• Journal of electromagnetic engineering and science
• /
• 제4권1호
• /
• pp.8-12
• /
• 2004

In this paper, a triple-band printed dipole antenna using parasitic elements is proposed for the multiple wireless services. The proposed antenna is designed and experimentally analyzed at the bands of PCS, IMT-2000, and ISM services. To achieve triple frequency operation, the proposed antenna contains two parasitic elements, which act as additional resonators by coupling from the driving dipole antenna. From the measured results, the resonant frequencies of this antenna are 1.79 ㎓, 2.03 ㎓, and 2.41 ㎓ and the measured impedance bandwidths are 90 MHz(1760∼1850 MHz), 210 MHz(1,930∼2,130 MHz), and 30 MHz(2,400∼2,430 MHz) for VSWR<2. The measured antenna gains are 2.14 ㏈i, 0.9 ㏈i, and 0.5 ㏈i, respectively. Antenna parameters for trifle-band operation are investigated and several antenna characteristics are discussed.

• Journal of electromagnetic engineering and science
• /
• 제14권4호
• /
• pp.367-375
• /
• 2014

In this paper, a novel triple-band circular-ring monopole antenna with a half-circular ring and ground slot for wireless local area network/Worldwide Interoperability of Microwave Access (WLAN/WiMAX) applications is proposed. The proposed antenna consists of one circular ring, a half-circular ring and a rectangular slot in the ground plane. Based on the concept, a prototype of the proposed triple-band antenna was designed, fabricated and tested. The numerical and experiment results demonstrated that the proposed antenna satisfied the -10 dB impedance bandwidth requirement while simultaneously covering the WLAN and WiMAX bands. Furthermore, this paper presents and discusses the 2D radiation patterns and 2D gains according to the results of the experiment.

• 한국전자통신학회논문지
• /
• 제8권10호
• /
• pp.1427-1434
• /
• 2013

본 논문에서는 이동통신용 단말기 PCB Layout 위에 내장형 칩 안테나를 직접 설계하여 DCS(1.71~1.88GHz) 대역, PCS(1.75~1.87GHz) 대역 및 UPCS(1.85~1.99GHz)대역에서 공통으로 사용할 수 있는 이동통신용 트리플밴드 칩 안테나를 설계하였다. 안테나의 특성 해석을 위해서 Single, Dual, Triple Band 안테나를 설계 및 측정하였다. 설계된 안테나들은 제작하여 LTK(Laird Technologies Korea)에서 네트워크 분석기에 의해서 측정되었다. 트리플 광대역 특성은 1.71GHz~1.99GHz의 대역에서 동작하는 설계된 안테나의 측정된 대역폭(V.S.W.R<2.0)을 실현시켰다. 이 안테나의 크기는 $19mm{\times}4mm{\times}1.6mm$으로 설계하여 매우 소형화시켰으며, 칩 안테나의 단점인 좁은 대역폭을 크게 개선시켰다. 그리고 실험 측정 성능들은 시뮬레이션 성능들과 매우 유사함을 보여 주었다.

• 전기학회논문지
• /
• 제63권12호
• /
• pp.1655-1660
• /
• 2014

In this paper, we propose a design of a triple-band microstrip circular patch antenna. The proposed antenna generates the triple frequency resonance at 1.85GHz(LTE), 2.45GHz(ISM) and 5.5GHz(WLAN). Firstly, we design the dual-band antenna. The dual-band antenna consist of the circular patch, slits, and the slot. The circular patch and slot are designed for dual frequency of 2.45GHz and 5.5GHz, respectively. And then the dual-band antenna is combined with additional arm-shaped structure for the triple-band characteristic. The arm-shaped structure is operated as the dipole. It is designed for lowest frequency of 1.85GHz. Each part of the antenna unites to a new structure. In order to design the proposed antenna automatically and optimally, APSO algorithm is adopted. During APSO, the mismatch of the proposed antenna is resolved. The optimal designed antenna has an acceptable return loss(-10dB) at each bands(i.e, 1.85GHz, 2.45GHz and 5.5GHz).

• Journal of information and communication convergence engineering
• /
• 제13권3호
• /
• pp.159-166
• /
• 2015

In this paper, a novel design for a triple-band coplanar waveguide (CPW)-fed monopole antenna for WLAN/WiMAX operations is proposed. The proposed antenna is printed on an FR4 substrate with an area of 22.0 mm × 30.0 mm, a thickness of 1.0 mm, and a relative permittivity of 4.4. The effects of various parameters of the proposed for triple band operation is investigated. Two half circular rings and a microstrip feed line are fabricated on the substrate to achieve triple band operation and good impedance matching. Prototypes of the proposed antenna have been fabricated and tested. Experiment results reveal that the measured return loss exhibits an acceptable agreement with the simulated return loss and satisfies the impedance bandwidth requirement of -10 dB, while simultaneously covering the WLAN and WiMAX bands. In addition, the proposed antenna shows good radiation characteristics and gains in the three operating bands.

• 한국항행학회논문지
• /
• 제26권1호
• /
• pp.29-34
• /
• 2022

본 논문에서는 2.45 GHz 및 5 GHz 무선 랜 주파수 대역과 3.5 GHz WiMAX 주파수 대역에서 동작하는 삼중 다이폴 준-야기 안테나의 설계에 대하여 연구하였다. 제안된 준-야기 안테나는 V-모양 접지면과 직렬로 연결된 세 개의 다이폴로 구성된다. 길이가 가장 긴 반-보우타이 모양의 다이폴은 2.45 GHz 대역에서 공진하고, 중간 길이의 다이폴은 3.5 GHz에서 공진한다. 길이가 가장 짧은 다이폴은 5 GHz 대역에서 공진한다. 다이폴의 길이와 폭, 다이폴 사이의 간격을 조절하여 2.45 GHz, 3.5 GHz 및 5 GHz 대역에서 동작하는 삼중 대역 지향성 안테나를 설계하였고, FR4 기판 상에 45 mm × 55 mm 크기로 제작하였다. 제작된 안테나는 전압 정재파비가 2 이하인 대역이 2.32-2.57 GHz, 3.26-3.69 GHz, 4.50-6.56 GHz로 설계된 삼중 대역에서 동작하는 것을 확인하였다. 이득은 세 대역에서 3 dBi 이상을 유지하였다.

• Journal of electromagnetic engineering and science
• /
• 제3권1호
• /
• pp.23-28
• /
• 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.

• Journal of information and communication convergence engineering
• /
• 제6권2호
• /
• pp.172-176
• /
• 2008

This paper presents a novel feeding structure of the triple-band internal antenna which covers CELLVLAR/DCS/US-PCS bands. The proposed antenna consists of a U-slot patch radiator with a shorting post connected with ground plane and symmetric feeding lines with respective a feeding and shorting posts on both faces of the fixed FR-4 substrate. Through the simulation and experimental results, the proposed antenna is confirmed to have the features of less interference with a human head/body, broad bandwidth, desirable radiation patterns and efficiency for triple-band applications.

• 한국정보통신학회논문지
• /
• 제11권12호
• /
• pp.2210-2216
• /
• 2007

본 논문은 휴대 단말기에 적용할 수 있는 삼중대역(Triple-band) 프라스틱 칩 안테나에 관하여 연구하였다. 프라스틱 칩은 PVC(Polyvilyl chloride)계열의 Foamex 매질을 사용하였으며, 전기적인 특성은 유전율이 1.9이고, 절연밀도는 112KV/cm이다. 프라스틱 칩 안테나는 세라믹 칩 안테나보다 잘 파손되지 않고, 이득과 효율이 좋은 장점을 가지고 있다. 본 논문에서는 4종류의 삼중대역 프라스틱 칩 안테나를 제작하고 실험하였다. 실험 결과 삼중대역에서 공진하였고, 안테나 이득은-2dB이상이고, 안테나 패턴은 일반적인 칩 안테나와 비슷한 전 방향 특성을 갖는다. 따라서 Foamex 매질을 이용하여 구현된 안테나는 삼중대역용 휴대폰과 다양한 무선통신시스템에 적용될 수 있다.

• Journal of electromagnetic engineering and science
• /
• 제15권1호
• /
• pp.6-13
• /
• 2015

In this paper, a novel monopole antenna for WLAN/WiMAX application is presented. The proposed antenna consists of two arc-shaped strips, a vertical strip, and a slot in the ground plane. In this study, a prototype of the proposed triple-band antenna was designed, fabricated, and tested. The quantitative and experimental results demonstrate that the proposed antenna satisfy the -10 dB impedance bandwidth requirement of 440 MHz for 2.4/2.5 GHz bands (from 2.26 to 2.70 GHz), 970 MHz for 3.5 GHz bands (from 3.27 to 4.24 GHz), and 870 MHz for the GHz bands (from 5.08 to 5.95 GHz), while simultaneously covering the WLAN and WiMAX bands. In addition, the presented triple-band antenna has an omnidirectional radiation pattern at all three frequency bands with an antenna gain of 4.45 dBi for the lowest band, 2.04 dBi for the middle band, and 3.98 dBi for the highest band.