Radio Frequency (RF) transmission characteristics or Radio Frequency by definition is known as a frequency in the range within which radio waves may be transmitted‚ from about 3 kilohertz to about 300‚000 Gigahertz. RF is also the range of oscillation that ranges from 3 KHz to 300 GHz and work hand in hand with the frequency of the radio waves and the fluctuation currents that carry radio signals. Radio Frequency has different types of properties but ones that are most important are the radiation
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coefficient‚ isolation coefficient and directivity of the directional coupler are calculated and recorded in Table 3. Results: Frequency‚ GHz | 1.4 | 1.5 | 1.6 | 1.7 | 1.8 | 1.9 | 2.0 | Voltage‚ Vtune | 1.4 | 2.3 | 3.6 | 4.9 | 6.1 | 7.4 | 8.4 | P1 (Input Power)‚ dBm | 0.48 | 5.63 | 6.55 | 6.00 | 5.80 | 5.47 | 5.97 | Table 1: Input power to directional coupler Frequency [GHz] | P2 | P3 | P4 | | Output Voltage [mV] | Output Power [dBm] | Output Voltage [mV] | Output Power [dBm] | Output
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Ball | Height of rebound | Coefficent | Golf Ball-Floorboards | 50cm | 0.50 | Baseball-Floorboards | 20cm | 0.20 | Netball-Floorboards | 80cm | 0.80 | Basketball-Floorboards | 85cm | 0.85 | Volleyball-Floorboards | 85cm | 0.85 | Baseball-Turf | 25cm | 0.25 | Soccer Ball-Turf | 75cm | 0.75 | Basketball-Turf | 85cm | 0.85 | Golf Ball-Turf | 5cm | 0.05 | Basketball-Carpet | 70cm | 0.70 | Netball-Carpet | 75cm | 0.75 | Baseball-Carpet | 25cm | 0.25 | Golf Ball-Carpet | 20cm
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= 3. a_1 = 2.3 y = a_1*np.sin(2.*np.pi*time*f_1) plt.plot(time‚y) plt.xlabel("Time t [s]") plt.ylabel("Wave") plt.title("Wave Signal") plt.show() n = time.shape[-1] transform = (fft(y)[:n/2]) * 2./n frequency = fftfreq(n‚time[1]-time[0])[:n/2] plt.plot(frequency‚np.abs(transform)) plt.xlabel("Frequency f [Hz]") plt.ylabel("Amplitude") plt.title("Fourier Transform") Input: Output: (code): import numpy as np import matplotlib.pyplot as plt from scipy.fftpack import fft‚fftfreq
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the oscillating up and down the length of the source (antenna). The current is this created in the antenna. •Adjust the transmitter on the simulator so that it is in the sinusoidal mode and the electrons are oscillating up and down at a regular frequency. Ensure the “display the curve” and the “radiated field” boxes are checked. What does the
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producing sounds of different frequencies which were used to vibrate a mirror. A beam of light was then reflected from the mirror to produce trace patterns which were dependent on the frequencies. This setup used by Lissajous is similar to what is used today to project laser light shows. Today‚ Lissajous figures are generated with an oscilloscope‚ a type of cathode ray tube that provides a picture of electric signals in the form of a graph. Before digital frequency meters and phase-locked loops
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Vibration Sensors Introduction / Selection Characteristic Flat Frequency Response 20–1‚500 Hz 2–5‚000 Hz Phase Fidelity 2–5‚000Hz Reduced Noise at Higher Frequencies Linearity Mounting in Any Orientation Temperature Limitation EMI* Resistance Mechanical Durability Coil and Magnet Velocity Sensor Piezoelectric Velocity Sensor Yes No Yes Yes Acceptable Excellent No Good Sensor Dependent > +707°F (+375°C) Acceptable Good Yes Good Yes +248°F (+120°C)
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microprocessors to generate a clock at high frequency (Fout=2GHz for example) from an external clock at low frequency (Fref = 100MHz for example). The PLL is also used as a clock recovery circuit to generate a clock signal from a series of bits transmitted in serial without synchronization clock (Figure below). The PLL may also be found in frequency demodulation circuits‚ to transform a frequency varying waveform into a voltage. The PLL uses a high frequency oscillator with varying speed‚ a counter
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and ‘1’ are represented the shifting value between the two selected amplitude. 2) Frequency Shift Keying (FSK) FSK is a modulation technique that related with the frequency shifting or changes of carrier signal to transmit the digital information. In simple cases of FSK modulation‚ one of the two frequencies transmits the digital data which is one of the frequencies will transmit ‘0’ while the other frequency transmits ‘1’. There are several types of FSK modulation that
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the design of a dual-frequency antenna for GSM and UMTS/LAN/ISM system applications. A patch antenna with rectangular aperture is designed by using a thick substrate in order to increase the bandwidth. After this‚ we have extracted the reflection coefficient of the considered antenna excited by a probe feed and by optimizing the antenna dimensions and the aperture position. The simulation of this antenna has been made by advanced design system (ADS) in the band of frequency between 50 Hz and 3.2
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