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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 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
Dual-Band Array Antenna Using Modified Sierpinski Fractal Structure
Oh, Kyung-hyun ; Kim, Byoung-chul ; Cheong, Chi-hyun ; Kim, Kun-woo ; Lee, Duk-young ; Choo, Ho-sung ; Park, Ik-mo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 921~932
DOI : 10.5515/KJKIEES.2010.21.9.921
This paper presents a dual-band array antenna based on a modified Sierpinski fractal structure. Array structure is mirror symmetric, and forms broadside radiation pattern for dual frequency band if the ports are fed with
phase difference between upper and lower
array. To use in-phase corporate feeding circuit, the phase inversion structure is designed by changing the position of patch and ground for upper and lower array. The dimensions of the array antenna is
and the bandwidth of 855~1,380 MHz(47 %), 1,770~2,330 MHz(27 %) were achieved for -10 dB return loss. The measured gain is 9.06~12.44 dBi for the first band and 11.76~14.84 dBi for the second band. The half power beam width is
for x-z plane and
for y-z plane at 1,100 MHz and
at 2,050 MHz, respectively.
Design of Modified Spiral Monopole Printed Antenna for Dual Band Operation
Cheong, Sae-Han-Sol ; Jung, Jin-Woo ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 933~939
DOI : 10.5515/KJKIEES.2010.21.9.933
In this paper, modified spiral monopole printed antenna for dual band operation in GPS(1.57~1.577 GHz) and WiBro(2.3~2.4 GHz), WLAN(2.4~2.48 GHz) is proposed. To control the frequency ratio of the antenna for dual band operation freely, distance between inner lines of the spiral is diversified by using the different current distribution between basic resonance frequency of spiral monopole antenna and harmonic resonance frequency
. And also the branch line is inserted. Bandwidth(-10 dB) of the antenna is measured 140 MHz(1.47~1.61 GHz) in basic resonance frequency and 420 MHz(2.29~2.71 GHz) in harmonic resonance frequency
. The peak antenna gains are measured 2.825 dBi in GPS(1.57 GHz), and 3.65 dBi in WiBro(2.35 GHz), and 4.564 dBi in WLAN(2.44 GHz).
Design and Implementation of WWAN Antenna with Metal Structure for Increasing Frequency Bandwidth and Gain
Lee, Keon-Myung ; Cho, Il-Hoon ; Cho, Young-Hee ; Lee, In-Young ; Kim, Young-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 940~946
DOI : 10.5515/KJKIEES.2010.21.9.940
In this paper, we proposed the internal antenna on PCB(Planar Circuit Board) for achieving WWAN(Wireless Wide Area Network) operation in the laptop computer. The proposed antenna has a metal structure instead of printed pattern on PCB to improve the antenna characteristics for GSM850/900 bands. Compared to PCB embedded antenna without metal structure, the proposed antenna occupies similar area of
with before and the bandwidth of the proposed one for GSM850/900 bands is increased 13 MHz than before. Further we confirmed that the proposed antenna has higher radiation gain of -4.45~-2.29 dBi for GSM850/900 bands than PCB embedded antenna without metal structure.
The Azimuth Calculation Algorithm of Pulse-Doppler Radar for GVES
Park, Gyu-Churl ; Ha, Jong-Soo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 947~954
DOI : 10.5515/KJKIEES.2010.21.9.947
The decision of threat target in the MWR(Missile Warning Radar) of GVES(Ground Vehicle Equipment System) such as MBT(Main Battle Tank) is very important. Threat decision is judged by angular rate and the accurate azimuth calculation for good threat decision is very important. The angular rate is dependent upon the direction of an approaching target. The target is classified into a threat or non-threat using a boundary condition of the angular rate. This paper presents the eighth azimuth calculation methods and compares the results.
A Study of T/R Module Output Compensation Method for Active Synthetic Aperture Radar
Yi, Dong-Woo ; Lee, Jong-Hwan ; Kim, Se-Young ; Jeon, Byoung-Tae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 955~964
DOI : 10.5515/KJKIEES.2010.21.9.955
In this paper, a compensation method of the amplitude and phase errors from the T/R(Transmit/Receive) modules in an active SAR(Synthetic Aperture Radar) system is introduced. The errors are defined and classified, and characterized by analyzing the measurement data acquired from the pilot test. To compensate these errors, a control methodology of T/R modules output is proposed. Before the compensation is applied, 16 T/R modules integrated on the active SAR antenna show the amplitude in 28.2~29.0 dBm and the phase in
. After the compensation, the amplitude and phase are distributed in 27.4~28.0 dBm and
respectively. The antenna beam patterns generated by the array theory with the distributions are compared, and the proposed method is verified as good to apply for the active SAR system.
Effective Comb Type Pilot Assignment and PAPR Reduction in NC-OFDM-Based Communication System
An, Dong-Geon ; Ryu, Heung-Gyoon ; Lee, Seung-Jun ; Ko, Dong-Kuk ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 965~970
DOI : 10.5515/KJKIEES.2010.21.9.965
Because of a large number of subcarriers, the high PAPR(Peak-to-Average Power Ratio) is the major drawback of NC-OFDM system used for wireless communication system. Comb type pilot assignment is more efficient and lower computational complexity for the channel estimation than the block type pilot. However, even if the CAZAC(Constant Amplitude Zero Autocorrelation) matrix transform is used for the PAPR reduction of the data symbols, PAPR increases when the pilot is inserted in comb type with the data symbols. Therefore, in this paper, we additionally use a new SLM technique in order to lower the PAPR again even in the comb type pilot. Also, a new SLM technique suggested in this paper does not need any additional bandwidth for sending selection information for SLM. This combined method has good PAPR reduction performance and efficient data transmission.
Compact Multiple Meander RFID Tag Antenna with Broadband Characteristic
Jung, Hak-Joo ; Lee, Sang-Woon ; Choo, Ho-Sung ; Park, Ik-Mo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 971~978
DOI : 10.5515/KJKIEES.2010.21.9.971
In this paper, we propose a compact multiple meander RFID tag antenna with broadband characteristic. The proposed tag antenna has been designed using the multiple meander form to effectively minimize the U-shaped half wavelength dipole antenna as the radiator part. The commercial tag chip is attached to the upper center of the rectangular shaped feed for impedance matching. The size of the antenna is
and VSWR<5.8 bandwidth is 855~964 MHz which covers the world UHF RFID bandwidth.
RCS Extraction of Trihedral Corner Reflector for SAR Image Calibration
Kwon, Soon-Gu ; Yoon, Ji-Hyeong ; Oh, Yi-Sok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 979~986
DOI : 10.5515/KJKIEES.2010.21.9.979
This paper presents an algorithm for retrieving precise radar cross sections(RCS) of various trihedral corner reflectors (TCR) which are external calibrators of synthetic aperture radar(SAR) systems. The theoretical RCSs of the TCRs are computed based on the physical optics(PO), geometrical optics(GO), and physical theory of diffraction(PTD) techniques; that is, the RCS computation includes the single reflections(PO), double reflections(GO-PO), triple reflections(GO-GO-PO), and edge diffractions(PTD) from the TCR. At first, we acquire an SAR image of the area that five TCRs installed in, and then extract the RCS of the TCRs. The RCSs of the TCRs are extracted accurately from the SAR image by adding up the power spill, which is generated due to the radar IRF(Impulse Response Function), using a square window. We compare the extracted RCSs with the theoretical RCSs and analyze the difference between the theoretical and experimental RCSs of the TCR for various window sizes and various backscattering coefficient levels of the adjacent area. Finally, we propose the minimum size of the integration area and the maximum level of the backscattering coefficients for the adjacent area.
A Study on Efficiency Improvement of X-Band Power Amplifier Using Harmonic Control Circuit
Kim, Hyoung-Jong ; Choi, Jin-Joo ; Kim, Dong-Yoon ; Na, Hyung-Gi ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 987~994
DOI : 10.5515/KJKIEES.2010.21.9.987
In this paper, a simple and effective active load-pull method is proposed, and the method to improve the efficiency of X-band power amplifier using harmonic control circuit is presented. The proposed active load-pull system mainly consists of directional coupler, phase shifter, short circuit, and power amplifier, and allows a user to access reflection coefficients near the edge of the Smith chart(
=1) easily. The device used in this paper is Mitsubishi's GaAs FET MGF1801, and the operating frequency of the power amplifier is 9 GHz, The amplifier had output power of 21.65 dBm and drain efficiency of 24.9 % at class-A, and had output power of 21.46 dBm and drain efficiency of 53.3 % at class-AB. Harmonic control circuit is designed only second and third harmonic components because of the bandwidth limitation of the microwave components. The drain efficiency is improved as much as 6.4 % compared with class-AB power amplifier.
SNR Estimation Based on Correlation of Decision Feedback Signal in OFDM System
Kim, Seon-Ae ; Ryu, Heung-Gyoon ; Lee, Seung-Jun ; Ko, Dong-Kuk ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 995~1004
DOI : 10.5515/KJKIEES.2010.21.9.995
In the channel-varying environment, it is very important to estimate the signal to noise ratio(SNR) of received signal and to transmit the signal effectively for the modern communication system. The performance of existing non-data-aided (NDA) SNR estimation methods are substantially degraded for high level modulation scheme such as M-ary APSK or QAM. In this paper, we propose a SNR estimation method which uses zero point auto-correlation of received signal per block and auto-/cross- correlation of decision feedback signal in OFDM system. Proposed method can be studied into two Types; Type 1 can estimate SNR by zero point auto-correlation of decision feedback signal based on the second moment property. Type 2 uses both zero point auto-correlation and cross-correlation based on the fourth moment property. In block-by-block reception of OFDM system, these two SNR estimation methods can be possible for the practical implementation due to correlation based the estimation method and they show more stable estimation performance than the previous SNR estimation methods. Also, we mathematically derive the SNR estimation expression according to computational difference of auto-/cross-correlation. Finally, Monte Carlo simulations are used to verify the proposed method.
Radiation Characteristics of Log Periodic Cantor Koch Dipole Antennas
Park, Jae-Sung ; Choi, Hak-Keun ; Park, Jae-Hyun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 1005~1012
DOI : 10.5515/KJKIEES.2010.21.9.1005
In this paper, a novel log periodic cantor koch dipole antenna(LPCKDA), which is composed of the cantor Koch dipole elements instead of the Koch dipole elements, is proposed to reduce the size of the log periodic koch dipole antenna(LPKDA). To investigate the reliability of the proposed antenna, the LPCKDA is designed and analyzed at 0.5~1.5 GHz and compared with the LPKDA(Log Periodic Koch Dipole Antenna) characteristic. It is shown that although the proposed LPCKDA has a decreases of 5 % in the length of the dipole elements, radiation characteristics of LPCKDA are similar to radiation characteristics of the LPKDA.
Land Surface Temperature Measurements Using C-Band Radiometer
Jang, Tae-Gyeong ; Kim, Young-Gon ; Woo, Dong-Sik ; Son, Hong-Min ; Kim, Kang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 1013~1022
DOI : 10.5515/KJKIEES.2010.21.9.1013
In this paper, we propose a C-band radiometer for remote sensing of land surface temperature and present its experiment results using asphalt as target. Total power type is selected for high sensitivity and low power consumption, super-heterodyne type is selected for stable high gain. A radiometer designed at 5.1 GHz to have operating bandwidth of 110 MHz has system gain of 59 dB, noise figure of 2.7 dB and receiving sensitivity of 0.45 K. We have measured surface temperature on asphalt by using implemented system and thermometer. Analysis data of each measurement results show that a radiometer operates linearly with output voltage variation rate of 6
. As a result, we verified validity of a developed C-band radiometer for remote sensing of land surface temperature.
Design of Broadband Polarization Diversity Antenna for Mobile Base Stations
Seo, In-Jong ; Cho, In-Ho ; Lee, Cheon-Hee ; Jung, Jin-Woo ; Lee, Hyeon-Jin ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 1023~1029
DOI : 10.5515/KJKIEES.2010.21.9.1023
In this paper, we proposed the broadband polarization diversity antenna operating in the PCS, WCDMA and WiBro band for mobile base station. We designed the antenna using the dipole antenna of the square loop type and microstrip feeding structure. Additionally, we used the choke box to remove the distortion of radiation patterns by the reflector structure when operating broadband. The simulation was performed using MWS in a commercial tool of CST company and the antenna was fabricated on a teflon substrate with 3.33 of the relative permittivity. The proposed antenna has the bandwidth of 640 MHz(from 1.75 to 2.39 GHz) when VSWR is below 1.5. At the operating bands, the interisolation between the cross-pair radiators is less than -25 dB and the maximum gains for PCS, WCDMA and WiBro band are 8.9, 8.2 and 8.6 dBi, respectively.
Design of Broad Bandwidth Dipole Antenna with CMM Feeding Probe Structure
Lee, Ji-Chul ; Min, Kyeong-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 1030~1036
DOI : 10.5515/KJKIEES.2010.21.9.1030
This paper proposes a simulation design for feeding probe with the CMM(Cylindrical Magneto Material) structure for broad bandwidth of a dipole type antenna. In order to ensure low frequency bandwidth, the magnetic material with high relative permeability was considered in design calculation. It was confirmed that the broad bandwidth was independent on the relative permeability value and depended on the control of distance(
) between magnetic material and feeding probe, and of magnetic material thickness(
). Furthermore, an antenna size with the CMM was miniaturized about 18 % comparison with its size without the CMM.
Size-Reduced Ring-Hybrid Coupler Using Phase-Inverting Ultra-Wideband Transitions and Its Frequency Doubler Application
Song, Sun-Young ; Kim, Young-Gon ; Park, Jin-Hyun ; Kim, Kang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 1037~1044
DOI : 10.5515/KJKIEES.2010.21.9.1037
In this paper, a new size-reduced, wideband ring-hybrid coupler is presented, and a design of a planar single-balanced doubler using the ring-hybrid is shown. This ring-hybrid coupler employs a pair of ultra-wideband transitions for phase inversion, which consists of in-phase and out of-phase transitions providing a good amplitude and phase balances for wide frequency ranges. The implemented ring-hybrid is 65 % smaller than conventional ring-hybrids, and provides 92.5 % and 81.3 % bandwidth at
ports, respectively. Thanks to good amplitude and phase balances over wide bandwidth, the ring-hybrid can be applied to implement various balanced components. The implemented single-balanced doubler utilizing the ring-hybrid exhibits typical conversion loss of 10.5 dB for the output frequency range of 4~12 GHz with fundamental suppression level of 30 dB. The performance was also well-predicted with the nonlinear circuit simulation.
Design of an Ultra Low Power CMOS 2.4 GHz LNA
Jang, Yo-Han ; Choi, Jae-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 1045~1049
DOI : 10.5515/KJKIEES.2010.21.9.1045
In this paper, we proposed an ultra-low power low noise amplifier(LNA) using a TSMC 0.18
RF CMOS process. To satisfy the low power consumption with high gain, a current-reused technique is utilized. In addition, a low bias voltage in the subthreshold region is utilized to achieve ultra low power characteristic. The designed LNA has the voltage gain of 13.8 dB and noise figure(NF) of 3.4 dB at 2.4 GHz. The total power consumption of the designed LNA is only 0.63 mW from 0.9 V supply voltage and chip occupies
K-Band Array Patch Antenna Having Unequal Input Impedance
Kim, In-Ho ; Lee, Jeong-Hae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 1050~1055
DOI : 10.5515/KJKIEES.2010.21.9.1050
In this paper, the K band
array antenna having unequal input is presented. To control the input impedance of the patch antenna, the length of inset feed is adjusted. Also, the same current in each element is excited by Kirchhoff's law. The proposed unequal impedance array antenna is a nonuniform amplitude array. The bandwidth of the proposed unequal impedance array antenna is wider by 1.5 times than that of the equal array antenna. This broad bandwidth is thought to be due to multiple resonances of patches. The unequal impedance array antennas have fractional bandwidths of 5.07 % and gains of 18.32 dBi.
Approximate Method of Transmission Lines Crossing a Rectangular Aperture in a Backplane
Jung, Sung-Woo ; Choi, Beom-Jin ; Choi, Bong-Yeol ; Kim, Ki-Chai ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 1056~1064
DOI : 10.5515/KJKIEES.2010.21.9.1056
This paper presents the approximate analysis method for the symmetric transmission line crossing the aperture in an backplane. The method of moments is used to determine the aperture impedance for the construction of the equivalent transmission line that the aperture impedance apply to the transmission line as the shunt impedance. As the results, the insertion loss increases at the specific frequency range for the impedance matching. In the case of the mismatching, we are confirmed to the insertion gain at the specific frequency. Also the horizontal length of the aperture affects to the transmission line better than vertical length. The measurement of the insertion loss is performed to verify the theoretical analysis.
A Novel Harmonic Load Network for High Efficiency Class-F Power Amplifier at 2.14 GHz
Kim, Young-Gyu ; Chaudhary, Girdhari ; Jeong, Yong-Chae ; Lim, Jong-Sik ; Kim, Dong-Su ; Kim, Jun-Cheol ; Park, Jong-Cheol ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 9, 2010, Pages 1065~1071
DOI : 10.5515/KJKIEES.2010.21.9.1065
In this paper, we proposed a novel harmonic load circuit to design a high efficiency class-F amplifier. The proposed load circuit controls termination impedances to enhance the efficiency of class-F power amplifier. The termination impedances at the 2nd and the 3rd harmonics are showed short and open condition, respectively. Also, a fabricated load circuit showed an attenuation characteristic more than 29 dB, that is enough to eliminate harmonics of the class-F power amplifier. The measured drain and power-added efficiency are 75.7 % and 71.3 % at the point of maximum output power 35.17 dBm.