• The power amplifier of a portable cellular handset operates at 3.2 volts and has an output power of 600 mW. Find the amplifier output impedance.
• The amplifier is connected to the handset antenna which has an impedance of 35 + j10 ? at one unspecified operating frequency. Find the inductive reactance and capacitive reactance needed to match the transmitter output to the antenna under this condition. (Hint: you can use the amplifier output impedance as Z0. Use the method of Pozar example 2.5 or any other means to find the matching
network).
• If the handset is operating at 1800 MHz, find the capacitance and inductance of the matching network.
• To put these impedances into perspective, research how one can calculate the impedance of a straight piece of wire or printed circuit board (PCB) conductor in terms of length, thickness and width. Find the length of the conductor on a PCB that would provide the desired impedance. Note: it is common to specify PCB material by weight. A "1 ounce copper" circuit board has a thickness of copper that weighs one ounce per square foot. Circuit trace width can vary widely, but you may assume a 25 mil trace width.