The input impedance of an amplifier is 145 Ohms. The antenna impedance is 20 Ohm. Design a matchi...
The input impedance of an amplifier is 145 Ohms. The antenna impedance is 20 Ohm. Design a matching network with perfect match at 12 MHz. Assuming that the available power from antenna is at the level of -100 dBm in the band 10-15 MHz, calculate the amount of power transferred to the amplifier.
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The input impedance of an amplifier is 145 Ohms. The antenna impedance is 20 Ohm. Design a matchi...
Radio station K5MC has a transmitting antenna with an impedance of 70-j40 ohms at 21.0 MHz. The distance from the transmitter to the antenna is 90 feet. Design a single- stub matching system for a lo...
Radio station K5MC has a transmitting antenna with an impedance of 70-j40 ohms at 21.0 MHz. The distance from the transmitter to the antenna is 90 feet. Design a single- stub matching system for a lossless line of 50 ohms so that the transmitter will be matched to the antenna system. Assume that the velocity of propagation along the line is 0.66c (c 3.108 meters per second). Be sure to give physical dimensions of the matching system 2.
Radio station...
You have an antenna with an input impedance of Z (140 -j35)2 at f 120 MHz....
You have an antenna with an input impedance of Z (140 -j35)2 at f 120 MHz. You would like to match this load to a 70Ω transmission line using a single stub tuner (vp-2.2x108 m/s). Using the Smith chart, determine the distance d away from the load and the length l of a short-circuited parallel stub to accomplish the matching goal at the design frequency. Estimate the reduction in radiated power if the operating frequency is changed to f 125...
A dipole antenna, with a triangular current distribution, is used for communication with sub- marines at...
A dipole antenna, with a triangular current distribution, is used for communication with sub- marines at a frequency of 150 kHz. The overall length of the dipole is 200 m, and its radius is I m. Assume a loss resistance of 2 ohms in of the antenna including the loss resistance. The input reac- tance can be approximated by tan(xl/l) (b) Evaluate the radiation efficiency of the antenna. c) Evaluate the radiation power factor of the antenna. (d) Design a...
1. Consider a source driving the antenna model in the circuit below. The source has a voltage of 100Vrms and an impedance of RS 50 ohs. The antenna has an impedance of Z RRadRLoss+jX where the radiat...
1. Consider a source driving the antenna model in the circuit below. The source has a voltage of 100Vrms and an impedance of RS 50 ohs. The antenna has an impedance of Z RRadRLoss+jX where the radiation resistance RRad-3 ohms, the loss resistance RLoss-12 ohms, and the reactance jXj150 ohms. (a) What is the efficiency of the antenna? (This miserable efficiency is actually better than many electrically-small antennas.) (b) How much power is being radiated? (c) How much power would...
3. (20 points) (a) Design an LC matching network for a load with an impedance of...
3. (20 points) (a) Design an LC matching network for a load with an impedance of 100+ j60 ohm at 2 GHz. (b) Design an LC matching network for a load with an impedance of 20-j20 ohm at 2 GHz. Assume ideal inductors and capacitors, and that you can choose any value you wish. This is not true in real life. oh smith clads
A 3 m feeder has input impedance of 90+j 35 ohm and Z0=20+j 50 is used to connect signal source supplies 15 volts and has impedance 50 ohm, to an antenna of 60+j 40. Obtain: a. Attenuation and phase constant per meter. (10 Marks) b. The current at antenna
A 3 m feeder has input impedance of 90+j 35 ohm and Z0=20+j 50 is used to connect signal source supplies 15 volts and has impedance 50 ohm, to an antenna of 60+j 40. Obtain:a. Attenuation and phase constant per meter. (10 Marks)b. The current at antenna terminal. (3 Marks)c. The current at the middle of the feeder.
You are on an interview with Sungsam LTE and the interviewer shows you their new 2300 MHz cell phone transceiver and antenna printed circuit board (PCB) shown below. "Between the RF source an...
You are on an interview with Sungsam LTE and the interviewer shows you their new 2300 MHz cell phone transceiver and antenna printed circuit board (PCB) shown below. "Between the RF source and antenna is a matching network of small circuit elements (i.e. inductor, capacitor or resistor) - the antenna feedline has a characteristic impedance Zo of 50 Ohms", she exclaims. She goes on to request you show her using her Smith Chart how you would 'match' the PCB trance...
Review | Constants Consider the circuit shown in (Figure 1). Suppose that vg 145 cos 10,000+...
Review | Constants Consider the circuit shown in (Figure 1). Suppose that vg 145 cos 10,000+ V, where t is in seconds. = Part A Determine the load impedance for the circuit that will result in maximum average power being transferred to the load. Figure < 1 of 1 > Express your answer in ohms to three significant figures. Enter your answer in rectangular form. ► View Available Hint(s) 4 mH 2.5 F | ΑΣφ If vec ☺ ? 25...
Design a BJT amplifier based on the specifications provided in the table below. Your design shoul...
THE STEPS TO DO SO:
Design a BJT amplifier based on the specifications provided in the table below. Your design should be insensitive to β variations, and both the input and the output should be AC coupled as in Fig. 1. Supply Voltage, Vcc Load Resistance, RL Transistor's Current Gain, β Relative Variation of lc for VBE-0.7 ± 0.1 V 0-to-Peak Output Swing, Vo Voltage Gain, A Input Resistance, R THD for 5kHz IV (0-to-peak) Sine Wave Output Voltage, V。S5%...
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os,...
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os, is so large it may be neglected. 0) Calculate the open circuit voltage gain Av Yout/ Vis. i) The amplifier has a load of 10 k2. Determine the current gain Va. = 12 V 150k 4k3 Vout Vin 200k GND = 0 V Figure 4b a) State the name...
Radio station K5MC has a transmitting antenna with an impedance of 70-j40 ohms at 21.0 MHz. The distance from the transmitter to the antenna is 90 feet. Design a single- stub matching system for a lossless line of 50 ohms so that the transmitter will be matched to the antenna system. Assume that the velocity of propagation along the line is 0.66c (c 3.108 meters per second). Be sure to give physical dimensions of the matching system 2.
Radio station...
You have an antenna with an input impedance of Z (140 -j35)2 at f 120 MHz. You would like to match this load to a 70Ω transmission line using a single stub tuner (vp-2.2x108 m/s). Using the Smith chart, determine the distance d away from the load and the length l of a short-circuited parallel stub to accomplish the matching goal at the design frequency. Estimate the reduction in radiated power if the operating frequency is changed to f 125...
A dipole antenna, with a triangular current distribution, is used for communication with sub- marines at a frequency of 150 kHz. The overall length of the dipole is 200 m, and its radius is I m. Assume a loss resistance of 2 ohms in of the antenna including the loss resistance. The input reac- tance can be approximated by tan(xl/l) (b) Evaluate the radiation efficiency of the antenna. c) Evaluate the radiation power factor of the antenna. (d) Design a...
1. Consider a source driving the antenna model in the circuit below. The source has a voltage of 100Vrms and an impedance of RS 50 ohs. The antenna has an impedance of Z RRadRLoss+jX where the radiation resistance RRad-3 ohms, the loss resistance RLoss-12 ohms, and the reactance jXj150 ohms. (a) What is the efficiency of the antenna? (This miserable efficiency is actually better than many electrically-small antennas.) (b) How much power is being radiated? (c) How much power would...
3. (20 points) (a) Design an LC matching network for a load with an impedance of 100+ j60 ohm at 2 GHz. (b) Design an LC matching network for a load with an impedance of 20-j20 ohm at 2 GHz. Assume ideal inductors and capacitors, and that you can choose any value you wish. This is not true in real life. oh smith clads
You are on an interview with Sungsam LTE and the interviewer shows you their new 2300 MHz cell phone transceiver and antenna printed circuit board (PCB) shown below. "Between the RF source and antenna is a matching network of small circuit elements (i.e. inductor, capacitor or resistor) - the antenna feedline has a characteristic impedance Zo of 50 Ohms", she exclaims. She goes on to request you show her using her Smith Chart how you would 'match' the PCB trance...
Review | Constants Consider the circuit shown in (Figure 1). Suppose that vg 145 cos 10,000+ V, where t is in seconds. = Part A Determine the load impedance for the circuit that will result in maximum average power being transferred to the load. Figure < 1 of 1 > Express your answer in ohms to three significant figures. Enter your answer in rectangular form. ► View Available Hint(s) 4 mH 2.5 F | ΑΣφ If vec ☺ ? 25...
THE STEPS TO DO SO:
Design a BJT amplifier based on the specifications provided in the table below. Your design should be insensitive to β variations, and both the input and the output should be AC coupled as in Fig. 1. Supply Voltage, Vcc Load Resistance, RL Transistor's Current Gain, β Relative Variation of lc for VBE-0.7 ± 0.1 V 0-to-Peak Output Swing, Vo Voltage Gain, A Input Resistance, R THD for 5kHz IV (0-to-peak) Sine Wave Output Voltage, V。S5%...
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os, is so large it may be neglected. 0) Calculate the open circuit voltage gain Av Yout/ Vis. i) The amplifier has a load of 10 k2. Determine the current gain Va. = 12 V 150k 4k3 Vout Vin 200k GND = 0 V Figure 4b a) State the name...
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