• Title/Summary/Keyword: IFA(Inverted F Antenna)

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PIFA and IFA Hybrid Antenna for the Data Communication Terminal (데이터통신 단말기용 PIFA 및 IFA 결합 안테나)

  • Chun, Moon-Kyu;Son, Tae-Ho
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.10 no.4
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    • pp.65-70
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    • 2011
  • In this paper, we designed and implemented a PIFA(Planer Inverted F Antenna) and IFA(Inverted F Antenna) hybrid antenna for the data communication terminal such as smart phone. Studied hybrid antenna has multi-band characteristics by the simultaneous operation both PIFA and IFA under a feeding structure. VSWR measurement of implemented antenna was satisfied 3:1 over GSM900/USPCS/WCDMA band. Measured average gains and efficiencies were -2.19~-3.63 dBi and 43.31~60.33 % for the GSM900 band, and -2.16~-10.67 dBi and 8.56~60.78 % for the USPCS/WCDMA band.

Design of the IPI-IFA using the Inverted PI Feeder (역 파이 급전 방식을 적용한 IPI-IFA)

  • Oh, Kyu-Jong;Son, Tae-Ho
    • Journal of Advanced Navigation Technology
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    • v.13 no.5
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    • pp.662-668
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    • 2009
  • Design of IPI(Inverted PI) feeding internal antenna for the gain improvement of mobile phone was proposed. IPI feeding structure affects on both low radiation resistance of antenna and increase current for the internal antenna such as IFA(Inverted F Antenna). By these facts, antenna fed by IPI can get the gain improvement with increasing radiation efficiency. For the verification, we applied IPI feeding structure to conventional quad band IFA. Measurement shows that IPI-IFA has 0.3~2.0[dB] higher gain than conventional IFA on GSM/DCS/USPCS/WCDMA band.

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Design Technique Using Bypass Capacitor to Improve Antenna Efficiency of Inverted-F Antenna with Band Stop Matching Circuit (Band Stop Matching Circuit이 적용된 Inverted-F Antenna의 Bypass Capacitor를 이용한 안테나 효율 향상 기법)

  • Bae, Jang Hwan;Choi, Woo Cheol;Lim, Seonho;Yoon, Young Joong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.30 no.1
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    • pp.1-7
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    • 2019
  • In this paper, a design technique using a bypass capacitor is proposed to improve the antenna efficiency of an inverted-F antenna (IFA) with a band stop matching circuit (BSMC). The proposed antenna operates in the LTE bands 26 and 5(814~ 894 MHz). The bandwidth of the IFA is expanded from 803~863 MHz to 800~888 MHz using the impedance change caused by the BSMC. To enhance the antenna efficiency in the expanded frequency band, the bypass capacitor is applied to the IFA with the BSMC. The bypass capacitor improves the efficiency of the antenna by reducing the current variation of the IFA with the BSMC. The proposed antenna has a bandwidth of 804~895 MHz and the antenna efficiency increases by more than 10 % in the extended frequency band by using the bypass capacitor.

Hexa-Band Hybrid MIMO Antenna for the Mobile Phone Surrounding Ground (접지에 둘러싸인 휴대폰을 위한 6중 밴드 하이브리드 MIMO 안테나)

  • Lee, Kyeong-Ho;Son, Taeho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.26 no.4
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    • pp.357-364
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    • 2015
  • In this paper, we designed and implemented a PIFA(Planar Inverted F Antenna) + IFA(Inverted F Antenna) hybrid MIMO(Multi Input Multi Output) antenna for the hexa mobile communication service band. By the simultaneous operation both PIFA and IFA using the coupled feeding structure, we tried for application to modern mobile phones that have large ground size. A PIFA is applied to the ground area, and an IFA is applied to no ground small space on top of the phone. A diagonal fed MIMO antenna is implemented PCB embedded type without antenna carrier component. Implemented antenna on the bare board measured within 3 : 1 for VSWR under hexa mobile communication band as CDMA, GSM900, DCS, KPCS, USPCS, and WCDMA. Measured average gains and efficiencies were -5.19~-3.16 dBi and 30.27~48.26 % for the CDMA, GSM900 band, and -9.50~-5.19 dBi and 11.23~30.28 % for the DCS, KPCS, USPCS, WCDMA band. It's shown that studied antenna can be applied to the antenna for the modern mobile phone.

Analysis of Radiation Patterns of Inverted-F Antenna(IFA) on Cylindrical Conducting Body (원통 도체 위에 장착된 역 F 안테나의 방사 패턴 분석)

  • Kim Tae-Hyun;Kim Sung-Wan;Lee Jae-Deuk;Park Dong Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.5 s.96
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    • pp.518-525
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    • 2005
  • In this paper, radiation patterns are simulated and analyzed for inverted-F antenna(IFA) on a cylindrical conducting body like a satellite launcher. First, parametric studies are performed for IFA itself to analyze its characteristics. Then, IFAs on a cylindrical conducting body are simulated and analyzed. Especially, by changing the number of IFAs, the length and the diameter of the cylinder radiation patterns are simulated and analyzed. Finally, IFAs on a cylindrical conducting body are fabricated and their return losses and radiation patterns are measured. Good agreements are observed between the simulated and measured results.

Hybrid Antenna for the All Band Mobile Phone Service Including LTE (LTE를 포함한 전 휴대폰 서비스 대역 하이브리드 안테나)

  • Lim, Seung-Jin;Son, Tae-Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.7
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    • pp.737-743
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    • 2011
  • In this paper, we designed and implemented a Monopole+IFA(Inverted F Antenna) hybrid antenna using the coupled feeding structure for the all band mobile phone. Studied antenna has wide band characteristics by the simultaneous operation both monopole and IFA under the coupled feeding structure. An antenna has designed PCB embedded type without antenna carrier component for the low in cost. Implemented antenna has within 2.5:1 for VSWR under LTE/CDMA/GSM900/DCS/USPCS/WCDMA/WiBro/WiFi in all band for the mobile services Measured average gains and efficiencies were -3.98~-0.09 dBi and 40.03~97.99 % for the LTE, CDMA, GSM900 band, and -3.90~-1.01 dBi and 40.70~79.31 % for the DCS, USPCS, WCDMA, WiBro, WiFi band. It's shown that studied antenna can be applied to all band mobile phone antenna including LTE.

Analysis of Coupling Between Digital Noise and Portable Smart Terminal Antenna According to Antenna Types (휴대용 스마트 단말기 안테나 타입에 따른 디지털 노이즈와 안테나의 결합 분석)

  • Kim, Joonchul
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.873-877
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    • 2019
  • In this paper, we analyze the degree of digital noise coupling for Inverted F Antenna (IFA) and Loop Antenna, which are representative types of portable terminal antenna, using characteristic mode. Firstly, the degree of coupling according to the direction of digital signal lines and characteristic mode current of the printed circuit board (PCB) including the antenna is compared and analyzed, and based on this result, the coupling between WiFi antenna and the front camera noise is analyzed. For analysis, the digital signal line and ground line of the FPCB of the camera module are modeled as a loop feeder that excites the characteristic mode of the PCB ground and the change of noise coupling according to the antenna types are analyzed.

Triple-band printed antenna based upon switching properties (전환특성을 이용한 삼중대역 인쇄형 안테나)

  • Lee, Young-Soon;Yoo, Jin-Ha
    • Journal of Advanced Navigation Technology
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    • v.15 no.2
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    • pp.197-203
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    • 2011
  • A triple-band antenna which can be used at GSM900, PCS1900 and Bluetooth(or Wi-Fi) frequency band is proposed. The proposed antenna is designed based upon switching between IFA(Inverted F Antenna) that has a resonant length of ${\lambda}/4$ and loop antenna that has a resonant length of ${\lambda}/2$. It can be applied to triple-band only by use of single printed pattern due to the switching characteristic. It is designed by use of the IFA for the application to the GSM900, while it is designed by use of the loop antenna for the application to the PCS1900 and by use of additional pattern of IFA for the application to the Bluetooth(or Wi-Fi) respectively. As a result, it has been observed that the proposed antenna satisfies the required return loss(${\leq}10dB$) and also has efficiency(${\geq}80%$) over the whole band. Moreover the proposed antenna has omni-directional radiation pattern which is suitable to apply to the mobile phone.

Fabrication of a Subminiature 3 Dimensional Antenna for the Mobile Phone Handset (이동 통신 단말기용 초소형 3차원 안테나 제작)

  • Hong, Min-Gi;Son, Tae-Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.12
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    • pp.1455-1461
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    • 2008
  • We implemented a subminiature internal antenna that is around 1 cc volume for the mobile phone. The fundamental type of studied antenna is IFA(Inverted F Antenna), and this antenna is designed to be improved efficiency and gain due to minimum current cancellation by the avoidance of multiple bending pattern. For the implementation of multiple band, helix is applied to compensate for short antenna length for low frequency band, and a 3 dimensional pattern is used for high frequency band. We made two kinds of 3D structure antenna. One is a 1 cc volume antenna for GSM/DCS band on the bare board set, and the other is a 1.5 cc volume for the GSM/USPCS mobile phone set. Measurements showed good gain performance that average gain of two antenna on each band are $-3.46{\sim}-0.45\;dBi$ and $-4.80{\sim}-3.29\;dBi$ respectively.