• Title/Summary/Keyword: Small Antenna

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Dual-Fed Small Repeater Antenna with High Isolation (높은 격리 특성을 갖는 이중 급전 방식 초소형 중계기용 안테나)

  • Seong, Cheol-Min;Jang, Jae-Su;Ha, Jae-Kwon;Park, Dong-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.6
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    • pp.661-668
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    • 2012
  • In this paper, a dual-fed small ICS repeater antenna with high isolation is designed, fabricated, and measured. Bandwidth and gain are optimized by changing the stub lengths near main patch and power divider, and also by changing the size of parasitic patch. To improve the isolation characteristic of the antenna, a dual-feeding method is applied in designing the antenna. The fabricated antenna has a VSWR less than 2, a gain over 7 dBi, and an isolation between the donor and the server antennas less than -65 dB from 1,920~2,170 MHz for 3G mobile communication.

Design of a Broadband Small WLAN Antenna (광대역 소형 WLAN 안테나 설계)

  • Kim, Tae Yong;Lee, Jong-Ig
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.10a
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    • pp.65-67
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    • 2015
  • In this paper, small WLAN antenna was designed and investigated. Proposed antenna was configured for microstrip patch antenna ($29mm{\times}29mm$) that was mounted on RF4 dielectric substrate (relative permittivity 4.4, thick 1.6mm, tangent loss 0.025) with $45mm{\times}45mm$. In order to obtain a wide band characteristic, the cutting process was 3.2mm diagonal corners of the patch antenna located on the top of the substrate. Antenna feeding position for 50 ohm impedance matching was decided to be 5.1mm at the central axis in the horizontal direction. As a result, frequency bandwidth satisfying the condition of VSWR<2dB was 2.365-2.45GHz (85MHz, 3.53%) for considering WLAN.

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A Corner-Truncated Equilateral-Triangular Microstrip Antenna and Its Applications for Reconfigurable Antennas with Polarization Diversity (모서리가 잘린(Corner-cut) 구조를 가진 정삼각형 마이크로스트립 안테나와 편파 변환 재구성 안테나로의 응용)

  • Sung, Young-Je
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.10
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    • pp.1159-1165
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    • 2008
  • In this paper, a single-feed equilateral-triangular microstrip antenna with truncated corners is used for achieving diverse radiation polarization. The proposed antenna is excited by a microstrip line, which is place parallel to an oblique side of the equilateral-triangular patch. Depending on whether the three identically-sized comers of the triangular patch are cut or not, the equilateral-triangular microstrip antenna shows linear polarization(LP) or left-hand circular polarization(LHCP) or Tight-hand circular polarization(RHCP). Based on the equilateral-triangular microstrip antenna with truncated corners, a novel reconfigurable microstrip antenna with switchable polarization sense is also proposed. The proposed reconfigurable antenna has a simple structure, consisting of a corner-truncated triangular patch, a small triangular conductor, and a microstrip line. Using a biased PIN diode between the patch and the small triangular conductor, it can produce LP or RHCP according to bias voltages. From the measured results, low cross polarization level when operated in the linear state and good axial ratio in the circular state are observed.

A CPW-fed Small Monopole Antenna for 5.1~5.8 GHz WLAN (5.1~5.8 GHz 무선랜용 CPW 급전 소형 모노폴 안테나)

  • Choi, In-Tae;Shin, Ho-Sub
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.12
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    • pp.1659-1665
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    • 2019
  • In this paper, a novel design of a compact printed monopole antenna for wireless local area network (WLAN) applications is investigated. The radiator with a patch of different line width and step-shaped ground planes is used to reduce the antenna size. The size of the antenna is 16 × 17 × 1 ㎣ and is fabricated with a photolithography technique. The simulated and measured results agree well. The resonant frequency of the investigated antenna is about 5.2 GHz and can cover an impedance bandwidth of 1 GHz for the measurement result. In addition, we presented the measured radiation pattern, presented the gain and efficiency measured in the required WLAN 5 GHz frequency band (5.15-5.825 GHz), and confirmed that it can be used as a 5 GHz band WLAN antenna. The investigated antenna has a small size, light weight, low cost, omni-directional radiation pattern, high gain, and high efficiency.

Design of Buffer amplifier for a small receiving antenna in broadband (소형 수신안테나용 광대역 Buffer amplifier 설계)

  • Oh Hyun-Jong;Kim Che-Young;Lee Wu-Seong
    • Proceedings of the IEEK Conference
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    • 2004.06a
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    • pp.135-138
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    • 2004
  • Mobile phone antenna needs a small size and light weight for carrying and handling. In case of receiving a wide band TV signal, it would be difficult to obtain a good impedance matching between the antenna and the circuit due to a large capacitive reactance of antenna. Buffer amplifier was established on the teflon( ${\varepsilon}_r=3.38$, h=20mils) substrate by using GaAs FET( CPY30 ) and Silicon RF Transistor( BFP540 ) produced by Infineon and experimented.

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A Low-Cost Method to Evaluate Absorber Reflectivity Using an Antenna with a Small Radiating Aperture and Frequency-Domain Instrument

  • Oh, Soon-Soo;Lee, Young Hwan
    • ETRI Journal
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    • v.35 no.6
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    • pp.1148-1151
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    • 2013
  • We propose a way to measure the absorber reflectivity at a low cost. Only one simple antenna with a small radiating aperture and a frequency-domain instrument are utilized. The previously used equation for calculating the reflectivity of an absorber is inaccurate, and, therefore, a new equation is derived based on multiple reflection analysis and three test models. Notably, the reflection coefficient of the antenna is included in the derived equation. The accuracy of the proposed method is proven through simulation and measurements. It can be easily applied to a product examination by absorber manufacturers and customers owing to its advantages of simplicity, cost effectiveness, and non-cutting examination.

Analysis of inductance loaded small type open-loop travelling wave antenna for moisture mesurement systems (수분측정장치용 인덕턴스 부하 소형 개루우프 진행파 안테나의 특성 해석)

  • 정주수;주창복
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.33A no.7
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    • pp.111-120
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    • 1996
  • In this paper, we proposed an inductance loaded small type open-loop travelling wave antenna model for the suitable VHF/UHF frequency bands moisture measurement systems and analyzed its operating characteristics by galerkin's solution method. This antenna model enables to change the oeprating rsonance frequency from the frequency range 150 Mhz to 1.0 Ghz without changing the antenna design dimensions by only varing the load inductance values and it showed the similar operating charcteristics and narrowband resonance characteristics at each resonance frequencies. Also this model showed the uniformly distriubte dpower radiation characteristics above the loop axis and it can effectively suppress the spurious radiations from its narrowband resonance characteristics.

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Design of CPW-Fed Small Multi-Band Antenna by Using Band Rejection Semicircle Slot

  • Li, Xiao;Lee, Seung-Woo;Kim, Nam;Kim, Chul-Ho
    • Journal of electromagnetic engineering and science
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    • v.11 no.3
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    • pp.207-212
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    • 2011
  • This paper presents a CPW-fed antenna with three slots. The proposed antenna can operate at 1.9~2.1 GHz and 2.9~3.3 GHz which are generated by the two rectangular slots, and 4.5~11.6 GHz which is generated by the main patch. The semicircle-slot is used as a band-notched filter to stop at a desired band (5.150~5.825 GHz) limited by IEEE 802.11a or HIPERLAN/2 applications. The currents concentrate around corresponding slots at the desired band. The proposed antenna is very small in size, with overall dimensions of $27{\times}32{\times}1\;mm^3$ etched onto an FR4-printed circuit board (PCB).

Open-Ended Waveguide Antenna Using a Single Split-Ring Resonator

  • Ju, Young-Rim;Oh, Soon-Soo;Park, Wook-Ki;Park, Hyo-Dal
    • ETRI Journal
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    • v.33 no.2
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    • pp.291-294
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    • 2011
  • This letter proposes an open-ended waveguide antenna with a single split-ring resonator. In contrast to the waveguide antennas incorporating multiple rings reported in a previous study, which exhibited narrow bandwidth, the proposed antenna uses only one ring to achieve broader bandwidth while keeping the aperture small. A single ring has a relatively low quality factor compared to multiple rings. The simulated and measured fractional bandwidth was 4.13% and 4.03%, respectively, which is much broader than the fractional bandwidth of about 1% demonstrated in a previous study. This simple technique can be used in many applications that require small apertures including near-field probes and array elements.

Non-resonant Element in Slotted Ground Plane for Multiband Antenna Operation

  • Picher, Cristina;Anguera, Jaume;Andujar, Aurora;Bujalance, Adrian
    • ETRI Journal
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    • v.36 no.5
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    • pp.835-840
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    • 2014
  • New ways of achieving small, multiband, multifunctional, and standard solutions for mobile handset antennas are demanded in the current wireless market. A non-resonant element of $5mm{\times}5mm{\times}5mm$, a matching network, and a $100mm{\times}40mm$ slotted ground plane are proposed to satisfy mobile market demands that require multiband operation and small antenna solutions. The main advantage of the proposed design is that with only one non-resonant element of considerably small size ($0.015{\lambda}$, 900 MHz), the handset is capable of providing operation at mobile bands.