• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.65-67
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• 2015

본 논문에서는 소형 WLAN 안테나에 적용 가능한 안테나 설계를 설계하고 적용 가능성을 검토하였다. 제안된 안테나는 $45mm{\times}45mm$ 크기의 RF4 기판(비유전율 4.4, 두께 1.6 mm, 손실탄젠트 0.025) 위에 $29mm{\times}29mm$ 크기의 마이크로스트립 패치 안테나를 인쇄하여 MoM법으로 계산하였다. 광대역 특성을 얻기 위하여 기판 상부에 위치한 패치 안테나의 대각 모서리를 3.2mm 커팅 처리하고 급전부는 50ohm 임피던스 정합을 위해 안테나 중심축에서 수평 방향으로 5.1mm 위치로 결정하였다. 계산 결과로서 WLAN 사용대역 2.4-2.48GHz을 고려할 때 정재파비가 2 이하인 주파수 대역은 2.365-2.45GHz(85MHz, 3.53%)로 나타났다.

• 한국전자파학회논문지
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• 제23권5호
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• pp.592-597
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• 2012

본 논문에서는 휴대단말기의 Wi-Fi 대역에서 동작하는 소형 칩 안테나를 설계하였다. 제안된 안테나의 소형화를 위해 칩 안테나 하단에 후면 그라운드를 갖도록 설계하였다. 제안된 안테나는 S자 모양 대칭형으로 유전율이 3.5인 LCP(Liquid Crystal Polymer) 위에 설계되었으며, 칩 안테나의 전체 크기는 $6.0mm{\times}2.5mm{\times}1.2mm$를 갖는다. 제작된 안테나는 VSWR=3 이하 기준 300 MHz(fractional bandwidth: 12.2 %, 2.3~2.6 GHz)의 임피던스 대역폭과 peak gain은 1.42 dBi의 특성을 나타냈다. 안테나 설계는 CST Microwave Studio 상용 프로그램을 사용하여 최적화한 후, 설계된 안테나를 제작하고, 네트워크 분석기와 무반향실을 이용하여 측정하였다.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2005년도 종합학술발표회 논문집 Vol.15 No.1
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• pp.221-224
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• 2005

In this paper, We have designed, fabricated and measured a stacked planar antenna for Ultra-Wideband communication. Radiation parts of the antenna have exponential curve and fed by strip feeding network. We have used the HFSS of Ansoft to simulate the antenna. It was designed to work on a substrate Teflon of thickness 1.575mm and relative permittivity 3.2. The proposed antenna covered the entire UWB band( 3.1GHz $\sim$ 10.6GHz ) for S11$\leq$l0dB. Also the proposed antenna show a good characteristics, linear phase, omni -directional pattern lot UWB applications. Besides the measured results have a reasonable agreement with the simulated results.

• 전기학회논문지P
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• 제59권1호
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• pp.24-28
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• 2010

This paper is presented on the antenna design for notepc platform. We present the antenna with combination of electric-magnetic radiator for dual-band Wireless Local Area Network (WLAN) service and a High Speed Downlink Packet Access (HSDPA) service. Due to the limited antenna space in notepc platform, the antennas for various wireless communication service should be located at a very small area. In this paper, the magnetic-type radiator works for high frequency band (1.7 - 2.1 GHz) application and the electric-type radiator works for low frequency band (820 - 960 MHz) application. This combination produces wide-band characteristics in the high frequency band. Simulation and experimental results of input impedance and gain characteristics of the proposed antenna are presented. There are good agreements between the simulated and measured S11 and gain values.

• 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.

• 전기학회논문지
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• 제61권1호
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• pp.110-116
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• 2012

This paper proposes a new diversity antenna which is the base of MIMO, tunable and reconfigurable antennas. The antenna has a small size and high inter-antenna isolation resulting from the compact radiating element comprising a meandered line and an open-loop combined in one limited uniplanar space and a modified T-shaped decoupling structure, respectively. In a WiMAX band, the radiating element and the entire antenna are $0.092{\lambda}$ and $0.2216{\lambda}$ in size, which shows effective size-reduction and the gain and efficiency of the proposed antenna attached to the ground of a handheld device are 3.7dBi and 56% acceptable to the industrial standard.

• 한국전자파학회논문지
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• 제11권8호
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• pp.1355-1362
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• 2000

Microstrip antennas are attractive for many applications because of their compact size, low profile, and light weight. Recently, the demand for the miniaturization of the personal communication equipment has been increasing along with the proliferation of personal communication systems. Thus, the development of small antenna has been highly demanded. In this paper, a new technique to reduce the overall dimension of a microstrip antenna with a locally non-homogeneous substrate configuration is proposed. The miniaturized microstrip antenna for a repeater system in a mobile communication cellular band(824~894 MHz) is designed with the proposed technique, and commercialized with low cost, light weight, and small size. Comparison between simulations, based on Agilent Technologies HFSS software, and measurements are provided. The proposed method will be more attractive for a light-weight, small-size, and low-cost microstrip array design. This paper also presents the bandwidth improvement technique for under-coupled microstrip patch antenna with a tuning stub.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.2055-2057
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• 2004

The Ku band that has been using for the satellite communication and broadcasting would be changed to K/Ka bands. The satellite system requires the antenna structure to fabricate low loss and small antenna that is able to be integrated with other Rf circuits for both Rx and Tx. So we should design it with dual feed antennas at K/Ka bands, high isolation between two different feeds and broadband circular polarization. This paper proposes the LTCC(Low Temperature Co-fired Ceramic) process for integration with other Rf circuits and the Axial mode of the helical antenna to satisfy those requirements.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.331-332
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• 2008

A horn antenna having dual-band and dualpolarization operation is proposed. To implement a small-sized structure providing circular polarizations in the Ka- and K-band, the antenna is designed by using the horn radiator on the basis of a conical helix which is exited by two ports for TX and RX in both ends. Through a design optimization process, a compactdual-band and dual-polarized horn antenna having high gain and high isolation performance was realized.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제53권9호
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• pp.481-487
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• 2004

The Ku band that has been using for the satellite communication and broadcasting would be changed to K/Ka bands. The satellite system requires the antenna structure to fabricate low loss and small antenna that is able to be integrated with other Rf circuits for both Rx and Tx. So we should design it with dual feed antennas at K/Ka bands, high isolation between two different feeds and broadband circular polarization. This paper proposes the LTCC(Low Temperature Co-fired Ceramic) process for integration with other Rf circuits and the Axial mode of the helical antenna to satisfy those requirements.