• Title, Summary, Keyword: Flexible antennas

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Compact and Flexible Monopole Antenna for Ultra-Wideband Applications Deploying Fractal Geometry

  • Geetha, G;Palaniswamy, Sandeep Kumar;Alsath, M. Gulam Nabi;Kanagasabai, Malathi;Rao, T. Rama
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.400-405
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    • 2018
  • This paper presents a compact ultra-wideband (UWB) flexible monopole antenna design on a paper substrate. The proposed antenna is made of iterations of a circular slot inside an octagonal metallic patch. This fractal-based geometry has been deployed to achieve compactness along with improved bandwidth, measured reflection coefficient -10 dB bandwidth ranging from 2.7 to 15.8 GHz. The overall size of the antenna is $26mm{\times}19mm{\times}0.5mm$, which makes it a compact one. The substrate used is paper and the main features like environment friendly, flexibility, green electronics applications and low cost of fabrication are the key factors for the proposed antenna. The aforementioned UWB prototype is suitable for many wireless communication systems such as WiMAX, WiFi, RFID and WSN applications. Antenna has been tested for the effect of bending by placing it over a curved surface of a very small radius of 10 mm.

Bending Characteristic of a Flexible Antenna (Flexible Antenna의 Bending 특성)

  • Kim, Ho-Jin;Lee, Seon-Hyeon;Lee, Young-Hun;Lee, Sang-Seok
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.9
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    • pp.888-896
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    • 2011
  • In this paper, we studied characteristics of the bent antenna febricated on Flexible-PCB. Flexible-PCB consisting of a polyimide has dielectric constant 3.5, thickness 0.125 mm. Proposed antennas which operates at Bluetooth band are a rectangular loop antenna and a loop antenna with inverted-L type stub. We compared the input matching and radiation characteristics of the proposed antennas under eight kinds of bending conditions.

Fabrication and analysis of flexible and transparent antenna on polyamide substrate for laptop computer (폴리아미드 기판에 제작된 노트북용 플렉서블 투명 전극 안테나의 제작 및 분석)

  • Lee, Changmin;Kim, Ilkwon;Kim, Youngsung;Kim, Yongjin;Jung, Changwon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.7
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    • pp.4457-4462
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    • 2014
  • This paper presents an antenna design that can be applied to flexible transparent conducting film. The antennas shaping PIFA (Planar Inverted F-shpae Antenna) were produced on polyamide substrates, which are flexible. The IZTO/Ag/IZTO multilayer films were used for the antennas and exhibited superior electrical, optical and flexible characteristics. This study compared the transparency and performance of two antennas (IZTO/Ag/IZTO multilayer film, and Ag monolayer film). The operation frequencies were set to 5.18~5.32 GHz of WLAN (802.11a). The performance showed a maximum efficiency and peak gain of 89 % and 5.86 dBi, respectively.

Design of Electro-Thread Embroidery UHF RFID Tag Antennas with Character Shapes (글자 모양의 자수형 도전사 UHF RFID 태그 안테나 디자인)

  • Choi, Jae-Han;Chung, You-Chung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.10
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    • pp.1114-1120
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    • 2009
  • The conductivity of various electro-threads is analyzed, and the washable electro-thread embroidery UHF RFID tag antennas using the character shape without T-matching structure are designed by adding a T-matching structure. The RFID tag antenna using the electro-thread is easy to be embedded on a cloth as a wearable antenna because it is flexible and different from general copper inlay shape and tape type tag. The embroidery tag antennas are designed with the English alphabet 'F' and the Korea alphabet 'ㄹ' character. Those are easy to be applied to general clothes. The parameters of antennas are optimized and fabricated. The characteristics and the reading range patterns of the tag antennas are measured. The reading ranges of wet tags(tap water, sea water and soapy water) are tested and compared.

The ink jet printing of high conductivity circuits on various substrates using polymer capped nano-particle silver

  • Edwards, Charles O.;Howarth, James;James, Anthony
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.814-816
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    • 2005
  • In this paper, we describe how specially developed polymer capped, nano-particle silver inks can be used to print circuitry for applications like displays, RFID antennas and "disposable electronics". The requirements of printing on temperature sensitive flexible substrates (such as polymer films and papers) that require low temperature curing is also discussed.

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UHF RFID Dipole Tag Antenna Design Using Flexible Electro-Thread (도전사를 이용한 UHF RFID 다이폴 태그 안테나 설계)

  • Kim, Yeon-Ho;Chung, You-Chung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.1
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    • pp.1-6
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    • 2008
  • A wearable T-matching dipole UHF RFID tag antenna has been designed using conductive electro-thread. The conductivity of the electro-thread has been measured depending on the number of twisted thread. The measured conductivity has been used for simulation to have accurate simulation results. The flexible electro-thread or fabric has been used for fabricating the antenna instead of using copper tape since the electro-thread is more flexible and wearable than copper tape. The return loss and reading range of the fabricated electro-thread UHF RFID tag antennas have been tested. The reading range is approximately 2.4 m.

Wideband Marchand Balun Using Flexible Printed Circuit (연성 인쇄 회로를 이용한 광대역 Marchand 발룬)

  • Lee, Sun-Ho;Joo, Sung-Ho;Lee, Hai-Young
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.2
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    • pp.111-117
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    • 2007
  • In this paper, a new marchand balun using broadside-coupled coplanar waveguide(CPW) on flexible printed circuit (FPC) is proposed. The proposed balun is designed based on the coupled line theory. The fabricated balun shows compact size and improved performance compared to the conventional microstrip line marchand balun. Measured amplitude and phase imbalance between the two balanced output ports are within 0.2 dB and $1^{\circ}$ respectively in a wide frequency range($1.63{\sim}3.44$ GHz). The proposed balun is expected to be used between various antennas and RF front-ends as a functional interconnection.

Suboptimum Decoding for Space-Time Trellis Codes in Slowly Fading Channels (느린 페이딩 채널에서 공간-시간 트렐리스 부호의 준최적 복호법)

  • Shin Sang-Seop;Kim Young-Ju
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.8C
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    • pp.771-776
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    • 2006
  • We present a suboptimum decoding method for space-time trellis codes, which include maximum $likelihood(ML)^{[1]}$ and principal ratio $combining(PRC)^{[2]}$, over quasi-static flat fading channels. In the proposed scheme, the receive antennas are divided into K groups and the PRC is applied to each group, showing a flexible performances between ML and PRC. When K is determined, we also propose the optimum grouping rules and performance index(PI), which simply anticipate the relative performances. Moreover the performances are also evaluated when receive antennas are correlated. Finally, Computer simulations corroborate those theoretical results.

A Study of Flexible T-DMB Antenna Using Rectangular Stub and Matching Circuit (매칭 회로와 구형 Stub를 이용한 Flexible T-DMB 안테나 구현에 관한 연구)

  • Kim, Ho-Jin;Lee, Seon-Hyeon;Lee, Young-Hun;Lee, Sang-Seok
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.2
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    • pp.236-244
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    • 2011
  • In this paper, we proposed flexible T-DMB dipole-shaped antenna that has strength of glass antenna and also has portability and ease of production. The input impedance of antenna according to vehicle body-effect was considered in order to install the antenna on the top of the front window. Installation position of on-glass antennas are changeable defends on driver, so we proposed Interdigital capacitor in feeding point to achieve matching characteristic with no position limit. The measurement result showed good return loss characteristic-below -6 dB in the T-DMB frequency band and maintained fixed resonant frequency.

Reconfigurable Beam-Steering Antenna Using Dipole and Loop Combined Structure for Wearable Applications

  • Ha, Sang-Jun;Jung, Young-Bae;Kim, Yong-Jin;Jung, Chang-Won
    • ETRI Journal
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    • v.34 no.1
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    • pp.1-8
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    • 2012
  • This paper proposes a reconfigurable beam-steering antenna using a bended dipole and a loop. The radiation patterns of the two antennas are cancelled or compensated, and headed towards a specific direction when the dipole and loop antenna are combined at a reasonable ratio. The proposed antenna can steer the beam directions by controlling the operation of two artificial switches. The proposed antenna was manufactured on a PCB (FR-4) and a flexible PCB (polyimide). In the case of the antenna that was fabricated on a PCB, the maximum beam directions were $+50^{\circ}$, $0^{\circ}$, and $-50^{\circ}$ in the azimuth direction using the two artificial switches, and the antenna gain was 1.96 dBi to 2.48 dBi in the operation bandwidth of 2.47 GHz to 2.53 GHz. Also, the antenna was fabricated on a flexible PCB and measured under various bending conditions for wearable applications.