Compact and closely spaced tunable printed F‐slot multiple‐input–multiple‐output antenna system for portable wireless applications with efficient diversity. Issue 6 (1st November 2014)

• Record Type: Journal Article
• Authors: Elfergani, Issa T.E.; Hussaini, Abubakar Sadiq; Rodriguez, Jonathan; Abd‐Alhameed, Raed A.; See, Chan H.; Jan, Naeem; Zhu, Sharon; McEwan, Neil J.
• Is Part Of: IET science, measurement & technology. Volume 8:Issue 6(2014)
• Page Start: 359
• Page End: 369
• Publication Date: 2014-11-01
• Subjects: MIMO communication -- tuning -- antennas -- lumped parameter networks -- capacitors -- varactors -- radio transceivers; compact tunable printed F‐slot multiple‐input–multiple‐output antenna system -- closely spaced printed F‐slot multiple‐input‐multiple‐output antenna system -- portable wireless applications -- efficient diversity -- global positioning system -- PCS -- distributed control system -- Universal Mobile Telecommunications System bands -- FR4 substrate -- frequency tunability -- lumped capacitors -- I‐shaped branch -- cut‐away ground plane -- varactors -- coupling reduction mechanism -- portable handheld wireless transceiver -- channel capacity -- capacitance 0.75 pF to 2.75 pF -- frequency 1.55 GHz to 2.07 GHz; Measurement -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Periodicals; Nanotechnology -- Periodicals; Electromagnetism -- Periodicals; Medical instruments and apparatus -- Periodicals; 621.3
• DOI: 10.1049/iet-smt.2013.0276
• Languages: English
• ISSNs: 1751-8822

Abstract

Abstract : In this work, miniaturised tunable two‐antenna multiple‐input–multiple‐output (MIMO) systems composed of printed F‐slot shaped are developed to operate in the global positioning system (GPS), personal communication system (PCS), distributed control system and Universal Mobile Telecommunications System bands. The two‐element MIMO antenna occupies a volume of 50 × 37.5 × 1.6 mm 3, and is printed on an FR4 substrate. Initially, the frequency tunability of the MIMO antennas was verified by lumped capacitors with values between 0.75 to 2.75 pF to achieve a tuning range from 1.55 to 2.07 GHz while the low mutual coupling between the radiators was accomplished by adding an I‐shaped branch to a cut‐away ground plane. The two antennas are then loaded with varactors to simultaneously achieve miniaturisation and tunability. Simulation and measurement results demonstrate the successful implementation of a tunable MIMO with coupling reduction mechanism for a portable handheld wireless transceiver. The channel capacity of the proposed antenna is investigated and found to be close to that of a un‐correlated system with efficient diversity in which the mutual coupling across the full bandwidth was better than −13 dB. Owing to the compact size and ease of manufacture, the proposed antennas can be a promising solution for adaptive MIMO systems in handheld devices.