iii. of the antenna compare with the wavelength? (Hint: use the circuit diagram depicted in Figure 5 (dimensions in mm) to approximately evaluate the electric length of the antenna circuit.) Explain The RF circuit and the antenna are connected through a transmission line printed in the circuit board. What is the approximate impedance of the transmission line using the dimensions of the transmission line shown in Figure 5 below? a) The approximate value is 500 b) The approximate value is 750 c) The approximate value is 900 d) The approximate value is 1200 e) None of the above iv. The arrows in Figure 4 indicate the direction of maximum radiation power. Based on the antenna layout, can you justify this pattern with simple concepts?/n3. Figures 4 and 5 depict a receiver board from Silicon Lab: In the schematic different parts of the circuit can be distinguished. • The RF circuit and matching network . A printed balun that plays the role to equalize the signals in both branches of the antenna. ⚫ The antenna built in the multi plane PCB with vias that generates the 3D structure shown in the lower scheme. ⚫ A PCB transmission line that connects the RF circuit with the antenna. Top Layer Main Radiation Deson PCB Antenna (DFA) Main Radiator Differential strip Single ended input SMA Connector Keep Perted Balun EBO -Batching network -RFIC Crystal Bottom Layer וניי Figure 4. Receiver board from Silicon Lab With this information in Figure 4, answer the following questions: i. ii. What is the function of the matching network? (Hint: Think in terms of circuit theory, assuming that the antenna is the load to the RF circuit) Assume that the PCB material has a relative permittivity of 4.2 and a thickness of 1mm. The circuit operates at 315 MHz. How do the dimensions

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iii of the antenna compare with the wavelength hint use the circuit di

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iii. of the antenna compare with the wavelength? (Hint: use the circuit diagram depicted in Figure 5 (dimensions in mm) to approximately evaluate the electric length of the antenna circuit.) Explain The RF circuit and the antenna are connected through a transmission line printed in the circuit board. What is the approx