How does a PIFA antenna work?
How does a PIFA antenna work?
The antenna is resonant at a quarter-wavelength (thus reducing the required space needed on the phone), and also typically has good SAR properties. This antenna resembles an inverted F, which explains the PIFA name. The Planar Inverted-F Antenna is popular because it has a low profile and an omnidirectional pattern.
What is a micro antenna?
In telecommunication, a microstrip antenna (also known as a printed antenna) usually means an antenna fabricated using photolithographic techniques on a printed circuit board (PCB). It is a kind of internal antenna. They are mostly used at microwave frequencies.
What is a PCB antenna?
PCB antenna is a transducer converting current waves into electromagnetic (EM) waves in a high-frequency PCB. PCB antennas convert current in high frequency into EM waves that propagate into the air. PCB antennas mostly discussed are omnidirectional, directional, and semi-directional antennas.
How do slot antennas work?
Slot antennas operate on the principle that whenever a high-frequency field is present across the slot in a metallic sheet, then energy is radiated. This is the reason when a slot is cut from the surface of the conductive plate then on energizing the slot, the electromagnetic wave is radiated thus acts as an antenna.
Why is patch antenna used?
The patch antenna is mainly practical at microwave frequencies, at which wavelengths are short enough that the patches are conveniently small. It is widely used in portable wireless devices because of the ease of fabricating it on printed circuit boards.
Who invented the patch antenna?
One of the most useful antennas at microwave frequencies (f > 1 GHz). It consists of a metal “patch” on top of a grounded dielectric substrate. The patch may be in a variety of shapes, but rectangular and circular are the most common. Invented by Bob Munson in 1972.
What is the polarization of a patch antenna?
5.9. For example, some patch antennas are approximately half a wavelength on each side. The polarization can be either circular or linear depending on the design of the patch. In a patch antenna, most of the propagation is above the ground plane and can have high directional gain.
Where is slot antenna used?
Slot antennas are usually used at UHF and microwave frequencies at which wavelengths are small enough that the plate and slot are conveniently small. At these frequencies, the radio waves are often conducted by a waveguide, and the antenna consists of slots in the waveguide; this is called a slotted waveguide antenna.
What is a planar inverted-F antenna (PIFA)?
However, its most widespread use is as a planar inverted-F antenna ( PIFA) in mobile wireless devices for its space saving properties. PIFAs can be printed using the microstrip format, a widely used technology that allows printed RF components to be manufactured as part of the same printed circuit board used to mount other components.
What is a dual-band PIFA antenna?
These antennas have been used for telemetry applications at military test ranges, including those supporting Inter-Range Instrumentation Group standards. An R-shaped dual-band PIFA has been proposed for use on military vehicles. The bands to be covered are 225 MHz and 450 MHz.
What is the advantage of FICA antenna over PIFA?
On some phones, grounded parasitic elements are used to enhance the radiation bandwidth characteristics. The folded inverted conformal antenna (FICA) has some advantages with respect to the PIFA, because it allows better volume reuse. Defected Ground Structure (DGS)-integrated microstrip patch has been popular for multiple purposes.
What is the resonant frequency of the Pifa?
The resonant frequency of the PIFA depends on W. If W=L2, then the shorting pin runs the entire width of the patch. In this case, the PIFA is resonant (has maximum radiation efficiency) when: Suppose that W=0, so that the short is just a pin (or assume W << L2 ). Then the PIFA is resonant at:
