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The concept is, greater the frequency less will be the size of antenna and weight. For example the Mobile Phone uses the half wave dipoles antenna. There is no exact formula for calculating these antennas. The problem is that there are several factors that affect the antenna. Fortunately there is a starting formula for these types of antennas. For center fed, wire dipole antennas, the formula is length of antenna = 468/freq (MHz). Mobile phone in GSM working on the frequencies 900 MHz and 1800 MHz so put the values in the formula you get your answer. If you move further in the frequency band the size will be more small.
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Why low pass filters are required in demodulation process?
Demodulation takes place to extract the low-frequency signal from the high-frequency carrier, using a nonlinear process that produces components at the signal frequency. The LP filter is used to eliminate the high-frequency carrier component from the signal so that it does not cause problems at a later stage in the amplification of the signal.
What is baritt diode?
It is a barrier-injection transit-time, a high frequency - semi - structural element of micro-electronics, as the diode is one of the electronic components.
How do you convert low frequency to high frequency with a circuit?
You typically create a DC power supply from the low frequency, and use that to run a high frequency oscillator and amplifier. If there needs to be a relationship between frequency in and frequency out, often there is a divider running on the high frequency side in combination with a phase locked loop synching up to the low frequency side.
What is the function of a filter capacitor?
This seems like a question from an electrical course, and is probably best answered by your course materials. It's your test question, not ours, and there won't always be someone to ask the answer of. Earn your diploma.
What is a high end frequency scanner?
A: It is a terminology to imply that the scanner will be used at the hi end of frequency as opposed to low frequency
What is convolution of a signal?
the convolution of a signal is to filter the components of the signal. The convolution does not mean the masking. Masking means it is going to remove all the masked components(both high and low frequency components).But convolution is going to remove any one (either low r high frequency) depending upon the filter response.
Give the difference between LPF and HPF?
LPF is a low pass LTI filter which passes the low frequency signals and reduce the amplitude of the signals with frequencies higher than the cutoff frequency. HPF is high pass LTI filter which passes the high frequencies and reduce the amplitude of the frequencies lower than filter's cutoff frequency.
How would your weight be affected if you climb to the top of Mt. Everest?
your weight will reduce as you go into high altitudes
What are the characteristics of air pressure?
Frequency, pitch, and amplitude Frequency is the number of waves that pass at a given time Pitch---long waves have low frequency=low pitch; short waves have high frequency=high pitch Amplitude is the strength of the waves
Am demodulator diode detector circuit?
demodulator circuit is a circuit which is used for remove all high frequency components from modulated signal.
Why low pass filters are required in demodulation process?
Demodulation takes place to extract the low-frequency signal from the high-frequency carrier, using a nonlinear process that produces components at the signal frequency. The LP filter is used to eliminate the high-frequency carrier component from the signal so that it does not cause problems at a later stage in the amplification of the signal.
Why RC oscillators are not suitable for high frequency generation?
Because an RC oscillator is affected by stray capacitance in the active components in the circuit. HF oscillators use an LC tuned circuit to define the frequency.
What is the function of filter in circuit?
Filters are circuits consisting of resistors and capacitors (RC) or inductors and capacitors(LC) to filter unwanted signal components like noise,frequency,etc. Filters can be classified into many types based on different categories. Based on frequency filtering: 1. Low pass(to allow low frequency components) 2.High pass(to allow high frequency components) 3.Band stop or notch (to reject a particular band of frequencies) 4.Band pass(to allow the particular band of frequencies) 5.All pass(to allow all the frequencies)
What does the U stand for in UHF?
Ultra high frequency.
What are the three components of electromagnetic waves that are used to describe them?
from high frequency to low you have: gamma, x-rays, ultraviolet, visible light, infrared, microwaves, radio waves
What frequency does high energy electromagnetic have?
High energy is high frequency.
What is image frequency?
Frequencies of an image: roughly speaking they are a measure of the amount by which the gray value changes with the distance. High frequency components are characterized by large changes in gray values over small distances. e.g. edges, noise. Low frequency components are characterized by little changes in gray values over small distances. e.g. backgrounds, skin texture.
