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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
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Journal DOI :
The Korean Institute of Electromagnetic Engineering and Science
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Volume & Issues
Volume 21, Issue 12 - Dec 2010
Volume 21, Issue 11 - Nov 2010
Volume 21, Issue 10 - Oct 2010
Volume 21, Issue 9 - Sep 2010
Volume 21, Issue 8 - Aug 2010
Volume 21, Issue 7 - Jul 2010
Volume 21, Issue 6 - Jun 2010
Volume 21, Issue 5 - May 2010
Volume 21, Issue 4 - Apr 2010
Volume 21, Issue 3 - Mar 2010
Volume 21, Issue 2 - Feb 2010
Volume 21, Issue 1 - Jan 2010
Selecting the target year
A Study on the Improvement of PIMD in the Mobile Communication Base Station Antenna
Seo, Chang-Jae ; Cheon, Chang-Yul ; Chung, Young-Seek ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1201~1207
DOI : 10.5515/KJKIEES.2010.21.11.1201
As the mobile services have been increased, the PIMD(Passive Inter-Modulation Distortion) as well as the active-IMD of the CDMA system should be considered for the design of base station antenna systems, because they have an interference of the neighboring base stations. In this paper, in order to reduce the nonlinearity of current caused by the local point contact, we have investigated an influence of the combination of nuts, contact torque(kgf.cm), and the contact area on the PIMD. We propose the improvement techniques of PIMD by investigating the effects of the distance of nuts, the contact area, and the type of nuts.
A Slotted Square-Patch Type Balun-BPF
Oh, Song-Yi ; Hwang, Hee-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1208~1213
DOI : 10.5515/KJKIEES.2010.21.11.1208
In this paper, a microstrip balun-BPF of slotted-square-patch type is proposed. The conventional balun-BPF has some drawbacks of narrow bandwidth and high insertion loss. In order to improve these weak points, we used a square patch in designing balun-BPF on which two slots intersecting perpendicularly and one corner-edge perturbation are adopted. This structure allows one of the most effective use of the patch space so that the insertion loss can be decreased. Changing the slot lengths is use to control the operating frequency and the bandwidth of the balun-BPF. A fabricated balun-BPF shows wide bandwidth of 300 MHz(12.7 %), small insertion loss of 0.56 dB, phase difference of
and amplitude imbalances of within 1 dB between two output ports at 2.4 GHz band.
Implementation of Software Radio System for IEEE 802.15.4 Physical Layer Using USRP and GNU Radio
Park, Dae-Hyeon ; Kim, Young-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1214~1219
DOI : 10.5515/KJKIEES.2010.21.11.1214
In this paper, a software radio system, supporting the physical layer of IEEE 802.15.4 standard, has been developed using USRP(Universal Software Radio Peripheral) board and GNU Radio package of an open source development kit for software radio. The software radio system supports the standards of BPSK and OQPSK modulations for 868/915 MHz band and OQPSK modulation for 2.45 GHz band. To verify the operation of the developed system, it has been tested under the standard signals according to the frequency band and packet structures for the transmitting and receiving operation. At 2.4 GHz, the Smart RF EV board and CC2430 modules are used to check the proper operation of the software radio system. The system performance test shows that the emission power spectrum, the eye-pattern, and PER(Packet Error Rate) meet the standard. It has been confirmed that the developed system supports the PHY layer of IEEE 802.15.4.
A Study on Efficient Polynomial-Based Discrete Behavioral Modeling Scheme for Nonlinear RF Power Amplifier
Kim, Dae-Geun ; Ku, Hyun-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1220~1228
DOI : 10.5515/KJKIEES.2010.21.11.1220
In this paper, we suggest a scheme to develop an efficient discrete nonlinear model based on polynomial structure for a RF power amplifier(PA). We describe a procedure to extract a discrete nonlinear model such as Taylor series or memory polynomial by sampling the input and output signal of RF PA. The performance of the model is analyzed varying the model parameters such as sample rate, nonlinear order, and memory depth. The results show that the relative error of the model is converged if the parameters are larger than specific values. We suggest an efficient modeling scheme considering complexity of the discrete model depending on the values of the model parameters. Modeling efficiency index(MEI) is defined, and it is used to extract optimum values for the model parameters. The suggested scheme is applied to discrete modeling of various RF PAs with various input signals such as WCDMA, WiBro, etc. The suggested scheme can be applied to the efficient design of digital predistorter for the wideband transmitter.
Analysis of Hybrid ARQ System Using Cross Layer
Park, Tae-Doo ; Kim, Min-Hyuk ; Kim, Chul-Seong ; Jung, Ji-Won ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1229~1234
DOI : 10.5515/KJKIEES.2010.21.11.1229
High quality and high speed multimedia services will be required in the next generation mobile communications. To satisfy these services, powerful error correction techniques are used. ARQ(Auto Repeat Request) techniques, aspects of the throughput, and FEC(Forward Error Correct) techniques have disadvantages in terms of reliability. H-ARQ(Hybrid Auto Repeat Request) systems have been studied extensively as a solution of these disadvantages. In this paper introduce double layer coding and H-ARQ type, proposed H-ARQ system using double layer coding methods. Simulate BER performance and throughput. And we suggest that according to channel condition suitable H-ARQ type.
A 24-GHz Wide-IF Down-Conversion Mixer Based on 0.13-μm RFCMOS Technology
Kim, Dong-Hyun ; Rieh, Jae-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1235~1239
DOI : 10.5515/KJKIEES.2010.21.11.1235
In this work, a wideband technique has been proposed that improves the IF bandwidth of mixers and a 24-GHz down-conversion mixer employing the proposed technique has been designed and fabricated based on 0.13-
RFCMOS technology. The mixer showed the conversion gain of
dB from DC to 5.25 GHz IF for a fixed LO frequency of 24 GHz. Measured P-1dB and LO-RF isolation was -8.7 dBm and 21 dB, respectively. The mixer draws DC current of 10.6 mA from 1.3 V supply.
A Study on the Electrical Design of a Multi-Beam Large Antenna for S-band Satellite Payload
Yun, So-Heyun ; Uhm, Man-Suk ; Yom, In-Bok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1240~1247
DOI : 10.5515/KJKIEES.2010.21.11.1240
This paper describes the study on the electrical design of a multi-beam large antenna for a satellite payload. This satellite antenna provides the universal communication and broadcasting services to personal portable terminals over the Korean Peninsula. The structure of the hybrid antenna fed by a feed array is proper to provide multi-beams. The amplitude and phase of each feed element should be optimized for a required beam and they can be obtained by GO (Geometrical Optics) and PO(Physical Optics) method. The number of feed elements are also optimized to meet the specification of EIRP(Effective Isotropically Radiated Power). The optimally designed antenna with the limited reflector size and minimum number of feed elements is shown in this paper.
Design of Series-Fed Microstrip Patch Array Antennas for Monopulse Radar Sensor Applications
Park, Eui-Joon ; Jung, Ik-Soo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1248~1258
DOI : 10.5515/KJKIEES.2010.21.11.1248
In this paper, a method for simultaneously realizing the sum and difference patterns which are required in the monopulse radar sensor systems, is presented by using single taper array antenna with rectangular microstrip patches. The widths of patches are first determined by the voltage weights which are synthesized for the fundamental array factor patterns to be applied to the monopulse operation by using the sidelobe levels(SLLs) control technique. As the bi-directionally series-fed technique is applied and the lengths of connecting lines between patches are appropriately adjusted, the single array generates two phase-shifted beams which activates out-of-phase and in-phase ports of a
hybrid coupler to synthesize the sum and difference patterns. The simulated results on the configuration designed at 9.5 GHz are compared with measured results showing the validity of the proposed method.
A Filter Synthesis Method for Multi-Band Filter Design
Lee, Hye-Sun ; Lee, Ja-Hyeon ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1259~1268
DOI : 10.5515/KJKIEES.2010.21.11.1259
In this paper, we presented a new LC prototype synthesis method for the multi-band filter. For synthesis a multi-band filter with the required frequency response, we proposed the diagram of poles and zeros, also, we proposed the optimization process for finding the combination of optimized poles and zeros. From the transfer and reflection functions calculated from poles and zeros, we performed the quasi-elliptic LC prototype synthesis of multi-band filter. Using the proposed LC prototype synthesis method of multi-band filter, dual-band filter operating at GSM(880~960 MHz) and ISM(2,400~2,500 MHz) and triple-band filter operating at GSM(880~960 MHz) and ISM(2,400~2,500, 5,725~5,850 MHz) were designed and fabricated.
Performance of MIMO-OFDM System with Linear Pre-Equalization over Fading Channel
Bae, Jung-Nam ; Park, Woo-Chul ; Kim, Jin-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1269~1274
DOI : 10.5515/KJKIEES.2010.21.11.1269
Wireless communication channels with the most severe multipath fading phenomenon that appears each time a different delay is caused by the frequency selective fading. At this time, ISI due to the performance degradation of wireless communication channels and data transfer speed gives the constraints. OFDM technique can remove ISI inserting longer guard interval than channel delay spread of channel between symbol. However, the multi-path delay of the channel to be serious with the guard interval can not eliminate ISI. In this case, using the equalizer must compensate. Especially, use of equalizer is need absolutely as data rate becomes high speed. In this paper, we analyze the BER performance with pre-equalization for MIMO-OFDM over fading channel. The results of this paper can be applied to MIMO-OFDM system with equalization.
Influences and Compensation of Phase Noise and IQ Imbalance in Multiband DFT-S OFDM System for the Spectrum Aggregation
Ryu, Sang-Burm ; Ryu, Heung-Gyoon ; Choi, Jin-Kyu ; Kim, Jin-Up ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1275~1284
DOI : 10.5515/KJKIEES.2010.21.11.1275
100 MHz bandwidth and 1 Gbit/s data speed are needed in LTE-advanced for the next generation mobile communication system. Therefore, spectrum aggregation method has been studied recently to extend usable frequency bands. Also bandwidth utilization is increased since vacant frequencies are used to communicate. However, transceiver structure requires the digital RF and SDR. Therefore, frequency synthesizer and PA must operate over wide-bandwidth and RF impairments also increases in transceiver. Uplink of LTE advanced uses DFT-S OFDM using plural power amplifier. The effect of ICI increases in frequency domain of receiver due to phase noise and IQ imbalance. In this paper, we analyze influences of ICI in frequency domain of receiver considering phase noise and IQ imbalance in multiband system. Also, we separate phase noise and IQ imbalance effect from channel response in frequency domain of uplink system. And we propose a method to estimate the channel exactly and to compensate IQ imbalance and phase noise. Simulation result shows that the proposed method achieves the 2 dB performance gain of BER=
Feasibility Study of Forward-Looking Imaging Radar Applicable to an Unmanned Ground Vehicle
Sun, Sun-Gu ; Cho, Byung-Lae ; Park, Gyu-Churl ; Nam, Sang-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1285~1294
DOI : 10.5515/KJKIEES.2010.21.11.1285
This study describes the design and verification of short range UWB(Ultra Wideband) imaging radar that is able to display high resolution radar image for front area of a UGV(Unmanned Ground Vehicle). This radar can help a UGV to navigate autonomously as it detects and avoids obstacles through foliage. We describe the relationship between bandwidth of transmitting signal and range resolution. A vivaldi antenna is designed and it's radiation pattern and reflection are measured. It is easy to make array antenna because of small size and thin shape. Aperture size of receiving array antenna is determined by azimuth resolution of radar image. The relation of interval of receiving antenna array, image resolution and aliasing of target on a radar image is analyzed. A vector network analyzer is used to obtain the reflected signal and corner reflectors as targets are positioned at grass field. Applicability of the proposed radar to UGV is proved by analysis of image resolution and penetrating capability for grass in the experiment.
An Effective Method for Selection of WGN Band in Man Made Noise(MMN) Environment
Shin, Seung-Min ; Kim, Young-Soo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1295~1303
DOI : 10.5515/KJKIEES.2010.21.11.1295
In this paper, an effective method has been proposed for selection of white Gaussian noise(WGN) band for radio background noise measurement system under broad band noise environment. MMN which comes from industrial devices and equipment mostly happens in the shape of broad band noise mostly like impulsive noise and this is the main reason for increasing level in the present radio noise measurements. The existing method based on singular value decomposition has weak point that it cannot give good performance for the broad band signal because it uses signal's white property. The proposed method overcomes such a weakness of singular value decomposition based method by using signal's Gaussian property based method in parallel. Moreover, this proposed method hires a modelling based method which uses parameter estimation algorithm like maximum likelihood estimation(MLE) and gives more accurate result than the method using amplitude probability distribution(APD) graph. Experiment results under the natural environment has done to verify feasibility of the proposed method.
Design of K-Band Radar Transceiver for Tracking High Speed Targets
Sun, Sun-Gu ; Lee, Jung-Soo ; Cho, Byung-Lae ; Lee, Jong-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1304~1310
DOI : 10.5515/KJKIEES.2010.21.11.1304
This study is to design FMCW radar transceiver of K-band which is used to detect and track approaching high speed targets with low altitude. The transmitter needs high output power due to small RCS targets and wide beamwidth of transmit antenna. Multi-channel receivers are required to detect and track targets by interferometer method. Transmitter consists of high power amplifier, waveguide switch, and frequency up-converter. Receiver is composed of five channel receivers, up and down converters, X-band local oscillator and waveform generator. Before manufacturing it, the proposed architecture of transceiver is proved by modeling and simulation using several parameters. Then, it is manufactured by using industrial RF components. The performance parameters are measured through experiment. In the experiment, transmitting power and receiver gain were measured with 39.64 dBm and 29.1 dB, respectively. All other parameters in the specification were satisfied as well.
Radio Resource Management Algorithm for Uplink Coordinated Cooperative Spatial Multiplexing
Mun, Cheol ; Jo, Han-Shin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1311~1317
DOI : 10.5515/KJKIEES.2010.21.11.1311
In this paper, for a uplink space division multiple access system named cooperative spatial multiplexing(CSM), radio resource management(RRM) algorithms are proposed based on sharing uplink channel information among a serving base station(BS) and interfering BSs in a uplink coordinated wireless communication system. A constrained maximum transmit power algorithm is proposed for mobile station(MS) to limit uplink inter-cell interference(ICI). And joint scheduling algorithm among coordinated BSs is proposed to enhance uplink capacity through ICI mitigation by using channel information from interfering BSs. It is shown that the proposed RRM algorithm provides a considerable uplink capacity enhancement by effective ICI mitigation only with moderate complexity.
Down Conversion Mixer for Millimeter Band
Ji, Hong-Gu ; Oh, Seung-Hyeub ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1318~1323
DOI : 10.5515/KJKIEES.2010.21.11.1318
A lot of demand for parts of millimeter wave band, as would be expected 57~63 GHz band down conversion mixer was designed and fabricated using IHP 0.25 um SiGe process. Designed and fabricated mixer was double balanced type and located reduced 3D balun at RF port and buffer amplifier at outport for suppression LO signal and conversion gain. Fabricated mixer measured conversion gain of 13.8 dB,
-17 dBm and 88 mA of current consumption characteristics, respectively.
An Analysis on the Properties of Beam Coupling by Using Gaussian Beam Propagation Theory
Han, Seog-Tae ; Kang, Jin-Man ; Lee, Jeong-Won ; Je, Do-Hyung ; Jung, Moon-Hee ; Kim, Soo-Yeon ; Wi, Seog-Oh ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 11, 2010, Pages 1324~1333
DOI : 10.5515/KJKIEES.2010.21.11.1324
In this paper, three kinds of beam coupling losses which occur in a quasi-optics circuit for millimeter wave receiver system have been intensively investigated. First, the beam coupling losses which are caused by mismatch of beam waists radii and their positions between those of one and the other have been evaluated. It shows that beam coupling losses due to mismatch of beam waists radii and their positions between two quasi-optics circuits can be minimized if beam waist radius is chosen as larger than 3 times the operation wavelength. Second, the beam coupling losses have been studied when the axis of propagation of one beam is tilted with respect to that of the other beam. It is noted that smaller beam waist radius results in greater tolerance to tilts and angular misalignments. Third, the beam coupling cases in which two beams are offset if their axes of propagation are parallel but one is displaced relative to the other have been investigated. It is confirmed that beam waists radii with larger than 3 times operation wavelength are less sensitive to lateral offsets.