Contents
What is Planar inverted f antennas?
The Planar Inverted-F antenna (PIFA) is increasingly used in the mobile phone market. 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.
How does inverted f antenna work?
An inverted-F antenna is a type of antenna used in wireless communication, mainly at UHF and microwave frequencies. It consists of a monopole antenna running parallel to a ground plane and grounded at one end. The antenna is fed from an intermediate point a distance from the grounded end.
Who invented fractal antenna?
Nathan Cohen
Nathan Cohen (“Chip”) – the founder and CEO of Fractal Antenna Systems, Inc. – is a physicist, radio astronomer, and innovator/inventor.
Why is Sierpinski’s triangle a fractal?
The Sierpinski triangle is a fractal described in 1915 by Waclaw Sierpinski. It is a self similar structure that occurs at different levels of iterations, or magnifications. This pattern is then repeated for the smaller triangles, and essentially has infinitely many possible iterations.
Is the Triforce a fractal?
The Sierpiński triangle (sometimes spelled Sierpinski), also called the Sierpiński gasket or Sierpiński sieve, is a fractal attractive fixed set with the overall shape of an equilateral triangle, subdivided recursively into smaller equilateral triangles.
Are fractal antennas better?
Fractals have been used in antennas since 1988 and their advantages are good multiband performance, wide bandwidth, and small area and that reference showed that the gain with small size results from constructive interference with multiple current maxima, afforded by the electrically long structure in a small area.
Why is the planar inverted F antenna used?
The Planar Inverted-F Antenna (PIFA) can be viewed as evolved from a quarter-wavelength monopole antenna and is now widely used in mobile and portable radio ap- plications due to its many attractive attributes such as simple design, lightweight, low-cost, low-profile, confor- mal nature and reliable performance [1-4].
When was the inverted F monopole antenna invented?
The inverted-F antenna is an evolution of the basic quarter-wave monopole antenna. The wire F-type antenna was invented in the 1940s. In this antenna the feed is connected to an intermediate point along the length of the antenna instead of to the base. The base is connected to ground.
What is the impedance of an inverted L Antenna?
Thus, the designer can match the antenna to the system impedance by setting the position of the feed point (RF systems commonly have a system impedance of 50 Ω whereas a λ/4 monopole has an impedance of 36.5 Ω). The inverted-L antenna is a monopole antenna bent over to run parallel to the ground plane.
What are the characteristics of a PIFA antenna?
The effects on the characteristics of PIFA due to changes in the di- men- sions of ground plane, the position of PIFA on ground plane, the length, width, and height of the top radiating plate, and the distance of the shorting plate from the edge of top plate are presented.