• Title/Summary/Keyword: Multi band antenna

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A Design of Multi-band Antenna using asymmetric Bow-tie structure (비대칭 보우 타이 구조를 이용한 다중 대역 안테나 설계)

  • Jang, Jeong-Seok;Kim, Dae-Woong;Choi, Yong-Gyu;Hong, Ui-Seok
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.9 no.2
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    • pp.41-50
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    • 2010
  • In this paper, a multi-band antenna with novel structure for mobile communications is designed and fabricated. The proposed antenna has the Multi-band antenna characteristics by two common-grounded slots with different size and angle. In order to reduce size and to enhance the gain of the antenna, a reflector is consisted of chokes on the three sides. It is optimized by using the CST Microwave Studio commercial software based on the FIA(Finite Integration Algorithm) and PBA(Perfect Boundary Approximation), and then the fabricating and measuring is practiced. As a result of measurement, the reflection coefficient is less than -11 dB(VSWR < 1.8) and the gain of antenna is more than 6dBi at 824~894MHz and 1885-2500MHz.

Design of Multi-band Antenna Using Metal Frame Coupling for Wearable Device Application (메탈 프레임 커플링을 이용한 웨어러블 디바이스용 다중대역 안테나 설계)

  • Lee, Kyunghak;Han, Minseok
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.10 no.6
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    • pp.522-528
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    • 2017
  • In this paper, we propose a multi-band antenna for wearable devices using metal frame coupling. The proposed antenna has a $45mm{\times}35mm$ antenna using metal frame and a ground dual coupling structure. The proposed multi-band antenna in this paper is optimized for small devices such as wearable devices. By using the metal frame as a part of the antenna, the volume of the antenna is reduced and satisfies under VSWR 3:1 impedance bandwidth of 70 MHz (870 ~ 940 MHz) in low frequency band, 280 MHz (1600 ~ 1880 MHz) and 280 MHz (1900 ~ 2170 MHz) in high frequency band. It also verified the applicability of wearable devices by measuring wireless performance indicators such as TRP/TIS.

Design of An Orthomode Transducer for Use in Multi-Band Antenna Feeds (다중 대역 안테나 피드용 직교모드 변환기 설계)

  • 황순미;김영민;이석곤;안병철
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.1
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    • pp.53-59
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    • 2002
  • In this paper, we present design results for an orthomode transducer(OMT) to be used in multi-band antenna feeds. The OMT is realized in the form of a tapered square waveguide, where 18-20 GHz ports are placed in the taper region normal to the waveguide axis, while 30-45 GHz ports are placed in line with the waveguide axis. The reflection coefficient of each port is designed to be less than 20 dB, while the isolation between ports are greater than 15 dB. Thin septa are placed in side ports to reduce the effect of side ports on the return loss of the in-line port. The commercial software HFSS? is used to design the whole structure.

Design of a Multi-Band Antenna with CPWG Feed Line for the Telematics Mobile Device (Telematics 단말기를 위한 CPWG 급전방식 다중대역 안테나 설계 및 제작)

  • Jee, Bong-Soo;Jeong, Gye-Taek;Kim, Woo-Soo;Lee, Haw-Choon;Kwak, Kyung-Sup
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.8 no.2
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    • pp.67-74
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    • 2009
  • In this paper, the multi-band antenna with CPWG(Coplanar Waveguide with Ground) feed for telematics mobile devices is designed and fabricated. The proposed antenna improves the return loss characteristic by using open-circuited stub matching and rectangular slot in the radiation patch. In addition, CPWG structure makes up for the drawback of the CPW which is variation of impedance matching according to the gap variation of the feed line and the ground. The fabricated antenna has 1.4GHz ($1.43GHz{\sim}2.83GHz$, 65%) band width on -10dB (VSWR<2) and the maximum gains are 0.8dBi, 1.34dBi, 2.41dBi, 2.53dBi, 2.6dBi and 1.51dBi on each resonant frequency that are GPS $(1.564GHz{\sim}1.585GHz)$, PCS/DCS $(1.710GHz{\sim}1.984GHz)$, WCDMA $(2.170GHz{\sim}2300GHz)$, Bluetooth/Wi-Fi/WLAN $(2.4GHz{\sim}2.483GHz)$, WiBro $(2.3GHz{\sim}2.4GHz)$, SDMB $(2.605GHz{\sim}2.655GHz)$. It also has an omni-directional radiation pattern of H-Plane.

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Radiation pattern optimization of the multi-band helical antenna used in the mobile phone. (휴대폰에 사용되는 다중대역 헬리컬 안테나의 방사패턴 최적화)

  • 김용석
    • Proceedings of the IEEK Conference
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    • pp.254-257
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    • 2003
  • 본 논문에서는 휴대폰에 사용되는 Multi-band 용 helical antenna 의 radiation pattern 을 체적화하기 위한 방법을 제안하고자 하였다. 일반적으로 GSM 휴대폰에 사용되는 안테나는 GSM, DCS 의 dual band 인 경우가 다수이며 추세에 따라 요즘은 PCS 등을 포함한 triple band 의 안테나가 많이 선호되고 있다. 이러한 multi band antenna 의 radiation pattern 에 영향을 미치는 변수로 본 논문에서는 ground 의 length 와 width 그리고 폴더쪽에 사용되는 LCD 의 ground 와 폴더쪽 기구물에 사용된 EMI spray 등의 변화를 통해 pattern 의 변화를 알아보고 이러한 변수를 조절하여 radiation pattern을 최적화하는 방법에 관하여 논하였다.

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Design of An Orthomode Transducer for Use in Multi-Band Antenna Feeds (다중 대역 안테나 피드용 직교모드변환기 설계)

  • 황순미;김영민;이석곤;안병철
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.184-188
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    • 2001
  • 본 논문에서는 다중대역 피드를 위한 직교모드 변환기를 설계하였다. 직교모드 변환기의 전체적인 모양은 사각 테이퍼진 형태이고, 18-20 GHz 에서 우원 편파와 좌원편파를 발생시키기 위해 테이퍼 부분에 2개의 측면포트를 두고, 직선포트는 30-45 GHz의 광대역에서 -20dB 이하의 반사계수를 가지도록 설계하였다. 직선포트에서의 반사계수 특성을 향상시키기 위해서 측면포트에 얇은 격막을 삽입하였다. 전체적인 설계에 상용소프트웨어인 HFSS$^{R}$를 사용하였다.

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Design of Circularly Polarized Multi Band Antenna for Non-Linear Junction Detector System (비선형 소자 탐지 시스템용 원편파 다중 공진 안테나의 설계)

  • Kim, Jeong-Won;Min, Kyoeng-Sik;Park, Chan-Jin;Jeong, Jae-Hwan;Lee, Sak;Kwon, Hae-Chan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.3
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    • pp.292-299
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    • 2012
  • This paper proposes the design of circularly polarized multi band antenna for a non-linear junction detector (NLJD) system. In order to design for broad bandwidth, the CPW (Co-Planar Waveguide) feeding method is considered in this design. In order to realize the circular polarization, the axial ratio was controlled by inserting a $45^{\circ}$ inclined slot on radiating element and by cutting an edge of the radiating patch. Measurement results of return loss, bandwidth, axial ratio, polarization pattern and gain are agreed well with their simulation results in interested frequency band at 2.4~ 2.44 GHz, 4.84~4.92 GHz, and 7.28~7.32 GHz.

Planar Slot Wideband Antenna for Multiple Communication Services (다중 통신서비스를 위한 평판 슬롯 광대역 안테나)

  • Park, Dong-Kook;Bataller, Miguel Ferrando
    • Journal of IKEEE
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    • v.24 no.1
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    • pp.90-96
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    • 2020
  • As various communication services have emerged due to the development of mobile communication technology, there is a need for a wideband antenna supporting multiple communication services with one antenna. In this paper, we propose a planar slot wideband antenna that can support all the communication services of 3.1~4.99GHz, the low frequency band of 5G, in addition to the existing communication services such as WiFi, LTE 2300/2500, and WiMAX. Through the simulation, the optimized antenna design parameters were obtained, and the antenna was fabricated to implement an antenna with a frequency bandwidth of 1.96~6.01GHz (S11 <-10dB) and presented the radiation pattern and gain of the antenna. The proposed antenna is a multi-band antenna that can provide all the services of LTE, Wifi, WiMAX, and 5G low frequency bands. It can be used as a repeater antenna in radio shadow area such as buildings, dense areas, and ships.

Dual-Band Class F Power Amplifier using CRLH-TLs for Multi-Band Antenna System (다중밴드 안테나 시스템을 위한 CRLH 전송선로를 이용한 이중대역 Class F 전력증폭기)

  • Kim, Sun-Young;Seo, Chul-Hun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.12
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    • pp.7-12
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    • 2008
  • In this paper, a highly efficiency power amplifier is presented for multi-band antenna system. The class F power amplifier operating in dual-band designed with one LDMOSFET. An operating frequency of power amplifier is 900 MHz and 2.14 GHz respectively Matching networks and harmonic control circuits of amplifier are designed by using the unit cell of composite right/left-handed(CRLH) transmission line(TL) realized with lumped elements. The CRLH TL can lead to metamaterial transmission line with the dual-band holing capability. The dual-band operation of the CRLH TL is achieved by the frequency offset and the nonlinear phase slope of the CRLH TL for the matching network of the power amplifier. Because the control of all harmonic components for high efficiency is very difficult, we have controled only the second- and third-harmonics to obtain the high efficiency with the CRLH TL. Also, the proposed power amplifier has been realized by using the harmonic control circuit for not only the output matching network, but also the input matching network for better efficiency.

Modified Slot-Loaded Multi-Band Microstrip Patch Antenna

  • Cho, Man-Shik;Kim, Il-Kwon;Cho, Han-Back;Yook, Jong-Gwan;Park, Han-Kyu
    • Journal of electromagnetic engineering and science
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    • v.3 no.1
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    • pp.23-28
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    • 2003
  • In this paper, a triple-band planar antenna is proposed for the application to miniaturized automobile safety devices operating at X band(10.5 ㎓), K band(24.15 ㎓), and Ka band(34.3 ㎓). The frequency ratio between the resonant frequencies of this antenna can be adjusted from 1.99 to 2.23 for both X band and K band by varying its slit length. Parasitic elements are added on the modified slot loaded antenna to obtain the third resonance. From numerical as well as experimental results, it has been confirmed that this type of antenna is appropriate for planar multi-band antenna systems.