What is the function of receiver antenna?
A receiving antenna performs the reverse of the process performed by the transmission antenna. It receives radiofrequency radiation and converts it into electric currents in an electric circuit connected to the antenna.
What is the function of frequency mixer in super heterodyne receiver?
The function of a frequency mixer in a super heterodyne receiver is that it mixes or multiplies the incoming modulated carrier with the locally generated carrier. It then produces a number of frequencies. The produced frequencies are either the sum or the differences of the frequencies of the received signals.
What is antenna modulation?
A direct antenna modulation (DAM) technique is also introduced, where the radiated far-field signal is modulated by time-varying changes in the antenna near-field electromagnetic (EM) boundary conditions. This enables the transmitter to send data in a direction-dependent fashion producing a secure communication link.
What is the function of Rx mixer?
The mixer is a critical stage of the RF signal chain in a superheterodyne (superhet) receiver architecture. It allows the receiver to be tuned across a wide band of interest, then translates the desired, arbitrary received signal frequency to a known, fixed frequency.
What types of antennas are there?
Antenna Theory – Types of Antennas
| Type of antenna | Examples |
|---|---|
| Wire Antennas | Dipole antenna, Monopole antenna, Helix antenna, Loop antenna |
| Aperture Antennas | Waveguide (opening), Horn antenna |
| Reflector Antennas | Parabolic reflectors, Corner reflectors |
| Lens Antennas | Convex-plane, Concave-plane, Convex-convex, Concaveconcave lenses |
What is the advantage of super Heterodyning?
Super heterodyning is a device that converts high frequency to low frequency There are many advantages of Super Heterodyning. Another advantage of using Super heterodyning is that various components can be designed for a fixed frequency which is cheaper and easier as compared to the designing wideband components.
What do u mean by heterodyne?
verb. heterodyned; heterodyning. Definition of heterodyne (Entry 2 of 2) transitive verb. : to combine (something, such as a radio frequency) with a different frequency so that a beat is produced.
What is directional modulation?
Directional modulation (DM) is an emerging technology for securing wireless communications at the physical layer. This promising technology, unlike the conventional key-based cryptographic methods and the key-based physical layer security approaches, locks information signals without any requirements of keys.
Which of the following are the properties of antenna?
Certain basic characteristics of antenna are listed below:
- Antenna Radiation Pattern.
- Radiation Intensity.
- Directivity and Gain.
- Radiation Efficiency and Power Gain.
- Input Impedance.
- Effective Length.
- Bandwidth.
- Effective Aperture.