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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Korean Institute of Electromagnetic Engineering and Science
Journal Basic Information
Journal DOI :
The Korean Institute of Electromagnetic Engineering and Science
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Volume & Issues
Volume 19, Issue 12 - Dec 2008
Volume 19, Issue 11 - Nov 2008
Volume 19, Issue 10 - Oct 2008
Volume 19, Issue 9 - Sep 2008
Volume 19, Issue 8 - Aug 2008
Volume 19, Issue 7 - Jul 2008
Volume 19, Issue 6 - Jun 2008
Volume 19, Issue 5 - May 2008
Volume 19, Issue 4 - Apr 2008
Volume 19, Issue 3 - Mar 2008
Volume 19, Issue 2 - Feb 2008
Volume 19, Issue 1 - Jan 2008
Selecting the target year
A Study on Wideband LC Oscillator Using Fat Dipole Antenna
Lee, Sang-Heun ; Yoon, Young-Joong ; Heo, Hoon ; Nam, Sang-Hoon ; Lee, Woo-Sang ; Choi, Do-Won ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1185~1192
DOI : 10.5515/KJKIEES.2008.19.11.1185
In this paper, a wideband LC oscillator which is composed of a high voltage switch and a fat dipole antenna was designed and radiation characteristics are analyzed. A Marx generator was used as a high voltage pulse generator of the proposed wideband LC oscillator and
corner reflector was used to obtain high directivity. According to simulated and measured results, 3 dB bandwidth of high voltage switch without fat dipole based on the received power is about 9%(
) and bandwidth Is about 30%(
) by using the LC oscillator containing high voltage switch and fat dipole. Consequently, fat dipole affects not only radiating power but also operating frequency and bandwidth of the LC oscillator. This study will be useful to determine operating frequency and radiating power when we design LC oscillator which uses a high voltage switch and a fat dipole.
Design of a Highly Linear Broadband Active Antenna Using a Multi-Stage Amplifier
Lee, Cheol-Soo ; Jung, Geoun-Seok ; Pack, Jeong-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1193~1203
DOI : 10.5515/KJKIEES.2008.19.11.1193
An active antenna(AA) can have wider bandwidth and more gain with small antenna size than those of passive antennas. However, AA inherently generates thermal noise and spurious signals from an active device. Moreover, the spurious performance of AA is very important in a highly sensitive receiving system since it is located at the front end of the receiving system. In this study, we developed an AA with
, having the output P1dB higher than 3 dBm and little spurious signals in real environments. To achieve such performance, we designed an AA with 3-stage amplifier using CD(common drain) FET and 2 BJTs. Its electrical performances were simulated using ADS. The measurement results for typical gain, NF, OIP3, VSWR and P1dB in the required frequency band were 9.7 dBi, 10 dB, 14 dBm, 1.7:1 and 3 dBm respectively. They are in good agreement with simulation results. The unwanted spectrum level of the proposed AA is
lower than that of the antenna with CS(common source) FET configuration at a west suburban area of Seoul, which shows that the proposed AA can be applicable to a highly sensitive receiving system for detecting unknown weak signals mixed with broadcasting and civilian communication signals.
Detection of Heartbeat and Respiration Using a Modified Signal Model in the CW Bio-Radar
Seo, Myung-Hwan ; Lee, Byung-Seub ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1204~1212
DOI : 10.5515/KJKIEES.2008.19.11.1204
The paper proposes a new signal model which is revised from the commonly used signal model. Recently, many research institutions had a research about CW bio-radar for detecting he heartbeat and respiration. However, when the bio-radar detects the heartbeat using the previous signal model, the bio-radar has a disadvantage of weakness about he residual phase and AWGN. Also, the model is inappropriate in ergonomics because this signal model supposes hat the heart and lung are located at a same place. In this paper, the modified signal model, which is appropriate n ergonomics, is proposed. This paper analyzes and compares with the performance for detecting the heartbeat and respiration using the previous model and revised model in AWGN and multi-path environment.
Analysis of Radiation Characteristics of Plate-Inserted IBBD Array Antennas
Choi, Hwan-Gi ; Choi, Hak-Keun ; Kim, Do-Kyung ; Jung, Young-Bae ; Jeon, Soon-Ik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1213~1222
DOI : 10.5515/KJKIEES.2008.19.11.1213
In this paper, the isolation of the IBBD array antenna is analyzed as functions of the element spacing and the height of the flat plate inserted between array elements for the intelligent antenna system. It is found that the isolation between array elements improves with increasing the array spacing. The array configuration with the plate between the elements is enhanced by about 13 dB more In the isolation than the one without the plate. The plate-inserted
elements IBBD array antennas are fabricated and the radiation characteristics are measured and analyzed for the various heights of the plate. It is found that the gain decreases slightly with increasing the height of plate but the shape of radiation pattern does not show a remarkable change.
A Study on the Efficient Extraction of Slot Admittance for the Design of a Non-Resonant Waveguide Edge Slot Array
Park, Jong-Kuk ; Han, Ki-Jin ; Na, Hyung-Gi ; Kim, Chan-Hong ; Lee, Dong-Kook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1223~1232
DOI : 10.5515/KJKIEES.2008.19.11.1223
In this paper, an analytic method is proposed to extract the reference slot admittance required for the design of a non-resonant waveguide edge slot array. A slot and two neighboring transmission line sections of the numerous alternately inclined slots with the identical inclination angle are modelled as a uniform lossy transmission line, and thus, the total ABCD matrix is easily calculated and compared with the simulated or measured one. From this procedure, the complex characteristic impedance and the complex propagation constant of the lossy transmission line are calculated and the normalized slot admittance is analytically obtained. In order to validate the proposed method, the admittance value of a reference slotted waveguide fabricated for designing the X-band edge slot array is extracted and it is compared with the one obtained by the other conventional method.
Analysis of Multi-Current Distributed Broadband Printed Monopole Antenna
Jeon, Sung-Keun ; Kim, Nam ; Lee, Seung-Woo ; Rhee, Seung-Yeup ; Park, Ji-Chang ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1233~1239
DOI : 10.5515/KJKIEES.2008.19.11.1233
In this paper we proposed a novel broadband printed monopole antenna for PCS/IMT-2000/WLAN terminals by widening current flow To compensate narrow bandwidth characteristics which is one of disadvantages of general printed monopole antenna, we add the patch of diamond shape and induce the current in various directions for acquiring broadband characteristics. And frequency characteristics is optimized with Various design parameters. The bandwidth of the realized antenna is
(58.72 %) below the return loss of -10 dB which contain the required band-width of PCS/IMT-2000/WLAN band.
Twisted Inverted F Antenna for Dual-Band Applications
Kim, Jae-Hee ; Jo, Won-Woo ; Park, Wee-Sang ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1240~1247
DOI : 10.5515/KJKIEES.2008.19.11.1240
A twisted inverted-F antenna(TIFA) is proposed for a dual-band application. The TIFA features a twisted line for dual bands and a parasitic line for additional resonance. The proposed antenna has wideband characteristics at the high frequency band due to the merge of the resonances of the twisted line and the parasitic line. The electric size of the antenna is
, whose length is about 44% of that of a conventional inverted-F antenna. The fabricated antenna on a thin FR4 substrate was measured to operate at 960 MHz with a bandwidth of 47 MHz, and at 1.8 GHz with a bandwidth of 289 MHz for
less than -5 dB; the radiation efficiencies were 49% and 57%, respectively.
Stepped Impedance LPF Using MCS Line with Ground
Rhee, Seung-Yeop ; Lee, Yong-Kook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1248~1253
DOI : 10.5515/KJKIEES.2008.19.11.1248
The MCS(Micro-Coplanar Strip) line with ground has been analyzed. The conformal mapping method is used to calculate the quasi-static effective dielectric constant and characteristic impedance of this MCS line. The computed results of the present work are found to be in good agreement when compared with the results obtained using commercial S/W, IE3D. And in this paper, the stepped-impedance low pass filter is designed and fabricated with MCS lines for improving the frequency responses. The LPF proposed structure has been also designed and implemented to have the sharp attenuation characteristics in stop band. The agreement between simulation and measurement results verify the implemented LPF.
Modeling and Digital Predistortion Design of RF Power Amplifier Using Extended Memory Polynomial
Lee, Young-Sup ; Ku, Hyun-Chul ; Kim, Jeong-Hwi ; Ryoo, Kyoo-Tae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1254~1264
DOI : 10.5515/KJKIEES.2008.19.11.1254
This paper suggests an extended memory polynomial model that improves accuracy in modeling memory effects of RF power amplifiers(PAs), and verifies effectiveness of the suggested method. The extended memory polynomial model includes cross-terms that are products of input terms that have different delay values to improve the limited accuracy of basic memory polynomial model that includes the diagonal terms of Volterra kernels. The complexity of the memoryless model, memory polynomial model, and the suggested model are compared. The extended memory polynomial model is represented with a matrix equation, and the Volterra kernels are extracted using least square method. In addition, the structure of digital predistorter and digital signal processing(DSP) algorithm based on the suggested model and indirect learning method are proposed to implement a digital predistortion linearization. To verify the suggested model, the predicted output of the model is compared with the measured output for a 10W GaN HEMT RF PA and 30 W LDMOS RF PA using 2.3 GHz WiBro input signal, and adjacent-channel power ratio(ACPR) performance with the proposed digital predistortion is measured. The proposed model increases model accuracy for the PAs, and improves the linearization performance by reducing ACPR.
Radiation Efficiency Improvement of RFID Tag Antenna for Metallic Objects Printed on Lossy Substrate
Son, Hae-Won ; Choi, Won-Kyu ; Choi, Gil-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1265~1271
DOI : 10.5515/KJKIEES.2008.19.11.1265
In this paper, we propose a new antenna design method for RFID tass on metallic surfaces using a low-cost, high-loss substrate such as FR4. The proposed design method highly reduces the substrate loss due to its dielectric loss, and so improves the radiation efficiency of the tag antenna more than double compared with a conventional PIFA(planar inverted-F antenna). The equivalent circuit model of the antenna according to the proposed method was established and its characteristics were analyzed systematically in this paper. The excellency of the proposed design method was verified by the fabrication and measurement of a prototype antenna.
Analysis of Phase Noise in Frequency Synthesizer with DDS Driven PLL Architecture
Kwon, Kun-Sup ; Lee, Sung-Jae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1272~1280
DOI : 10.5515/KJKIEES.2008.19.11.1272
In this paper, we have proposed a phase noise model of fast frequency hopping synthesizer with DDS Driven PLL architecture. To accurately model the phase noise contribution of noise sources in frequency hopping synthesizer, they were investigated using model of digital divider for PLL, DAC for DDS and Leeson's model for reference oscillator and VCO. Especially it was proposed that the noise component of low pass filter was considered together with the phase noise of VCO. Under assuming linear operation of a phase locked loop, the phase noise transfer functions from noise sources to the output of synthesizer was analyzed by superposition theory. The proposed phase noise prediction model was evaluated and its results were compared with measured data.
Analysis of PSK Coherent Carrier Signal Recovery Circuit Using Six-Port Phase Correlator
Kim, Young-Wan ; Shin, Choo-Yeon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1281~1286
DOI : 10.5515/KJKIEES.2008.19.11.1281
The PSK carrier signal recovery circuit using a six-port phase correlator was analyzed and the circuit structure is proposed in this paper. The proposed carrier signal recovery circuit that is made of reflection element and six-port phase correlator, which is comprised of a power divider and three hybrid branch line couplers, give a simple structure and can be fabricated without no difficulty. The circuit recovers the carrier signal of BPSK and QPSK modulation signal. The proposed scheme can be utilized as a basis structure for high-mode PSK carrier signal recovery. By simulation results, the recovered signal by the proposed circuit shows a good carrier signal characteristic with CW signal of a constant phase(
phase error due to glitch conditions.
Quad-Band Antenna Switch Module with Integrated Passive Device and Transistor Switch
Jeong, In-Ho ; Shin, Won-Chul ; Hong, Chang-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1287~1293
DOI : 10.5515/KJKIEES.2008.19.11.1287
Antenna switch module(ASM) for quad-band was developed. This module was integrated by RFIPD(RF integrated passive device) and transistor switch instead of LTCC-type device using low pass filters, diodes and passive elements in RF front end module for cellular phone. This module leads to low cost and miniaturization(The area is
and the thickness is 0.8 mm). The insertion loss and the return loss of each band were averagely measured as 1.0 dB(insertion loss), 15.1 dB(GSM/EGSM return loss) and 19 dB(DCS/PCS return loss), respectively.
Design of the Dual Linear Polarized Radiation Element Using a Open-Ended Ridge Waveguide
Ko, Ji-Whan ; Chun, Jong-Hoon ; Cho, Young-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 11, 2008, Pages 1294~1302
DOI : 10.5515/KJKIEES.2008.19.11.1294
A design approach for a radiation element of dual polarization, which can be implemented in the waveguide structure, is proposed. For minimization of the radiating element, the ridged waveguide type is used and for dual polarization, the microstrip type of printed dipole structure is additionally installed inside the waveguide. In order to validate the design approach,
array antenna is fabricated and its performances such as return loss, co-polarization coupling between adjacent channels, and radiation patterns are investigated. Theory and experiment are observed to be in good agreement. The radiating structure is thought to be a useful one in an application to the phased array antenna system, in particular, requiring dual polarization characteristics.