• Journal of electromagnetic engineering and science
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• 제15권4호
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• pp.213-218
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• 2015

A novel body-worn spiral monopole antenna is presented. The antenna consists of a ground plane and a spiral monopole. The antenna was designed for Ear-to-Ear (E2E) communication between In-the-Ear (ITE) hearing instruments at 2.45 GHz and has been simulated, prototyped, and measured. The antenna yielded a measured and simulated E2E path gain at 2.45 GHz of -82.1 dB and -85.9 dB, respectively. The radiation pattern of the antenna when mounted in the ear is presented and discussed.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2003년도 기술심포지움 논문집
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• pp.230-233
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• 2003

In this paper, the wideband microstrip patch antennas for the Personal communications Service $(PCS\;:\;1750\~1870\;MHz)$ and International Mobile Telecommunications-2000 $(IMT-2000\;:\;1920\~2170\;MHz)$ dual band are studied. Experimental and simulation results on the dual band antenna are presented. Simulation results are in good agreement with measurements. The experimental and simulation results confirm the wideband characteristics of the antenna. The studied antenna satisfied the wideband characteristics that are required characteristics for above 420 MHz impedance bandwidth for the PCS and IMT-2000 dual band antenna. In this paper, through the designing of a dual band antenna, we have presented the availability for PCS & IMT-2000 base station antenna. An impedance bandwidth of $31\%(VSWR<1.5,\;615\;MHz)$ and a maximum gain of 7dBi can be achieved. The radiation pattern is stable across the passband.

• 한국인터넷방송통신학회논문지
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• 제11권5호
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• pp.81-86
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• 2011

본 논문에서는 반원의 프랙탈 마이크로스트립 패치 안테나를 설계함으로써 안테나를 다중 공진시켜 대역폭의 문제점을 개선하였으며, 이는 IEEE 802.11의 무선랜 대역을 포함하고 IEEE802.16e인 이동형 WiMax의 규격을 동시에 포함할 수 있는 무지향성 안테나를 설계하고 특성을 측정하다. 안테나의 다중공진을 위해 공진주파수, 임피던스정합, 극성 및 방사패턴을 훌륭히 제어할 수 있는 다중 독립 주파수를 만족시키기 위해 세 개의 반원의 프랙탈 패치를 삽입함으로써 무선통신을 위한 안테나를 설계하였다.

• 대한전자공학회논문지TC
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• 제41권5호
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• pp.47-52
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• 2004

본 논문에서는 Blluetooth 주파수 대역 2.402∼2.4800㎓에서 동작하는 마이크로 칩 안테나를 제작하였다. 안테나는 54㎜×19㎜×0.8㎜의 bluetooth PCB 크기와 11㎜×4㎜×1.6㎜의 칩 크기를 갖는다. 설계 제작된 Bluetooth용 칩 안테나는 2.45㎓의 중심주파수에서 10.71%의 대역폭을 갖고, 임의의 급전점 변화에 따라 대역폭과 공진주파수의 변화를 보였다. 또한, 칩안테나의 측정된 방사패턴에서 E-면과 H-면을 비교 분석하였다.

• 전기학회논문지P
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• 제61권1호
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• pp.1-4
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• 2012

In this paper, the planar type modified folded loop antennas for S-DMB band is proposed. The proposed antenna consisted of opened center of a conventional closed loop and folded terminal of microstrip line to inside loop antenna. The sizes proposed antenna was minimized by folding the terminal of the loop. Also, It was minimized reactance value by increasing capacitances between coupled microstrip line. Therefore the proposed antennas compacted about 20% than a conventional loop antenna and increased efficiency of antenna. The proposed antennas got an omni-directional pattern, the antenna gain was 3.67 [dBi] and the bandwidth was 900 MHz (2.6-3.56 GHz) with VSWR${\leq}$2 from the simulated and the measured results. The frequency utilization coefficient was 29.9 %. These properties could satisfy the S-DMB band.

• Journal of electromagnetic engineering and science
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• 제15권2호
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• pp.111-114
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• 2015

In this paper, we have proposed dual-band Phi-shaped slot gap filler antenna for satellite internet service applications. Some properties of the antenna such as return loss, radiation pattern, and gain have been simulated and measured. The proposed antenna has a Phi-shaped slot on the circular patch and is fabricated on the TLX-9 substrate. The radius of the circular patch is 25 mm, and it has a coaxial feeding structure. The dual-band Phi-shaped slot gap filler antenna has high-gain, small-size, simple-structure, and good radiation patterns at each band. The operating frequency band can be tuned by adjusting the length AL and FL of the Phi-shaped slot.

• 한국군사과학기술학회지
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• 제16권1호
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• pp.34-39
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• 2013

In this paper, we described the study on back-radiation level improvement of IFF antenna after briefly describing a design of IFF antenna to distinguish the target as the sub-antenna of surveillance radar. The proposed IFF antenna was minimized a size with use all-in-one power divider as a two-channel IFF antenna forming sum and difference pattern. The method for back-radiation level reduction was studied, and the identified method through the simulation confirmed the decrement throught the measurement.

• 한국전자파학회논문지
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• 제15권1호
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• pp.89-95
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• 2004

본 논문에서는 광대역 특성을 가지면서 소형화가 용이한 다중 미앤더 스트립 모노폴 안테나를 제안하였다. 제안한 안테나는 미앤더 구조를 이용하여 대역폭을 크게 확장시킬 수 있으며, 높이를 줄여 안테나의 소형화를 실현하였다. 최근 주목을 받고 있는 UWB 통신 대역폭을 포함하는 2.9 ㎓∼10.85 ㎓의 넓은 대역폭을 얻을 수 있었으며, 전방향으로 동일한 이득을 갖는 우수한 모노폴 복사패턴을 갖는다.

• Journal of Electrical Engineering and Technology
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• 제9권4호
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• pp.1365-1368
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• 2014

A CPW-fed to CPS dipole antenna of triangular loop director by microstrip tapered balun is proposed for dual and wide band operations, in this paper. The proposed antenna is consisted of a CPW-fed to CPS transform, microstrip tapered balun element, CPS dipole driver and triangular loop director. A dual and wide bandwidth of the proposed dipole antenna is realized by introducing the triangular loop director and taper matching element. The operated frequency bandwidth is 1GHz (2.14~3.14 GHz) and 1.9 GHz (4.6~6.5 GHz) to return loss criterion of less than 10 dB. The measured return loss of the proposed antenna showed good results of the dual and wide band operating frequency and the radiation pattern. The proposed antenna is able to support WLAN wireless communications applications.

• Journal of Advanced Marine Engineering and Technology
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• 제33권8호
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• pp.1239-1245
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• 2009

안테나를 소형화하는 기법에는 많은 접근 방법들이 있다. 본 논문에서는 안테나에 집중소자를 이용한 정합회로를 통하여 안테나의 소형화를 시도하였다. 안테나의 크기의 큰 영향을 주는 그라운드를 PCB 회로 기판과 공유함으로써 형상적인 크기를 최소화하도록 시도하였으며, 안테나의 급전부에 고주파용 집중소자를 이용한 매칭회로를 구성하여 안테나의 임피던스 정합특성을 분석하였다. 본 논문에서 제안된 안테나는 공진주파수의 파장에 비해 매우 작은 크기인 $7\;{\times}\;24\;mm$로 제작되었으며, 860 MHz 대역에서 -18 dB의 반사특성을 보이며 Z-Wave 시스템에 적용가능성을 확인하였다.