Single and Double Layer Planar Multiband PIFAs

Abstract

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A Multiband Quasi-Yagi Type Antenna

“…Several studies have reported applications and technologies of the multiband antenna design, including the internal quad-band handset antenna of compact size [2], single and double layer multiband planar inverted-F antenna (PIFA) [3], multi-resonant monopole antenna [4], and multiband multiple ring monopole antenna [5]. Different from the multiband antenna, broadband antennas have been designed for high speed transmission rates and high capacity broadband services.…”

“…This antenna possesses advantages such as high gain, narrow beam, and low side lobes, but has not received much attention and found popular applications since it was first presented by Kraus[1]. Literatures investigating it are limited, e.g., Conti et al [2] reported a microstrip version of the array, and H. Nakano [3]- [11] analyzed its radiation characteristics and introduced some extensions.…”

“…One acts as radiation elements, and another acts as transmission lines that provide a phase delay of 360 at resonance to ensure the in-phase excitation of all the radiation elements. A grid array antenna may be categorized as a wire grid array antenna [1], [4]- [6], [8], [9], [11] or a microstrip grid array antenna [2], [3], [7], [10], [12] by that its grid cells are formed by metal wires or microstrip lines. In comparison with the former, the latter is easier to be fabricated because it allows the use of simple, low cost, and accurate microstrip fabrication techniques [2].…”

“…Firstly, the input impedance of the grid array antenna, as revealed in [3], [7], sometimes is much higher than 50 , which means an impedance transformer is necessary if the antenna is fed from a commonly used 50 coaxial line. Secondly, the frequency bandwidth of the grid array antenna is narrow.…”

A Frequency Tuning Method for a Planar Inverted-F Antenna

“…PIFAs can be modified to operate over multiple frequency bands by using, for example, parasitic antenna elements and/or slitting the antenna element to form several paths for surface currents. Recently, PIFA structures covering the frequency range of six telecommunication standards have been reported [8], [9]. A common approach to tuning the operating frequency of a PIFA is to electrically reconfigure a short circuit connection with an external tuning circuit.…”