Abstract
A dual-feed small-size penta-band PIFA for LTE/WWAN mobile handset applications is presented. The proposed PIFA is composed of a simple U-shaped patch with dual-shorting pins connected to the ground plane. The patch, having a low profile of 5 mm, has dimensions of about 10 × 35 mm2. The antenna is excited at one arm of the U-shaped radiating patch to cover the higher band of GSM1800/1900/UMTS2100/LTE2300/2500, while it is excited at the other arm to realize the GSM900. In this way, the proposed PIFA achieves enhanced bandwidth coverage with no increased dimensions and additional active switches. In addition, the matching networks, employed on both feeds, ensure a high electrical insulation between the low and the high frequency bands, covered by the antenna. The measured antenna efficiency is 45%~50% and over 60% for the lower band and the higher band, respectively. A prototype of the proposed PIFA with dual-feed and dual-shorting pins was fabricated. The measured results including reflection coefficients and radiation characteristics are presented.
Highlights
With the rapid growth of the personal communication services, the development of compact and small-size antennas, for multiband operation, has become a fundamental requirement in antenna design
PIFA [1,2,3,4] is considered as a promising candidate, since its radiative performances are quite independent of the size of the clearance area on the ground plane
Based on the −6 dB return loss which is widely adopted as the design specification of the internal mobile handset antenna, the dual-feed PIFA realizes pentaband operation with a small occupation volume, covering the GSM900/1800/1900/UMTS2100/LTE2300/2500 frequency bands
Summary
With the rapid growth of the personal communication services, the development of compact and small-size antennas, for multiband operation, has become a fundamental requirement in antenna design. The mutual coupling between the radiating elements and the ground plane is increased, which leads to a higher quality factor Q and brings more complex challenges to obtain wideband antennas. In this case, PIFA [1,2,3,4] is considered as a promising candidate, since its radiative performances are quite independent of the size of the clearance area on the ground plane. Detailed considerations concerning the proposed dual-feed PIFA and its operating principles are presented
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