Low-Profile Planar Inverted-F Antenna for Ultrawideband Applications

Abstract

235 I. INTRODUCTIONRecently, ultrawideband (UWB) communication systems have received increasing attention for automotive, medical, and radar applications because they support a high data rate, low power consumption, and are low cost [1][2][3][4][5]. Because UWB communication systems are integrated into a variety of electronic devices, the available area for a universal UWB antenna is limited [6]. The UWB antenna should not only have a compact size, a low profile, and a low cost, but should also have a stable and omnidirectional radiation pattern [7][8][9]. Also, the Federal Communications Commission (FCC) requires that UWB antennas operate in the frequency range from 3.1 GHz to 10.6 GHz [10].The planar inverted-F antenna (PIFA) with a resonant length of /4 has a compact size, a low profile, is lightweight, and is also easy to fabricate, which makes the PIFA a good candidate for radio communication applications [11,12]. However, because the PIFA features a narrow bandwidth, it is not suitable for UWB applications [13]. In order to satisfy the required performance over the UWB frequency range, the PIFAs with bandwidth enhancement technologies have been studied [13][14][15][16]. Typical bandwidth-enhanced PIFAs include an inverted-L-shaped parasitic element and a rectangular parasitic element [13], double posts [14], a dual-PIFA [15], and a parasitic planar inverted-L element [16]. However, these antennas are not suitable for UWB applications due to their large height and size.To overcome this problem, a low-profile PIFA with a slotted ground plane for UWB applications is proposed. This antenna has a bandwidth covering the full UWB frequency range (3.1 GHz to 10.6 GHz), with improved impedance matching by utilizing the additional resonance of the slot on the ground plane. The antenna has a stable and nearly omnidirectional raLow-Profile Planar Inverted-F Antenna for Ultrawideband ApplicationsJunsik Yun 1,2 • Jaehoon Choi 1,* AbstractIn this paper, a low-profile planar inverted-F antenna (PIFA) for ultrawideband (UWB) applications is proposed. The antenna consists of a PIFA and a ground plane with a slot. The addition of the slot not only improves the impedance matching of the PIFA but also forms an additional resonance. Therefore, the proposed antenna has a wideband characteristic covering the full UWB frequency range (3.1 GHz to 10.6 GHz) and a stable and nearly omnidirectional radiation pattern. The antenna also has a smaller volume and thickness compared to previous UWB PIFAs.Key Words: Low-Profile Antenna, PIFA, Slot, UWB.Manuscript received August 11, 2016 ; Revised August 11, 2016 ; Accepted August 12, 2016. (ID No. 20160811-023J) This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

A planar UWB MIMO antenna with gain enhancement and isolation improvement for the 5G Mobile platform

“…Now, we design Antenna #2 operating at the same frequency band as Antenna #1 by modifying the ground‐slotted PIFA as suggested in Reference . To verify the aforementioned radiation principle at various frequencies, simulated current distributions for Antenna #2 at 3.34 GHz (low frequency), 4.7 GHz (middle frequency), and 6.4 GHz (high frequency) are shown in Figure .…”

“…For Antenna #2, wideband impedance matching is realized by adding a slot in the ground plane. In this design, we have referenced the article Yun and Choi to design Antenna #2 due to its high radiation gains. However, in Reference , the authors did not give a detailed explanation of realizing the high gain performance.…”

“…In this design, we have referenced the article Yun and Choi to design Antenna #2 due to its high radiation gains. However, in Reference , the authors did not give a detailed explanation of realizing the high gain performance. Therefore, in order to find the reason for the antenna's high gain performance, we modified the structure and re‐analyzed both the current and magnetic field distributions.…”

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“…The simulated results were obtained by using HFSS. 20,21 To demonstrate the miniaturization principle of the segmented loop antenna, the equivalent capacitance circuits of Refs. [1,2,3] are extracted and shown in Figure 3.…”

Hybrid Robust Optimization for the Design of a Smartphone Metal Frame Antenna

“…Besides, the total number of experiments is reduced because an OA is used for noise testing. An inverted-F antenna (IFA) with a metal frame [9][10][11] is employed as an example to explain the procedure of the proposed method. The geometry of the IFA is illustrated in Section 2.…”