What is frequency reconfigurable antenna?
A reconfigurable antenna is an antenna capable of modifying its frequency and radiation properties dynamically, in a controlled and reversible manner.
What is reconfigurable microstrip antenna?
A reconfigurable microstrip patch antenna with switchable polarization is proposed in this paper. The proposed antenna consists of a nearly square patch as a radiator truncated at two corners, two small parasitic patches are connected at the corners by using PIN diodes.
How do you create a frequency reconfigurable antenna?
The antenna consists of two symmetric slots that are fed by a fork-shaped microstrip line. Two PIN diodes are loaded in the slots to produce two different frequency bands. Meanwhile, two additional PIN diodes are inserted in the feed line to achieve the pattern reconfigurability.
What is polarization reconfigurable antenna?
The antenna consists of four slots in an X-shape. Four PIN-diode switches are used to re-configure the antenna to a left-hand circular polarization (LHCP) or right-hand circulation polarization (RHCP) antenna. The proposed antenna is studied and designed using computer simulation.
What is reconfigurable intelligent surface?
Reconfigurable intelligent surface (RIS) is a programmable structure that can be used to control the propagation of electromagnetic waves by changing the electric and magnetic properties of the surface. By placing these surfaces in an environment, the properties of radio channels can be controlled.
How does a tunable antenna work?
An antenna tuner (and any of the names in the list below) is a device that is inserted between a radio transmitter and its antenna; when properly adjusted (tuned) it improves power transfer by matching the impedance of the radio to the impedance of the antenna, or the feedline which connects the antenna to the …
What is the approximate relative bandwidth of microstrip patch antennas?
Microstrip-fed patches have very narrow bandwidths, almost invariably less than 5%. Other feed mechanisms have been used to increased bandwidth, including proximity coupling and aperture coupling, both of which require multilayer fabrication.
How can I increase the bandwidth of my microstrip antenna?
Bandwidth of antenna can be increased by various methods such as by increasing the thickness of substrate with low dielectric constant, by probe feeding, by cutting slot, by cutting notches and by different shapes of antenna.
How can you increase bandwidth and gain of the patch antenna?
How reconfigurable intelligent surfaces work?
Where do you deploy reconfigurable intelligent surfaces in the presence of blockages?
Where to Deploy Reconfigurable Intelligent Surfaces in the Presence of Blockages? Abstract: Wireless communications aided by reconfigurable intelligent surfaces (RISs) is a promising way to improve the coverage for cellular users.
What is the theoretical gain of a Hertzian dipole?
The dipole antenna has a power gain of 1.64 or 10 log 1.64 = 2.15 dB above isotropic. Hence option B is correct.
What is Frequency reconfigurable antennas?
Previous reconfigurable antenna designs, their reconfiguration techniques and their applications are reviewed. Frequency reconfigurable microstrip patch antenn a was designed to cater wireless applications in operating in the frequency range of (0 -2.4) GHz.
What are microstrip antennas?
Since microstrip antennas are often integrated w ith other microwave circuits, a compromise has to be made between good antenna performance and circuit design. Basically, microstrip antennas are also referred to as patch antenna. Usually, the radiating elements and feed lines of micorstrip antennas are p hotoetched on the dielectric substrate.
What is the pattern maximum of a patch antenna?
The patch antenna is designed so its pattern maximum is normal to the patch (broadside radiator). T his is accomplished by properly choosing the mode (field configuration) of excitation beneath the patch.
What is the return loss of a 50 ohm microstrip transmission line?
The plot shows a return loss way under -35.0 dB for our chosen dimensions which confirms the design of a 50 ohms microstrip transmission line . Reconfigurable antenna designers need to answer a very important question: will they be able to achieve their design objectives in the most efficient and less expensive way.