams so that it is clearly perceived by the reader, if necessary use more than one illustration for a particular configuration 7.Simulation is easy, the difficult part is the math of steps 1 and 2. Remember garbage in garbage out. 8.Hard copy final report, see separate PDF file for details 9.Soft copy to include all input data for the simulator, a user guide (notepad) if it will fit CD, an installation package. 10.X-axis propagation axis, Y-axis horizontal parallel to dipole elements, Z-axis vertical, center or origin at signal source.

2. Telecommunications JBCardenas © 1982 Com3 4Q1516 Antenna Design JBC © 198 v A2,2 Design objective (simulation using NEC) Design an antenna for 479Mhz digital signal reception. Alternately for DTV GMA or ABS, with prototype TV+ for testing. Optimize for gain. Use AWG10 solid bare copper wire as wire element. All groups to use the same power setting, etc… Parasitic directors of same lengths and 0.1 wavelength spacing, perfect ground Design results Radiation profiles 2D V/H 3D, antenna schematic, gain, beamwidth impedance Sensitivity analysis: when optimum is found use the same settings Check performance at +/- 10%, 20% of frequency Comparative analysis: Using optimum result use the same settings Compare vs reference antenna of similar dimensions Prototype fabrication and testing: optional; use 10AWG and no metallic materials for boom, glue and support structures.

3. Telecommunications JBCardenas © 1982 4Q1516 model 1 JBC © 198 v A2,2 Driven half wavelength dipole at the focus of a parabolic reflector Parabolic reflector is a section of a full parabola, comprised of at least 3 parabolic wire elements, and 3 circular (or hexagonal) wire elements. The diameter of the mouth of the parabola 105% of driven dipole; other circles (or hexagons) diameters 100% 95% of dipole length The driven dipole should be in the plane of the mouth of the reflector Try to make the focal length as near as 0.1 wavelengths as possible Provide four 95% parasitic director 0.1 wavelengths away from driven dipole and each other Optional: vary the 0.1 director distances +/- 0.05 to get best gain Reference antenna: Yagi of similar dimensions

4. Telecommunications JBCardenas © 1982 4Q1516 model 2 JBC © 198 v A2,2 Driven half wavelength dipole at the focus of a parabolic reflector Reflector is a section of a cylindrical parabola, at least 5 equally spaced parabolic elements; at least 6 horizontal elements to comprise the mesh. The diameter of the mouth of the parabola and the width of the cylinder 105% of length of dipole Horizontal elements 105%, 100% and 95% half wavelength apart in pairs The driven dipole should be in the plane of the mouth of the reflector Try to make the focal length as near as 0.1 wavelength as possible Provide 4 95% parasitic director spaced 0.1 wavelengths Optional: vary the 0.1 director distances +/- 0.05 to get best gain Reference antennas: Yagi of similar dimensions but linear dipole elements 100% 105%

5. Telecommunications JBCardenas © 1982 4Q1516 model 3 Driven dipole 0.1 wavelength from center of 90 degrees corner reflector Corner reflector comprised of at least 5 equally spaced vertical and 7 horizontal wire elements to comprise the mesh The width and height of the mouth of the reflector 105% of dipole The driven dipole should be in the plane of the mouth of the reflector Horizontal elements 105%, 100% and 95% half wavelength apart in pairs Provide four 95% parasitic directors spaced 0.1 wavelengths Optional (A): vary the angle of the reflector (height) to get best gain start at 90 degrees, then +/- 5 degrees. Optional (B): vary the 0.1 director distances +/- 0.05 to get best gain Reference antenna Yagi same distances but linear elements 50%

6. Telecommunications JBCardenas © 1982 4Q1516 model 4 JBC © 198 v A2,2 Driven dipole 0.1 wavelength from quad reflector Quad reflector comprised of at 3 quad elements electrically isolated from each other with a corner connection The sides of the quads = 105%, 100% and 95% of dipole Provide 4 95% parasitic directors spaced 0.1 wavelengths Optimization 1: vary the 0.1 reflector distance +/- 0.05 for best gain Optimization 2: then vary the 0.1 director distances +/- 0.05 for best gain When best is found move the corner connection to vertical repeat Repeat simulation again without the corner (now vertical) connector Reference antenna: Yagi, dipole reflector instead of quad 100%

7. Telecommunications JBCardenas © 1982 4Q1516 model 5 This design is disc-cone using wire mesh, hence all wire elements are driven or there are no parasitic elements. Ensure electrical connectivity. Disc, center conductor of co-ax, comprise of 3 circles (or hexagons) with diameters of 35% 17.5% and 8.75% of half wavelength dipole Cone, outer conductor of co-ax, 4 circular (or hexagonal) elements and 6 vertical elements in the same plane as straight elements of disk. Cone length and mouth diameter quarter wavelength; circle diameters are 100% 70% 35% and 17.5% of quarter wavelength, hence 3 are similar in sizes to circles (or hexagons) of disc Insulation distance of cone from disc, at 0.1 wavelength. Optionally vary insulation distance +/- 0.5 for maximum gain. Reference antenna: Vertical resonant monopole