2. How would you characterize the input impedance of an electrically small loop antenna relative to...
2. How would you characterize the input impedance of an
electrically small loop antenna relative to a 50' transmission
line:
a. Low input resistance and capacitive reactance.
b. High radiation resistance and capacitive reactance.
c. Low radiation resistance and inductive reactance.
d. High resistance and inductance reactance.
Homework Answers
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2. How would you characterize the input impedance of an
electrically small loop antenna relative to...
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...
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...
Please answer the following questions and show work. Thank you. 1. true or false. the heavier...
Please answer the following questions and show work. Thank you. 1. true or false. the heavier the current flow for a given voltage, the larger the value for admittance. 2. what is the reactance of a 25 millihenry coil at 600 hertz? a) 94,000 ohms b) 0.011 ohms c) 785 ohms d)94 ohms 3. In a series R-C circuit, at low frequencies, the total reactance of the capacitor will be high ad the total impedance will be capacitive in nature,...
2. Find the reflection coefficient, SWR, and the input impedance at the distance & from the...
2. Find the reflection coefficient, SWR, and the input impedance at the distance & from the end of the line for the transmission line with characteristic impedance Zo and the load impedances: (a) capacitance C (b) inductance L (c) impedance ZĻ = Zo (d) another transmission line with characteristic impedance Ž (e) open circuit (R = ) (f) short circuit (R = 0)
4. An AM radio antenna has 3000 loops with diameter 0.20 m; a radio station makes...
4. An AM radio antenna has 3000 loops with diameter 0.20 m; a radio station makes its 2 nt magnetic field oscillate at 1400 kHz pointing left, then right. a) which coil orientation is best for the antenna's reception? { ABC} b) calculate the voltage from the antenna Rho 5. We might power a Crooke's tube using a Tesla coil transformer with 20 turns on the primary; 10,000 turns on the secondary, using 2.0 A from a 6 VAC 60...
Please help especially with the excel part. Thank you 2. A series RLC circuit has 3mH...
Please help especially with the excel part. Thank you
2. A series RLC circuit has 3mH of inductance, 75.612 of resistance, and 84.4nF of capacitance. A 12v ac source is used. a. Determine the resonant frequency, bandwidth, and high & low cutoff frequencies of the circuit, all in kHz. b. Use the Excel spreadsheet posted to create a table and calculate the following over a range of 2kHz to 20kHz, at every 1kHz: • Capacitive Reactance • Inductive Reactance •...
Can you show me how to do this step by step? Please write legible. 35. Suppose...
Can you show me how to do this step by step? Please write
legible.
35. Suppose an antenna has a radiation resistance of 35 12 and its feed line has a characteristic impedance of 50 2. What is the efficiency of the antenna? (a) 15 percent (b) 41 percent (c) 59 percent (d) 70 percent (e) Impossible to calculate from this information
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...
Nonideal Capacitor Impedance No electronic component is perfect. All capacitors have small imperfections called "parasitics", that...
Nonideal Capacitor Impedance No electronic component is perfect. All capacitors have small imperfections called "parasitics", that deviate from an ideal capacitor's behavior. A model of a realistic capacitor for automotive switching applications is shown below. It is rated for 250 volts. REAL ESR 3m0 logs and electrolyte) ESL 9nH (leg wires) IDEAL R76 MKP H7 Leakage 500MC C1 :11.2nF C1 =11.2nF a) At rated voltage, at DC, what current does the ideal capacitor draw? What current does the real capacitor...
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...
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...
2. Find the reflection coefficient, SWR, and the input impedance at the distance & from the end of the line for the transmission line with characteristic impedance Zo and the load impedances: (a) capacitance C (b) inductance L (c) impedance ZĻ = Zo (d) another transmission line with characteristic impedance Ž (e) open circuit (R = ) (f) short circuit (R = 0)
4. An AM radio antenna has 3000 loops with diameter 0.20 m; a radio station makes its 2 nt magnetic field oscillate at 1400 kHz pointing left, then right. a) which coil orientation is best for the antenna's reception? { ABC} b) calculate the voltage from the antenna Rho 5. We might power a Crooke's tube using a Tesla coil transformer with 20 turns on the primary; 10,000 turns on the secondary, using 2.0 A from a 6 VAC 60...
Please help especially with the excel part. Thank you
2. A series RLC circuit has 3mH of inductance, 75.612 of resistance, and 84.4nF of capacitance. A 12v ac source is used. a. Determine the resonant frequency, bandwidth, and high & low cutoff frequencies of the circuit, all in kHz. b. Use the Excel spreadsheet posted to create a table and calculate the following over a range of 2kHz to 20kHz, at every 1kHz: • Capacitive Reactance • Inductive Reactance •...
Can you show me how to do this step by step? Please write
legible.
35. Suppose an antenna has a radiation resistance of 35 12 and its feed line has a characteristic impedance of 50 2. What is the efficiency of the antenna? (a) 15 percent (b) 41 percent (c) 59 percent (d) 70 percent (e) Impossible to calculate from this information
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...
Nonideal Capacitor Impedance No electronic component is perfect. All capacitors have small imperfections called "parasitics", that deviate from an ideal capacitor's behavior. A model of a realistic capacitor for automotive switching applications is shown below. It is rated for 250 volts. REAL ESR 3m0 logs and electrolyte) ESL 9nH (leg wires) IDEAL R76 MKP H7 Leakage 500MC C1 :11.2nF C1 =11.2nF a) At rated voltage, at DC, what current does the ideal capacitor draw? What current does the real capacitor...
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