Which bands Cannot be used for satellite communication?
7. Which of the following bands cannot be used for satellite communication? Explanation: MF is a lower frequency band than Ku, C and X bands and does not lie in the microwave spectrum. Microwaves are used for satellite communication since the lower bands get reflected by the ionosphere.
What technique does DSP use to double the number of channels by using helical antennas?
5. What technique does DSP use to double the number of channels by using helical antennas? Explanation: The digital signal is transmitted from the satellite to the receivers using circular polarization. The DBS satellites have right-hand and left-hand circularly polarized (RHCP and LHCP) helical antennas.
Why are beverage antennas not used as transmitting antenna?
While Beverage antennas have excellent directivity, because they are close to lossy earth they do not produce absolute gain (typically -20 to -10 dBi). The antenna has very low radiation resistance (less than one ohm) and will rarely be utilized for transmitting.
What is a helical antenna used for?
A helical antenna is a specialized antenna that emits and responds to electromagnetic fields with rotating (circular)polarization. These antennas are commonly used at earth-based stations in satellite communications systems. This type of antenna is designed for use with an unbalanced feed line such as coaxial cable.
Which of the following is not the benefit of smart antenna?
Which of the following is not the benefit of smart antenna? Explanation: Probability of collisions is reduced so the inference is also reduced in smart antennas. Thus the Signal to interference (SIR) increases in this. The SNR is also high as the multipath fading is also reduced n diversity type system.
Why are smart antennas required?
Smart Antennas, also known as multiple antennas, adaptive array antennas, and so on is used to increase the efficiency in digital wireless communication systems. It works by taking the advantage of the diversity effect at the transceiver of the wireless system that is the source and the destination.
What is smart antenna system?
A smart antenna is a digital wireless communications antenna system that takes advantage of diversity effect at the source (transmitter), the destination (receiver), or both. In conventional wireless communications, a single antenna is used at the source, and another single antenna is used at the destination.
How smart antenna is different from simple antenna?
A simple antenna works for a simple RF environment. Smart antenna solutions are required as the number of users, interference, and propagation complexity grow. Their smarts reside in their digital signal-processing facilities.
Who makes 5G smart antenna?
Who invented the first antenna?
What are the benefits of smart antenna technology?
Numerous advantages of Smart Antenna System include:
- It improves the wireless system performance.
- It is economic for a large range of potential users.
- It increases in signal quality, capacity as well as the coverage.
- It is now possible to multiple channels in spatial dimension.
Which of the following is the drawback of smart antenna?
A disadvantage of smart antennas is that they are far more complicated than a traditional antennas. This means that faults or problems may be harder to diagnose and more likely to occur.
What is advantage of antenna in communication system?
A transmitting antenna is one, which converts electrical signals into electromagnetic waves and radiates them. • A receiving antenna is one, which converts electromagnetic waves from the received beam into electrical signals. • In two-way communication, the same antenna can be used for both transmission and reception.
How does a smart antenna work?
Smart antennas (also known as adaptive array antennas, multiple antennas and, recently, MIMO) are antenna arrays with smart signal processing algorithms used to identify spatial signal signature such as the direction of arrival (DOA) of the signal, and use it to calculate beam forming vectors, to track and locate the …
How much is Telstra smart antenna?
The Smart Antenna is priced at $720, and you have the option to either purchase outright, or purchase on a $30 monthly payment plan.
Which modulation technique is used as advantage in smart antenna?
As extended Smart Antenna technology, MIMO supports spatial information processing, in the sense that conventional research on Smart Antennas has focused on how to provide a digital beamforming advantage by the use of spatial signal processing in wireless channels.
What is the principle of antenna?
How does an antenna work? The antenna at the transmitter generates the radio wave. A voltage at the desired frequency is applied to the antenna. The voltage across the antenna elements and the current through them create the electric and magnetic waves, respectively.
What happens if you transmit without an antenna?
Yes, transmitting without an antenna can destroy your finals, but due to the high voltage needed to maintain the high current flowing through the pullup inductor, since it can’t flow through the non-existent load. The excessive voltage then causes the FET to go into avalanche.
Is antenna a transducer?
An antenna is a transducer designed to transmit or receive radio waves which are a class of electromagnetic waves. In other words, antennas convert radio frequency electrical currents into electromagnetic waves and vice versa.
What are three types of antenna types?
There are several different types of antennas in three broad categories: omni-directional, directional, and semi-directional. – Omni-directional antennas propagate in all directions. – Semi-directional antennas propagate in a constricted fashion, defined by a specific angle.
What is the smallest antenna?
The ONE mXTEND antenna booster provides global connectivity, while solving the usual challenge of size: it’s only 7.0 mm x 3.0 mm x 1.0 mm — a volume of just 21 mm³.
Which antenna has highest gain?
dBd – “decibels relative to a dipole antenna”. Note that a half-wavelength dipole antenna has a gain of 2.15 dBi. Hence, 7.85 dBd means the peak gain is 7.85 dB higher than a dipole antenna; this is 10 dB higher than an isotropic antenna.
Does antenna shape matter?
Obviously, the waves arriving at an antenna from a transmitter are exactly the same, no matter what shape and size the antenna happens to be. A different pattern of dipoles will help to concentrate the signal so it’s easier to detect.
Can I use a satellite dish as an antenna?
If you have a satellite dish mounted to the roof or the side of your house, it is able to be used as an external television antenna. This will allow you to receive digital broadcast television signals that are available in your area. You will first need to obtain an amplified clip-on antenna to attach to the dish.
What is antenna gain in RF?
Antenna gain indicates how strong a signal an antenna can send or receive in a specified direction. Gain is calculated by comparing the measured power transmitted or received by the antenna in a specific direction to the power transmitted or received by a hypothetical ideal antenna in the same situation.
Is an antenna just a wire?
The small loop antenna is just a ring of wire, and any current in the wire produces a magnetic field surrounding the antenna. The loop antenna generates a magnetic field, and the dipole antenna generates an electric field.