Wire and Wireless Module 2

44問 • 2年前

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Frequency starting from is known as extremely low frequency or ELF range in electromagnetic spectrum.

3Hz to 30 Hz

This range is highly vulnerable to disturbance and easily gets distorted by atmospheric changes. It is hard to design a system in this rage is challenging because of the larger wavelengths required long antennas which are practically impossible to achieve. Scientists use this frequency band in seismic studies to understand natural activities in earth’s atmosphere.

Extremely Low Frequency

Very low frequency is the starting range of RF and practical radio transmission system which span from ____________

3 KHz to 30 KHz.

design and implementation of the antenna system is extremely complicated due to the wavelength. It has been using in submarines and still used in time radio station which synchronizes clock signals between two remote locations.

Very Low Frequency

Low frequency is in the range of _________

30 KHz to 300 KHz.

One of the important properties of LF signals is that it will get reflected by earth’s ___________ and thus it is suitable for long distance communication. Since it’s long wavelength and less attenuation from big terrains like mountains, it is generally called _______________

ionosphere ground waves

are used by amateur radio operators; it is one of the most important sources of information transfer when other kind of communication sources fails during some situation like natural disasters. Other areas are military applications like submarines, RFID tags in near field communication and some low frequency radio broadcasting.

Low Frequency

_____________ was one of the most popular frequency bands since the beginning of wireless radio transmission in the early nineteenth century. Operates in the range of _____________

Medium frequency 300 KHz to 3 MHz.

Design of transmitters, receivers and antenna are relatively less complex than other high frequency transmission bands. Has been widely used in AM radio transmission, navigation systems for ships and aircraft, emergency distress signals, cost guards and other experimental applications.

Medium Frequency

High frequency signals ranges between ___________. This frequency band is also known as ___________.

3 MHz and 30 Mhz. short wave

It also gets reflected by earth’s ionosphere and it is one of the suitable band for long distance communication. Mostly used by aviation industry, near field communication (NFC), government systems, amateur radio operators and weather broadcasting stations.

High Frequency band

Is one of the most commonly used bands which has an operating range from __________.

Very High Frequency 30 MHz to 300 MHz

Is widely used in analog TV broadcasting since it has started few decades back. FM radio broadcasting at ______________ operates in VHF frequency band. Air traffic controllers and airline pilots using frequency between ___________ to communicate.

Very High Frequency 88 MHz to 108 MHz 118 MHz to 137 MHz

Another uses includes private and business radio station, medical equipment (magnetic resonance imaging), amateur radio and military applications. It usually affected by big terrains but suitable for short distance communication.

Very High Frequency

is the most important frequency bands for modern wireless communication systems. It begins from ___________ and extremely complicated to design and implement the system.

Ultra high frequency 300 MHz to 3 GHz

It is used in GPS navigation systems, satellites, pagers, Wi-Fi, Bluetooth, television broadcasting, and most importantly GSM, CDMA and LTE mobile transmission.

Ultra High Frequency

Super high frequency is in the range of ____________. It can only operate in ____________ since any obstruction in between the transmitter and receiving station will break the communication.

3 GHz to 30 GHz line-of-sight path

It is commonly used in point-to-point communication, satellite systems, digital TV broadcasting in Ku band (DTH service – direct to home), Wi-Fi (5GHz channel), microwave ovens and mobile networks.

Super High Frequency

System design is extremely hard in _______ due to its smaller wavelength and complexity.

SHF band

is the highest in RF frequency spectrum which range between 30 GHz and 300 GHz.

Extremely High Frequency

only used in advanced communication systems due to its complex nature and line of sight requirement. Used in radio astronomy and remote sensing (weather analysis). It is suggested to use for high-speed internet systems like 5G technology for future transmission networks due to large bandwidth availability

Extremely High Frequency

Advantages of Wireless Communication

Convenience Mobility Scalability Cost

Disadvantages of Wireless Communication

Security Interference Range Reliability

is a device that converts electrical signals into radio waves and vice versa. It is used in communication systems to transmit and receive radio signals.

Antenna

are used in a wide variety of applications, including radio broadcasting, television broadcasting, cellular phone networks, and satellite communication.

Antenna

There are many different types of antennas, each with its own unique properties. Some of the most common types of antennas include:

Monopole Dipole Yagi-Uda Loop Bowtie Parabolic

is a half-dipole antenna, meaning that it consists of a single conductor, such as a metal rod, mounted over a ground plane.

Monopole Antenna

are omnidirectional, meaning that they radiate and receive signals in all directions.

Monopole Antenna

are commonly used in cellular phone antennas, car radios, and AM/FM broadcast antennas.

Monopole antennas

Is the simplest type of antenna. It consists of two parallel conductors of equal length, separated by a small distance.

dipole antenna

are bidirectional, meaning that they radiate and receive signals in two opposite directions.

Dipole antennas

are commonly used in television antennas, Wi-Fi antennas, and amateur radio antennas.

Dipole antennas

Yagi-Uda antenna, also known as a "________" or a "__________" is a type of directional antenna.

Yagi antenna Fishbone antenna

It consists of a dipole antenna and a number of parasitic elements, such as directors and reflectors. Can be used to focus radio waves in a specific direction.

Yagi-Uda Antenna

are commonly used in television antennas, microwave relay systems, and satellite communication systems.

Yagi antennas

A _________ is a type of antenna that consists of a loop of wire. It is omnidirectional, but they have a lower gain than dipole antennas

loop antenna

are less susceptible to interference from other radio signals, making them ideal for use in noisy environments.

Loop antennas

are commonly used in AM/FM radio antennas, RFID antennas, and aircraft navigation antennas.

Loop antennas

A __________ is a type of antenna that consists of two triangular metal plates arranged in a bowtie shape.

bowtie antenna

are bidirectional and have a higher gain than dipole antennas. Are also less susceptible to interference from other radio signals.

Bowtie antennas

are commonly used in television antennas, satellite communication systems, and radar systems.

Bowtie antennas

A is a type of highly directional antenna.

parabolic antenna

It consists of a parabolic dish reflector and a feed antenna. The parabolic dish reflector reflects radio waves towards the feed antenna, which focuses the radio waves in a specific direction.

Parabolic Antenna

are commonly used in satellite communication systems, radar systems, and microwave relay systems.

Parabolic antennas

MICROPROCESSOR MIDTERM MODULE 1

Annaricha Mae Dalag · 28問 · 2年前

MICROPROCESSOR MIDTERM MODULE 1