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How inverted f antenna works?
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.
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.
What kind of antenna is an inverted F antenna?
The inverted-F antenna is shown in Figure 1. While this antenna appears to be a wire antenna, after some analysis of how this antenna radiates, it is more accurately classified as an aperture antenna. Figure 1. Geometry of Inverted-F Antenna (IFA).
How is the PIFA planar inverted-F antenna resonant?
The Planar Inverted-F Antenna (PIFA). The PIFA is resonant at a quarter-wavelength due to the shorting pin at the end. We’ll see how the resonant length is defined exactly in a minute. The feed is placed between the open and shorted end, and the position controls the input impedance. Figure 5.
How is an inverted F-antenna a short circuit stub?
The portion of the antenna between the feedpoint and the ground plane is essentially behaving as a short-circuit stub. Thus, the designer can match the antenna to the system impedance by setting the position of the feed point… Wikipedia.com – Inverted F-Circuit
How is the resonant frequency of an inverted F antenna determined?
Inverted-F antennas are typically planar inverted f antenna and is printed directly on the PCB. The resonant frequency is determined by the microstrip dimensions, the antenna aspect ratio, and the contrast between the substrate and microstrip dielectric constants. A larger dielectric constant redshifts the resonant frequency in 2.4 GHz antennas.