• 전기학회논문지P
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• 제60권2호
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• pp.53-55
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• 2011

The printed wide band monopole antenna having characteristics of dipole by modified coplanar wave guide(CPW) ground plane is presented. We are called a slot-arm printed monopole antenna and investigated the effect of the surface currents of the radiator on ground plane. The proposed antenna is treated as two asymmetric dipoles with the included angle of $90^{\circ}$ degrees which lie along Z-direction symmetrically. It is observed that the effect of the surface currents on the radiation patterns is similar to that of the corresponding dipole. The length and width of the ground plane correspond the radius and length of the dipole respectively. This approach is also valid to general printed monopole antennas. The simulation impedance bandwidth of the proposed antenna the range of 2.4 to 4.6 [GHz] for a voltage stand wave ratio (VSWR)${\leq}$2 and got pick gain of 6 [dBi]. So the proposed antenna is satisfied the requirement of the industry science medical (ISM) band operation.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.524-527
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• 2003

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 impedance bandwidth of the proposed antenna is about 12:1 ($2.0GHz{\sim}24.3GHz$) with $VSWR{\le}2$. Simulation results for return loss and radiation pattern are presented.

• 한국전자파학회논문지
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• 제15권2호
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• pp.212-216
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• 2004

본 논문에서는 새로운 구조의 CPW 급전 광대역 슬롯 안테나를 제안하였다. 안테나의 슬롯 구조를 비대칭 곡선형 테이퍼 형태로 구현하여 다중 공진 모드를 형성시킴으로써 임피던스 대역폭을 확장시키는 효과를 가져왔다. 제안된 안테나의 측정된 임피던스 대역폭(VSWR$\leq$2)은 약 13:1(2.0 GHz∼25.9 GHz)을 나타내었다. 이는 기존의 CPW 급전 슬롯 안테나의 임피던스 대역폭을 크게 개선한 것이며 모의실험 및 측정된 반사손실과 복사 패턴을 표현하였다.

• Transactions on Electrical and Electronic Materials
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• 제17권1호
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• pp.7-12
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• 2016

This paper proposes a metal contact RF MEMS switch which utilizes a see-saw mechanism to acquire a switching action. The switch was built on a quartz substrate and involves vertical deflection of the beam under an applied actuation voltage of 5.46 volts over a signal line. The see-saw mechanism relieves much of the operation voltage required to actuate the switch. The switch has a stiff beam eliminating any stray mechanical forces. The switch has an excellent isolation of −90.9 dB (compared to − 58 dB in conventional designs ), the insertion of −0.2 dB, and a wide bandwidth of 88 GHz (compared to 40 GHz in conventional design ) making the switch suitable for wide band applications.

• ETRI Journal
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• 제23권1호
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• pp.33-38
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• 2001

A numerical simulation and an experimental implementation of T-shaped microstrip-fed printed slot array antenna are presented in this paper. The proposed antenna with relative permittivity 4.3 and thickness 1.0mm is analyzed by the finite-difference time-domain (FDTD) method. The dependence of design parameters on the bandwidth characteristics is investigated. The measured bandwidth of twin-slot array antenna is from 1.37 GHz to 2.388 GHz, which is approximately 53.9 % for return loss less than or equal to -10 dB. The bandwidth of twin-slot is about 1.06 % larger than that of single-slot antenna. The measured results are in good agreement with the FDTD results.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.147-150
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• 1999

A T-shaped microstripline-fed printed slot array antenna having wide bandwidth, high gain, and narrow bandwidth is presented in this paper. The proposed antenna is analyzed by using the transmission line model method. We fabricated 4$\times$1 microstrip slot array antenna and measured its return loss and radiation pattern. The maximum bandwidth of this array antenna is from 1.43 ㎓ to 2.60 ㎓, which is 58.1% for the VSWR $\leq$ 2.

• 대한전자공학회논문지
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• 제23권1호
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• pp.36-41
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• 1986

A new microwave wideband frequency discdriminator is described, which is based on the theory of transmission line frequency discriminator known as having the widest bandwidth. It has been realized with microstrip lines and slot lines. It is experimentally verified that the discriminator is linear in a 1.6 GHz bandwidth centered at frequency of 3.2 GHz and has return loss of 20dB or more in that bandwidth.

• 한국전자파학회논문지
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• 제17권6호
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• pp.556-561
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• 2006

본 논문에서는 기존의 주파수 reconfigurable 안테나의 협대역 특성을 개선하기 위한 대역폭 확장 특성을 가지는 주파수 reconfigurable 슬롯 안테나가 제안되었다. 제안된 안테나는 주파수 reconfigurable 특성을 가지는 동시에 대역폭을 확장시키기 위하여 넓은 슬롯 및 좁은 슬롯 두 부분으로 구성되어 있다. 삼각형 구조의 넓은 슬롯은 제안된 안테나의 대역폭을 증가시키는 역할을 하며, 좁은 슬롯은 PIN diode를 장착하는 역할을 한다. 제안된 안테나는 PM diode의 동작 상태를 바꿈에 따라 슬롯의 총 길이를 변화시키며, 이로 인해 중심 주파수 조절과 임피던스 정합의 변화를 최소화시킨다.

• 방송공학회논문지
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• 제16권3호
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• pp.483-489
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• 2011

본 논문에서는 광대역, 양호한 복사패턴, 그리고 고이득 특성을 갖는 새로운 안테나를 제안하였다. FDTD(Finite Difference Time Domain) 법을 이용하여 본 안테나를 해석하였으며, 안테나의 파라메타는 최대대역폭을 갖도록 최적화 설계하였다. 측정한 결과, 안테나의 대역폭은 0.839 옥타브(S11${\leq}$-10 dB). 그리고 제안된 안테나의 측정된 교차편파 복사패턴은 -25dB이하의 우수한 특성을 보였다. 안테나의 측정된 반사손실과 복사패턴 특성도 나타내었으며, 측정된 대역폭 특성은 FDTD 결과와 비교적 잘 일치하였다. 제안된 안테나는 MIMO, LAN, 의료기기, 그리고 방송용 시스템에 적용할 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 C
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• pp.1649-1651
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• 2002

Ultra-wide bandwidth (UWB) detection method has been widely used as a front end detection scheme for the ultra-high frequency (UHF) partial discharge (PD) monitoring systems. A broad-band video detector module was developed and characterized for the UHF UWB PD detection systems. The useable bandwidth of the module is more than 2 GHz and it is optimized for 50-ohm systems. The detection sensitivity and dynamic range of the module were characterized by using a known ns-width RF pulses of GHz range. The dynamic range is more than 6-decades and the module can detect pulsed RF signals down to 1 nW. The detector module can eliminate expensive equipment such as high speed oscilloscopes and radio frequency (RF) spectrum analyzers. Therefore, it enables one to use slow speed data acquisition systems for the PD monitoring at the UHF range. The detector module was used to detect real PDs of about <3 pC. The module converts the UWB PD signals into a low-bandwidth video signal with a high signal-to-noise ratio.