• Title, Summary, Keyword: Tapered microstrip

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A Compact Feeding Structure for an Wide-band Array Antenna using a Microstrip Metamatreial UWB Power Divider (메타재질구조의 UWB 전력 분배기를 이용한 광대역 배열 안테나를 위한 급전부 설계)

  • Eom, Da-Jeong;Kahng, Sung-Tek;Park, Jeong-Hoon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.8
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    • pp.1159-1163
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    • 2012
  • In this paper, a new method is suggested to reduce the size of a wide-band array antenna. The power-divider for the feeding structure is made compact as ${\lambda}/8$ with the help of a novel Metamaterial UWB bandpass filter. This power divider is clearly different from others in that the proposed design uses microstrip structured Composite Right and Left-Handed (CRLH) filters, while others use two dielectric layers or long tapered transmission lines. In order to validate the proposed design method, the circuit and full-wave simulated results of the power divider with the Metamaterial UWB filters are compared to each other, and the Metamaterial properties of the structure are shown with the electric field at the ZOR and dispersion diagram. Furthermore, the antenna performance of the fabricated antenna with the power divider is measured and compared with the prediction. Also, the size reduction effect by the proposed scheme is addressed.

UHF Cavity-backed Spiral Antenna for Partial Discharge Diagnosis (부분방전 진단용 UHF cavity-backed 스파이럴 안테나)

  • Kim, Han Byul;Kim, Jin Hyuk;Hwang, Keum Cheol;Shin, Jae Ho
    • Journal of the Institute of Electronics and Information Engineers
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    • v.49 no.12
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    • pp.89-94
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    • 2012
  • In this paper, a UHF cavity-backed spiral antenna for partial discharge diagnosis is proposed. The proposed antenna consists of two-arm Archimedean spiral, a cavity, and a balun for feeding. The spiral antenna is designed for 0.3-1.5 GHz operating frequency. Two spiral arms of the proposed antenna are fed by a microstrip tapered-balun. In order to enhance the gain, the cavity is located in the back side of the spiral pattern. The proposed antenna is designed and simulated using CST Microwave Studio. The designed antenna is also fabricated and tested to validate performance. The measured radiation patterns are directional to the +z-axis and measured peak gain is 9.92 dBi.

Satellite Communication Microstrip 8X2 Away Antenna for TX / RX Dual Operation at Ku-band (Ku 대역 위성통신 송수신 겸용 마이크로스트립 8X2 배열 안테나)

  • 윤재승;전순익;최재익;채종석
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.6
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    • pp.574-581
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    • 2002
  • Microstrip $8{ imes}2$ sub-array antennas for a extension to active phased array antennas are designed, fabricated and measured for TX/RX dual operation in satellite communication and a reception of satellite broadcasting. For the frequency range from 11.7 to 12.75 GHz for RX and from 14 to 14.5 GHz for TX, two orthogonal linear polarizations of ${pm}45^{\circ}$ are used to transmit and receive simultaneously with one radiator. They adopt dual resonance between two patches for wideband characteristics in RX band and show isolation characteristics over 20 dB. An electrical beam tilt of $30^{\circ}$ is achieved and a tapered power distribution, narrow element spacing are used for the purpose of low side-lobe characteristics.

Design and Fabrication of a Dual Polarized Load-bearing Microstrip Antenna (이중편파 하중 지지형 마이크로스트립 안테나 설계 및 제작)

  • 이라미;이정수;박위상;박현철;황운봉
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.1
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    • pp.125-135
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    • 2001
  • A 8$\times$4 microstrip antenna array is designed at 5.3 GHz and its characteristics are investigated with respect to the application in dual polarized synthetic aperture radars. The design is focused on the achievement of a wide bandwidth, a high polarization purity, a low loss, a good isolation and some mechanical requirements suitable for the application. The antenna is fed by a -3 dB tapered feed network, and is composed of dual polarized SSFIP (Strip-Slot-Foam-Inverted Patch) elements with honeycomb and shielding plane. Simulation results for the antenna array are presented and compared with measurements. It is observed that the antenna shows a bandwidth of 80 MHz, a polarization isolation better than 20 dB, an isolation of 40 dB, and good mechanical characteristics.

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Equivalent Circuit Modeling of Aperture-Coupled Microstrip-to-Vertically Mounted Slotline Coupler (개구면을 통한 마이크로스트립-수직 슬롯 라인 결합 구조의 회로망 해석과 모델링)

  • Nam, Sang-Ho;Kim, Jeoung-Phill
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.4
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    • pp.357-365
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    • 2009
  • A general analysis of a microstrip-to-vertically mounted slotline(VMS) coupler is presented with a view to developing an equivalent circuit, and the efficient evaluation of the related circuit element values. Based on this theory, the effects of frequency and structure parameters such as aperture length and VMS width on the characteristics of the coupler are studied. In order to check the validity of the proposed analysis and design theory, a C-band linearly tapered slot antenna fed by an aperture-coupled back-to-back microstripline-to- VMS coupling structure is optimally designed using a hybrid genetic algorithm. Moreover, the computed characteristics from the network analysis is compared to the measurement and simulation results. The obtained results fully validate the efficiency and accuracy of the proposed network model.

Wideband and Compact Balun with Circular Slot and Stacked Structure (원형 슬롯과 유전체 적층 구조를 적용한 광대역 소형 발룬)

  • Cha, Seung Gook;Park, Chan Ju;Kim, Hyungrak;Yoon, Young Joong
    • Journal of Satellite, Information and Communications
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    • v.12 no.1
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    • pp.132-136
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    • 2017
  • In this paper, expanded lowest operating frequency by adopting circular slot on ground of balun and balance improved balance performances by stacking dielectric layer balun is proposed. Bandwidth of proposed balun is 1~7 GHz, and electrical length is $0.05{\lambda}$ at 1 GHz. In order to check performances of the proposed balun, simple dipole is integrated with the balun and radiation pattern of dipole is measured.

Cavity-Backed Slot Array Antenna for a Repeater System of a Satellite Digital Multimedia Broadcasting (위성 DMB 중계기용 Cavity-Backed슬롯 배열 안테나)

  • Jung Hee-Chul;Lee Hak-Yong;Jung Byungwoon;Kang Gi-Cho;Park Myun-Joo;Lee Byungje
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.4
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    • pp.366-372
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    • 2005
  • This paper presents analysis of a slot array antenna having a low side lobe level and high front-to-back ratio for a repeater system of a satellite DMB(Digital Multimedia Broadcasting) service. Antennas for this repeater system require a high gain and enough isolation to reduce interferences between signals in system. Therefore, it is necessary to suppress a side lobe level and to increase front-to-back ratio. Unlike a structure 134 by lossy microstrip lines, in this work a single cavity-backed slot antenna array using a single waveguide feed is proposed to obtain the reliability for high power handling and high radiation efficiency. The side lobe level and front-to-back ratio are enhanced with tapered array technique and an optimized vertical reflector. The measured side lobe levels in H- and E-plane are under $-33.24\;\cal{dB}$ and $-35.78\;\cal{dB}$, respectively. The front-to-back ratio over $37.84\;\cal{dB}$, and the peak gain of over $17\;\cal{dBi}$ are measured.

A Study on the Improvement of Efficiency and Linearity of Power Amplifier using PBG Structure (PBG 구조를 이용한 전력 증폭기의 효율 및 선형성 개선에 관한 연구)

  • 김병희;박천석
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.7
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    • pp.1182-1190
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    • 2001
  • In this paper, microstrip photonic bandgap (PBG) structure with special perforation patterns etched on the line itself is analyzed and optimized in shape, then used for harmonic tuning of power amplifier. This PBG has an advantage in being fabricated and grounded. The dimension of unit lattice is enlarged vertically, but its input and output line maintain 50 Ω using tapered line. This modification from original structure can lessen possible error in etching PCB. The analysis and design of PBG structure are acquired from using EM simulation. The measured insertion loss of the final structure is 0.3 ∼0.4 dB, and its bandwidth of stopband is 6∼7 GHz. Measured results of improved characteristics by using PBG structure at the output of the power amplifier are 0.72∼0.99 dB in output power, 1.14∼7.8 % in PAE, and 1 dBc in the third IMD.

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A Study on Microstrip Log-Periodic Antenna for Receiving the Direct Broadcasting Satellite(DBS) Signal (위성방송 수신을 위한 대수주기 마이크로스트립 안테나에 대한 연구)

  • Jang, Won-Ho;Jin, Jae-Sun;Lee, Yun-Hyun
    • The Journal of Advanced Navigation Technology
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    • v.7 no.2
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    • pp.101-107
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    • 2003
  • In this study, we provide a single element log-periodic antenna that the feeding networks and array structures are aperture coupled and series dipole array type. We made the antenna for direct receiving the Moogoongwha satellite broadcasting signal. The transmission power was able to feed the patch dipole in series due to lay perpendicularly 8 series patch dipole on tapered slot. The patch dipole radiation pattern which fed in series power, make the main beam direction up $37^{\circ}{\sim}42^{\circ}$ within the BS/CS bandwidth. The main beam gain was measured 9.31~11.03 dBi. Using 32 elements to array the elements properly, we acquire $4{\times}8$ array structure on limited PCB board. As a result, it has been found that the new planar DBS antenna structure have high gain over 10dBi and acceptable elevation angle over 42 degree, and we can apply this result to commercial DBS reception antenna manufacturing.

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