NDLI: Mobile antenna performance improvement by ground mode tuning using a closed loop

Content Provider	IET Digital Library
Author	Yoo, Sangmoon Qu, Longyue Kim, Joonchul Kim, Hyeongdong
Abstract	An antenna with a modified ground plane is proposed for modern mobile devices in the wireless communications. The proposed antenna design comprises a planar inverted-F antenna with a feeding capacitor (C F) at the top side of the ground plane, and an additional closed loop with lumped inductors (L1 and L2) at the end of the ground plane. The closed loop is connected to the small ground plane for ground mode tuning so that the ground mode resonant frequency is equal to the operating frequency. In the simulation, the −10 dB bandwidth is 140 MHz (from 2.39 to 2.53 GHz) without the closed loop, and is 320 MHz (from 2.34 to 2.66 GHz) with the proposed closed loop. The measured efficiency is 61% on average from 2.3 to 2.6 GHz for the proposed antenna, and is 36% for the reference antenna. The ground mode resonance can be easily tuned, and the proposed technique is a versatile approach for antenna performance improvement.
Starting Page	1121
Ending Page	1126
Page Count	6
ISSN	17518725
Volume Number	11
e-ISSN	17518733
Issue Number	Issue 8, Jun (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/11/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2016.0638
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2017-02-22
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antenna Accessory Antenna Design Antenna Feeds Bandwidth 140 MHz Bandwidth 320 MHz Closed Loop Antenna Efficiency 36 Percent Efficiency 61 Percent Feeding Capacitor Frequency 2.34 GHz to 2.66 GHz Ground Mode Resonant Frequency Ground Mode Tuning Loop Antenna Lumped Inductors Mobile Antenna Mobile Antenna Performance Improvement Mobile Device Modified Ground Plane Planar Inverted-F Antenna Reference Antenna Single Antenna UHF Antenna Wireless Communication
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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