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Enhancement of the antenna bandwidth by coupling the planar inverted‐F antenna and multi‐ultra‐thin slots for handheld devices with metal housing
Author(s) -
Lee ChihHung,
Lin Ding Bing,
Lu GuanHung
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31389
Subject(s) - bandwidth (computing) , planar , folded inverted conformal antenna , electrical engineering , optoelectronics , mobile device , radiator (engine cooling) , materials science , antenna efficiency , radiation pattern , electronic engineering , engineering , antenna (radio) , telecommunications , computer science , physics , optics , computer graphics (images) , operating system
We propose an invisible multi‐ultra‐thin slot antenna and a planar inverted‐F antenna (PIFA) coupling design for handheld mobile devices in complete metal housing systems. To enhance the bandwidth of the traditional single λ/4 PIFA used in a 2.45‐GHz Wi‐Fi system and to consider the strong impact on radiation due to the metal‐housing shielding effect and position of the internal antenna, this design etches 0.1‐mm wide slots on the metal housing using PIFA to excite these slot antennas through coupling. The metal housing is a major radiator that enhances the antenna bandwidth and efficiency. It uses electric and magnetic coupling between the two antennas to achieve the specification bandwidth, and we design the number, gap, and position of slots by investigating the mutual coupling effect. The bandwidth of the proposed structure is 147 and 134 MHz in simulations and in measurements involving the etching of three multi‐ultra‐thin slots, respectively (L = 38 mm, W = 0.1 mm), for 2.45‐GHz usage. The results depict that this design enhances the antenna bandwidth when some slots are etched, especially for handheld devices with metal housing.