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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 22, Issue 12 - Dec 2011
Volume 22, Issue 11 - Nov 2011
Volume 22, Issue 10 - Oct 2011
Volume 22, Issue 9 - Sep 2011
Volume 22, Issue 8 - Aug 2011
Volume 22, Issue 7 - Jul 2011
Volume 22, Issue 6 - Jun 2011
Volume 22, Issue 5 - May 2011
Volume 22, Issue 4 - Apr 2011
Volume 22, Issue 3 - Mar 2011
Volume 22, Issue 2 - Feb 2011
Volume 22, Issue 1 - Jan 2011
Selecting the target year
Development of 3-D Multi-Function Radar High-Speed Real-Time Signal Processor
Roh, Ji-Eun ; Choi, Byung-Gwan ; Lee, Hee-Young ; Yang, Jin-Mo ; Lee, Kwang-Chul ; Lee, Dong-Hwi ; Jung, Rae-Hyung ; Kim, Tae-Hwan ; Lee, Min-Joon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1045~1059
DOI : 10.5515/KJKIEES.2011.22.12.1045
A 3-D multi-function radar(MFR) is a modern radar to provide various target information, such as range, doppler, and angle by performing surveillance, multiple target tracking, and missile guidance. In this paper, we introduced a real-time radar signal processor(RSP), which is a crucial component of MFR with its design, implementation using high-speed multiple DSP, and performance. Additionally, we verified that several advanced signal processing algorithms were well-performed in our RSP, such as MCA-CFAR algorithm for target detection in clutter environment, range and velocity measurement algorithm using discriminator estimation, and noise jammer detection algorithm using local minimum selection.
Design of Current-Mode Class-D 900 MHz RF Power Amplifier Using Inverse Class-F Technology
Kim, Young-Woong ; Lim, Jong-Gyun ; Kang, Won-Shil ; Ku, Hyun-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1060~1068
DOI : 10.5515/KJKIEES.2011.22.12.1060
In this paper, Current-Mode Class-D(CMCD) RF Power Amplifier(PA) is designed and implemented at 900 MHz. Conventional CMCD PA has output parallel resonator to reconstruct a fundamental frequency component of the output signal. However the resonator can be removed by connecting inverse class-F PAs because even-harmonic components can be removed by CMCD PA's push-pull structure. Using load-pull, inverse class-F PA with GaN transistors is designed, and CMCD PA with the inverse class-F PA is implemented. The CMCD PA has 64.5 % drain efficiency, 34.2 dBm output power. Comparing with the drain efficiency of a CMCD PA with parallel resonator, the CMCD with the inverse class-F technology has 13.6 % improved drain efficiency.
A Miniaturized 2.5 GHz 8 W GaN HEMT Power Amplifier Module Using Selectively Anodized Aluminum Oxide Substrate
Jeong, Hae-Chang ; Oh, Hyun-Seok ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1069~1077
DOI : 10.5515/KJKIEES.2011.22.12.1069
In this paper, a design and fabrication of a miniaturized 2.5 GHz 8 W power amplifier using selectively anodized aluminum oxide(SAAO) substrate are presented. The process of SAAO substrate is recently proposed and patented by Wavenics Inc. which uses aluminum as wafer. The selected active device is a commercially available GaN HEMT chip of TriQuint company, which is recently released. The optimum impedances for power amplifier design were extracted using the custom tuning jig composed of tunable passive components. The class-F power amplifier are designed based on EM co-simulation of impedance matching circuit. The matching circuit is realized in SAAO substrate. For integration and matching in the small package module, spiral inductors and single layer capacitors are used. The fabricated power amplifier with
shows the efficiency above 40 % and harmonic suppression above 30 dBc for the second(2nd) and the third(3rd) harmonic at the output power of 8 W.
Minimum Energy Per Bit by Power Model in the Wireless Transceiver System
Choi, Jae-Hoon ; Jo, Byung-Gak ; Baek, Gwang-Hoon ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1078~1085
DOI : 10.5515/KJKIEES.2011.22.12.1078
In this paper, we analyze the relationship between energy per bit and the data rate with the variation of the system bandwidth. A existing power model is mathematical model to express power consumption of each device. In this paper, we have to investigate the system level energy model for the RF front-end of a wireless transceiver. Also, the effects of the signal bandwidth, PAR, date rate, modulation level, transmission distance, specific attenuation of frequency band, and the signal center frequency on the RF front-end energy consumption and system capacity are considered. Eventually, we analyze the relationship between energy per bit and the data rate with the variation of the system bandwidth so that we simulate the minimum energy per bit in the several Gbps data rate using Shannon capacity theory.
A New Design of Trisection Band-Pass Filter Based on Electromagnetic Simulation
Kim, So-Su ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1086~1096
DOI : 10.5515/KJKIEES.2011.22.12.1086
In this paper, we present the trisection band-pass filter with a transmission zero at 2.63 GHz, which has a center frequency of 2.44 GHz, relative bandwidth of 5 %, and return loss of 18 dB, based on a multi-port ElectroMagnetic simulation. The coupling matrix for the trisection filter is calculated and this filter is transformed into band-pass filter prototype through a lossless 2-port circuit transformation. The J-inverter values and slope parameters of each individual resonator are computed using an EM simulation Y-parameters of the filter with multi port. The dimensions of desired filter are determined by matching the computed J-inverter and susceptance slope parameters to those of the prototype band-pass filter. Undesired cross-couplings are found to occur which does not appear in the prototype trisection filter. To overcome the problem of undesired couplings, the filter was optimized to satisfy the same frequency response of prototype filter. The validity of the proposed design method was verified through the implementation of the designed and optimized filter.
Implementation of Wideband SSM with Excellent Sideband and Carrier Suppression
Kim, In-Seon ; Park, Young-Ju ; Kim, Jang-Pyo ; Jeon, Jeong-Il ; Kim, Moo-Hoi ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1097~1106
DOI : 10.5515/KJKIEES.2011.22.12.1097
In this paper, we present design method of wideband single-sideband mixer(SSM) with excellent sideband suppression and carrier suppression. We proposed SSM with 4-band split structure for uniform output flatness. From circuit simulation of this structure using Microwave OfficeTM, we got satisfactory results. We realized a SSM based on this results, then we experimented. The measured results show excellent agreements with the simulated results. We compared with two SSM's(target SSM(M Co. SM0218LC1CDC SSM) and our SSM) as well. The presented SSM is 3.35 times bigger, but sideband suppression is 3 dBc better and carrier suppression is 8 dBc better than those of comparative SSM, respectively.
Design of Headset MIMO Antenna for On-Body Application
Kim, Sung-Jin ; Kim, Dong-Ho ; Kwon, Kyeol ; Choi, Jae-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1107~1115
DOI : 10.5515/KJKIEES.2011.22.12.1107
In this paper, a headset multiple-input multiple-output(MIMO) antenna for on-body application is proposed and the antenna performance with body effect and the impact on human body are investigated. The proposed MIMO antenna is composed of two planar inverted-F antennas(PIFA) above ground plane and an isolator located between the two antennas enhance the isolation characteristic. Simulation was carried to analyze the effect of human body on antenna performance when a human body is located in the near field of the antenna. According to the measurement result, the diversity performance of the proposed antenna can be considered good since ECC(Envelope Correlation Coefficient), which commonly indicates the performance of a MIMO antenna, remains below 0.1 over the ISM band. The measured SAR values for antennas 1 and 2 are 0.575 W/kg and 0.571 W/kg, respectively when 250 mW input power in engaged. These values satisfy the FCC guideline which states that the 1-g average SAR should be lower than 1.6 W/kg.
Path-Loss Modeling for Human Channel of WBAN System
Mun, Ji-Yeon ; Kim, Tae-Hong ; Seo, Min-Gyeong ; Pack, Jeong-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1116~1123
DOI : 10.5515/KJKIEES.2011.22.12.1116
In this paper, we studied the propagation of the radio wave in the human body for WBAN system and proposed the path-loss models applicable in the MICS and ISM frequency band. Human Tissues are composed of complicate organ. So it is difficult to measure to insert the probe in human body. Accordingly, the equations were modelled by electromagnetic analysis using the numerical phantom based on the real human. The numerical analysis used XFDTD 6.5 of Remcom co. in commercial software based on the Finite-Difference Time-Domain method. Human body model used a standard adult Korean model developed by ETRI. The proposed channel models will be very helpful to design the WBAN system.
Algorithm Study for Diagnosis the Breast Cancer Using LMA and FDTD
Seo, Min-Gyeong ; Kim, Tae-Hong ; Mun, Ji-Yeon ; Jeon, Soon-Ik ; Pack, Jeong-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1124~1131
DOI : 10.5515/KJKIEES.2011.22.12.1124
In this paper, image reconstruction algorithm for breast cancer detection using MT(Microwave Tomography) was investigated. The breast cancer detection system under development uses 16 transmit/receive antennas. The signal waveform was a sinusoidal wave at 900 MHz. To solve the 2D inverse scattering problem, we used the 2D FDTD (Finite Difference Time Domain) method for forward calculation and LMA(Levenberg-Marquardt Algorithm) for optimization. The result of the image reconstruction using the numerical phantom by MRI(Magnetic Resonance Imaging) obtained from real patient of breast cancer showed that we can detect the position of the tumor accurately.
Synthesis of Linear Antenna Array Patterns with Multiple Broad Nulls Using Schelkunoff Polynomial
Park, Eui-Joon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1132~1138
DOI : 10.5515/KJKIEES.2011.22.12.1132
In this paper, a method for synthesizing the linear antenna array patterns with broad nulls(BN) at the interference directions is newly presented. Opposit to the conventional methods in which the weights of array elements are optimized for BN control, this method simplifies the control process for multiple BN directions and widths by optimally perturbing the zero positions inherent to Schelkunoff polynomial transformed from the array factor. It is also shown that this method can be easily applicable to the phased array antennas. The proposed scheme is numerically verified by substituting the extracted complex weights into the array factor.
Design and Fabrication of S-Band GaN SSPA for a Radar
Lee, Jeong-Won ; Lim, Jae-Hwan ; Kang, Myoung-Il ; Han, Jae-Seob ; Kim, Jong-Pil ; Lee, Sue-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1139~1147
DOI : 10.5515/KJKIEES.2011.22.12.1139
In this paper, a design and fabrication of GaN power amplifier for the S-band frequency (400 MHz bandwidth) are presented. A combining path using
/4 transmission line is implemented for GaN pallet amp. Both the combiner with suspended-type transmission structure for low-loss and the suspended stripline coupler with aperture coupling for auto gain control are realized for achieving high-power high-efficiency amplifier. Proposed power amplifier demonstrated a 5 kW peak output power, 27.8 % efficiency, 67 dB gain without ALC and a 4 kW peak output power, 25.5 % efficiency, 0.1 dB droop at 200 usec pulse width and 10 % duty with ALC.
Analysis of Radiation Characteristics of Ka-Band Von Karman Radome Based on IPO Scheme
Koh, Il-Suek ; Park, Chang-Hyun ; Sun, Woong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1148~1154
DOI : 10.5515/KJKIEES.2011.22.12.1148
In this paper, the radiation properties of a Ka-band Von Karman radome are analyzed by using an IPO(Iterative PO) scheme. Since the operating frequency is very high, and the size of the considered radome is large, a numerical method cannot be directly applied to calculate the properties of the radome such as transmission loss, radome pattern, boresight error, etc. Hence, in this paper, an IPO scheme is used, which can efficiently consider the multiple interaction inside the radome. Also, the IPO scheme is based on the PO scheme, which is efficient and fast in a numerical point of view. The proposed scheme is verified based on Ku-band measurement data, and its feasibility for applicability to a higher frequency simulation is addressed through a simulation at the Ka-band.
Transmit-Beam Pattern Measurement of the Active Phased-Array Antenna Using Near-Field Measurement Facility
Chae, Hee-Duck ; Kim, Han-Saeng ; Lee, Dong-Kook ; Jeong, Myung-Deuk ; Park, Jong-Kuk ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1155~1164
DOI : 10.5515/KJKIEES.2011.22.12.1155
In this paper, we proposed the transmit beam measurement method of active phased array antenna, which is installed in Korea's first developed naval medium range radar, using near-field measurement facility. The pulse-mode high power characteristics of active phased array antenna's trasmit-beam make it difficult to measure with general near-field measurement facilities where low power continuous RF signals are used. Thus, in this paper, the measurement method of active phased array antenna's transmit beam in conjunction with the near-field measurement facility, which is suitable for the high-power transmit beam measurement, and PNA-X network analyzer(Agilent Technologies), which can support pulse-mode measurement, was proposed and measured by near-field measurement techniques. And the EIRP(Effective Isotropic Radiated Power), the transmit characteristic of active phased array antenna, was measured by the near field measurement techniques and compared to numerical estimation which was nearly equal with small difference of 0.1 dB.
A Study on Hidden Node Margin to Protect DTV Service in Korea
Kang, Kyu-Min ; Cho, Sang-In ; Jeong, Byung-Jang ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1165~1171
DOI : 10.5515/KJKIEES.2011.22.12.1165
In this paper, we investigate hidden node problem to effectively utilize TV band devices(TVBDs) in the TV white space(TVWS), and also to protect digital television(DTV) service in Korea. Firstly, we classify the radio propagation environment into an urban area, a basin area, and a coastal area based on geographical characteristics. Thereafter, we measure and analyze local shape based hidden node attenuation at eight segmented positions in each geographic area. Because commercial buildings as well as residential and commercial buildings in Korea are located in closer proximity to each other than in other countries, hidden node margin should be more than 38 dB in order to safely protect DTV service in Korea.
Analysis of Adjacent-Channel Leakage-Ratio of Wide-Band Power Amplifiers through Multi-Tone Signals with Statistical Similarity
Park, Young-Cheol ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1172~1175
DOI : 10.5515/KJKIEES.2011.22.12.1172
In this paper, a design method of multi-tone signals for the measurement of adjacent-channel power-ratios on power amplifiers is suggested. Because most tests for power amplifiers in production are performed with single-tone signals, its testing accuracy is not guaranteed as the signal complexity increases. Therefore, the application of multi-tone signals to the testing is suggested by optimized complex coefficients of each tones for the best statistical similarity to the original modulated signal. From the verification, a 802.11a signal was replaced with a multi-tone signal of N=10, with the complex coefficients generated by the suggested method. The resulting measurements on the ACLR of 2.4 GHz power amplifier showed successful accuracy of less than 1 dB discrepancy.
Series-Fed Microstrip Array Antenna for Millimeter-Wave Applications
Kim, Jin-Hyuk ; Hwang, Keum-Cheol ; Shin, Jae-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1176~1179
DOI : 10.5515/KJKIEES.2011.22.12.1176
In this paper, design of series-fed microstrip antennas with sum and difference patterns is presented for millimeter-wave applications. The antenna was designed to exhibit high-gain and low side-lobe level(SLL) below -20 dB. A conventional transmission-line model, Taylor and Bayliss distributions were employed to determine current distribution for sum and difference patterns. Moreover, connecting lines between microstrip patches were tuned to achieve an optimized design. The measurement was also performed to validate the designed antennas.
Design of AEM FSS-Radome for Array Antenna
Kim, Sang-Keun ; Lee, Gi-Tae ; Seo, Il-Seong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1180~1183
DOI : 10.5515/KJKIEES.2011.22.12.1180
In this paper, we present a design of AEM radome with frequency selective surface using unit-cell EM simulation method and verified the performance of AEM radome by the radiation pattern measurements of
array-antenna. Measured results under near-field condition showed a good agreement with the simulation and far-field measured ones. And there were no radiation pattern variation between antenna only and antenna with AEM radome. From these results, we verified that AEM radome with frequency selective surface can be a solution to reduce the RCS of conventional mast and radar.
Design of Dual Band-Notched UWB Antenna with the Hilbert-Curve Slots
Kim, Dang-Oh ; Kim, Che-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 12, 2011, Pages 1184~1187
DOI : 10.5515/KJKIEES.2011.22.12.1184
In this letter, a planar monopole UWB antenna with dual band-notched characteristics is proposed. The band-stop characteristics is realized by embedding the 1st/3rd order Hilbert-curve slots on the patch. With the dimension adjustment of each Hilbert-curve slots, the band rejection from 3.3 to 3.7 GHz and from 5.3 to 6 GHz can be accomplished easily. The VSWR and radiation pattern of the fabricated antenna are measured, and the proposed antenna would be adequate to a UWB applications.