• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.7
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• pp.663-668
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• 2003

In this paper, a CPW fed slot antenna with novel broadband feed structure is presented. To enhance the impedance bandwidth of the slot antenna we proposed the broadband feed structure of new bow-tie slot which is combined with four λ/2 rectangular radiation slot and inductively coupled. The measured 10 dB impedance bandwidth is about 60 %(5.2∼9.4 GHz) and the simulated antenna gain is about 6 dBi at 7.36 GHz.

• Journal of Advanced Navigation Technology
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• v.14 no.6
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• pp.817-823
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• 2010

Design of IPI feeding structure affecting the antenna gain improvement of mobile phone was investigated. IPI feeder which based on the T matching theory increase line current for internal antenna such as IFA. So IPI feeder makes higher radiation resistance, and also increases the gain with increasing radiation efficiency. To verify IPI feeding effect, feeder is applied to conventional CDMA/DCS dual band IFA. Measurement shows that IPI-IFA has 0.5 ~ 1.4[dBi] higher gain than conventional IFA at CDMA/DCS band. Resonant frequency did not change.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2000.11a
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• pp.113-116
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• 2000

평행평판의 원면에 위치한 슬릿을 통하여, 슬릿의 바로 윗 부분에 도체 스트립이 있을 때 일어나는 전자기적 결합 현상에 대하여 살펴보았다. 슬릿의 폭이 파장에 비하여 매우 작을 때와 매우 클 때의 두 경우로 나누어서 기술하였다. 슬릿의 폭이 좁은 경우는 기존의 개구결합(aperture-coupled) 마이크로스트립 안테나에 해당되며 슬릿의 폭이 넓은 경우는 기존의 proximity-coupled 마이르로스트립 안테나에 해당된다. 본 연구의 결과는 기존의 마이크로스트립 안테나의 급전구조와 기존의 마이크로스트립 누설파 안테나의 급전구조 설계에 도움을 줄 것으로 생각된다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.16 no.10 s.101
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• pp.982-988
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• 2005

An analytic solution of circular aperture antenna with a feed transition is presented using a hybrid method of generalized scattering matrices and integral transform. The method can give an analytic solution to antennas with integrated filters or mode converters, etc. Scattering matrices and integral transform techniques are combined to accommodate discontinuities connected between an aperture and a feed waveguide, and radiated field from the aperture. The method gives radiation fields as well as return losses of the antenna.

• Journal of the Institute of Electronics Engineers of Korea TE
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• v.37 no.2
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• pp.69-74
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• 2000

The bandwidth of microstrip slot antenna with T-shaped feed line was a wider than one of the conventional feeding structure. When the slot antenna with bi-directional radiator wants to radiate only one direction, the reflector must be set up seperately. But this antenna doesn't need set up reflector. And then we proposed to a new method of a directional slot radiator with a cross-shaped feedline including the reflector using 2-layers dielectric materials. It is calculated waves and electric field distribution in the time domain by using FDTD method. We also are calculated return loss, VSWR, input impedance, and radiation pattern in the frequency domain by Fourier transforming the time domain results, respectively. It was found that the bandwidth of this antenna changes as length($\I_s$) and width($\W_s$) of slot, length of the horizontal feedline($\I_d$), length of the vertical feedline($\I_u$) and offset sensitively. After optimizing the parameters of design, the maximum bandwidth was measured as 1,850MHz at the center frequency 2.5 GHz.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2002.11a
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• pp.285-289
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• 2002

In this paper, microstrip line-probe feeding patch array antenna with center frequency 5.8㎓ is designed and manufactured. The microstrip line - probe feeding structure has broadband characteristic and be able to modify the array structure for improving antenna gain. In this result, microstrip line-probe feeding patch array antenna has 17.6% bandwidth and 8㏈i antenna gain, respectively.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.2
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• pp.212-216
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• 2004

In this paper, a new design for a Coplanar Waveguide(CPW) fed wide-band slot antenna is presented. To enhance the impedance bandwidth of the slot antenna, we proposed the tapering slot structure. A various resonance modes are generated in the tapering slot. The measured impedance bandwidth of the proposed antenna is about 13:1(2.0 GHz∼25.9 GHz) with VSWR$\leq$2. Simulation and measurement results for return loss and radiation pattern are presented.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.9
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• pp.775-782
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• 2016

In this paper, we propose a dual-band GPS antenna using a single-layer coupled-feed structure for improvement of isolation and design complexity. The proposed antenna consists of a central feed patch and outer dual loops, and the loops are electromagnetically fed by the feed patch to induce currents. This feeding network can improve the isolation between antenna elements arranged in small arrays because the magnetic field strength near the antenna is minimized by confining the fields around the dual loops. The isolation characteristics of the proposed antenna are compared with those of the conventional multi-layer patch antenna, and the average field strength and the isolation are improved by 3 dB and 2 dB, respectively, which verifies that the antenna is suitable for small CRPA arrays.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.6
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• pp.882-889
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• 2001

In this paper, the characteristics of u-slot antennas are computed by changing the feed structure, and compared with the measured results. The impedance bandwidths of 13 %(255.1 MHz) and 30.7 %(602.1 MHz) are obtained for probe feed and L-strip feed, respectively. It is known that the designed L-strip feed can be used for increasing the bandwidth of u-slot antennas. In addition, it is shown that the designed L-strip feed u-slot antenna can be used for domestic PCS and IMT-2000 dual band applications.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2000.11a
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• pp.394-398
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• 2000

프로브로 급전되는 패치 안테나의 경우 급전점에서 급격히 변하는 전류 성분들이 존재하게 되는데, 이러한 성분들은 패치와 프로브간의 연속성을 보장해 줄 수 있는 attachment mode를 사용하여 정확하게 표현될 수 있다. 본 논문은 프로브 급전 구조를 정확하게 모델링할 수 있는 attachment mode를 사용하여 Radome이 올려진 원형 마이크 로스트립 안테나를 해석하여 임피던스, 반사계수, 및 이득 변화의 영향을 분석하였다.