Gannon University ECE 335 EM Fields Fall 2015 Dr. Ram Sundaram FINAL PROJECT: OPTIONS Due: Friday, December 18, 2015, 12:00 pm 1. Work in teams of at most four members. 2. Choose one of the options described here. 3. Propose a design and implementation strategy for the chosen option. 4. Simulate and validate your design. 5. Write the report (one per team) documenting the design, implementation, simulation, and validation processes. The general guidelines are as follows: Submit the Final Project report (hard copy only) as follows: 1. The report as a printed word document 2. The program (i.e. code/model/VI) written and used for the implementation in . (maximum page count = 10) the Appendix. (maximum page count = 5) The report must contain evidence in the following categories. • Project title & participants (names of all team members) • Summary of design process(up to 200 words) • Block diagram of the design • Implementation of the design • Simulation/Test and Validation of the design • Discussion and conclusions Gannon University ECE 335 EM Fields Fall 2015 Dr. Ram Sundaram Option 1 THEME: Transmission line design DESIGN PROBLEM: (a) Design the single shunt open stub matching network for ZL = 15 + j10 Ω to be matched to the Zo = 50 Ω transmission line. (b) Design the single series open stub matching network for ZL = 100 + j80 Ω to be matched to the Zo = 50 Ω transmission line. Gannon University ECE 335 EM Fields Fall 2015 Dr. Ram Sundaram Option 2 THEME: Waveguide design DESIGN PROBLEM: The copper-plated waveguide (σc = 5.8 x 10 7 S/m) which operates at the frequency of F GHz must deliver 1.2 kW of power to the antenna. The guide is filled with polystyrene (σ = 10-17 S/m, ε = 2.55ε0 ) and has dimensions specified by (a, b, c) where a represents the width, b the height, and c the length. The guide operates in the TE10 mode. Determine the power dissipated in the guide for each of the following cases. Identify the cases that will meet the power requirements of the antenna. Table: Waveguide specifications Frequency, F (GHz) a, cm b, cm c, cm 1.2 4.0 2.0 30 2.4 4.0 2.2 30 3.6 4.1 2.4 45 4.8 4.2 2.6 60 5.6 4.4 2.8 60 Gannon University ECE 335 EM Fields Fall 2015 Dr. Ram Sundaram Option 3 THEME: Antenna design DESIGN PROBLEM: (a) For a pair of half-wavelength (λ/2) dipole antennas (one as transmitter and the other as receiver, each with 100% efficiency assumed) as shown in Figure 1, complete the table shown below and determine the orientation (i.e. angle θ) for maximum power transfer. Figure 1: Table: Transmitter-receiver antenna specifications Pin, kW Frequency, F R, km θ, degrees Pout/Pin(dB) Pout 1.0 1.0 GHz 1 0 1.0 1.0 GHz 1 30 1.0 1.0 GHz 1 45 1.0 1.0 GHz 1 60 1.0 1.0 GHz 1 90 (b) For linear polarized waves, maximum power transfer occurs when the electric fields for the transmitting and receiving antennas have the same polarization. Polarization efficiency, ep is defined as 2 p Et Er e = a ⋅a . The maximum transmission occurs when the polarization vectors are in the same direction i.e. Et Er a = a . Et a θ R Pin Prad Pout Prec For the same set-up of two half-wavelength (λ/2) dipole antennas complete the table described above and determine the orientation for maximum power transfer.