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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 20, Issue 12 - Dec 2009
Volume 20, Issue 11 - Nov 2009
Volume 20, Issue 10 - Oct 2009
Volume 20, Issue 9 - Sep 2009
Volume 20, Issue 8 - Aug 2009
Volume 20, Issue 7 - Jul 2009
Volume 20, Issue 6 - Jun 2009
Volume 20, Issue 5 - May 2009
Volume 20, Issue 4 - Apr 2009
Volume 20, Issue 3 - Mar 2009
Volume 20, Issue 2 - Feb 2009
Volume 20, Issue 1 - Jan 2009
Selecting the target year
A Resonance Power Combining Technique Using CRLH-Transmission Line
Kim, Ell-Kou ; Kim, Young ; Kwon, Sang-Keun ; Yoon, Young-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 673~679
DOI : 10.5515/KJKIEES.2009.20.8.673
This paper proposes a resonance power-combining technique using CRLH-transmission line. The circuits using proposed technique consist of the parallel capacitances and transmission lines to satisfy matching conditions and to combine power of amplifiers. The CRLH(Composite Right/Lefi-Handed) transmission lines are used to reduce the circuit size. As a result, the power combining amplifier using proposed techniques is measured that a gain is equal and the output power is increased about 2.2 dB higher than the single amplifier. Also, a size of amplifier is 78.3 % smaller than the conventional amplifier using RH transmission line.
Broad-Band Substrate Integrated Waveguide Power Divider with Excellent Isolation Performance
Kim, Kyeong-Min ; Byun, Jin-Do ; Jung, Kyung-Young ; Lee, Hai-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 680~687
DOI : 10.5515/KJKIEES.2009.20.8.680
In this paper, we propose a substrate integrated waveguide(SIW) power divider to yield excellent broadband isolation performance. In order to achieve high broadband isolation, a two stage Wilkinson power divider is employed in SIW. The measurement results show the insertion loss(
dB) and input return loss(
of 10 dB) from 13.12 GHz to 16.14 GHz. Moreover, the results show that the output return loss and isolation between output ports are larger than 10 dB between 10.37 GHz and 17.64 GHz.
Design of Microstrip Antenna to Tune Resonant Frequency with Voltage Control
Kim, Young-Ro ; Woo, Jong-Myung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 688~693
DOI : 10.5515/KJKIEES.2009.20.8.688
In this paper, a half wave-length microstrip antenna was proposed to be able to continuously tune the resonant frequency in the stated area of UHF ISM band. By loading varactor diodes at both edges of the half wavelength antenna, where the electric field is the strongest, and varying the voltage in order to tune the electrical resonance length continuously, it is possible to automatically recover the resonant frequency and input impedance shifted by surrounding environment. When the microstrip antenna(center resonant frequency: 425 MHB) was tested, by adjusting the each voltages of varactor diodes from DC 0.6 to BC 3.0 volts, the resonant frequency under 20 dB return loss was varied 385 to 465 MHz. The peak gain was -0.2 dBd and return loss -10 dB bandwidth was 3.3 MHz(0.8 %).
Design of a Broadband Printing RFID Tag Antenna with Low Performance Degradation Due to Nearby Dielectric Material
Ji, Sung-Hwan ; Han, Won-Keun ; Park, Ik-Mo ; Choo, Ho-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 694~700
DOI : 10.5515/KJKIEES.2009.20.8.694
In this paper, we propose a RFID tag antenna with low performance degradation due to nearby dielectric materials. The proposed antenna is designed to be appropriate for ink printing fabrication. The antenna is designed to operate in UHF band of
MHz. The antenna uses a T-matching network in the middle of the main body and two parasitic patches in vicinity for complex conjugate matching with a commercial tag chip. In addition, the two parasitic patches induce currents at different dielectric constants of nearby dielectric materials. This can minimize the performance degradation due to nearby dielectric materials. The measured results show the half power matching bandwidth from 844 MHT to 1,268 MHz. It exhibits the reading distance of about 3.5 m in free space when the tag antenna is used with the commercial reader antenna (transmitting power of 20 dBm and the reader antenna gain of 6 dBi). When the tag is attached on dielectric materials of wood and FR4, the resulting reading distances are 2.61 m and 2.51 m, respectively.
Adaptive Multi-Tap Equalization for Removing ICI Caused by Transmitter Power Transient in LTE Uplink System
Chae, Hyuk-Jin ; Cho, Il-Nam ; Kim, Dong-Ku ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 701~713
DOI : 10.5515/KJKIEES.2009.20.8.701
This paper studies a method for reducing performance degradation due to losing sub-carrier orthogonality caused by power transient between physical channels in LTE uplink transmission. The pattern of inter-carrier interference(ICI) caused by power transient is different from what has been studied for doppler shift, in that its pattern occurs at front and rear sides of channels in each period of power transient. The reason of ICI`s occurrence results from power difference between channels, power transient duration, multi-path channel delay spread, and numbers of sub-carrier. New criterion is proposed to find out number of taps of multi-tap equalizer enough to improve the ICI. The scheme is to determine the number of taps of multi-tap equalizer when a normalized interference or a normalized ICI is greater than a normalized noise. Simulation results show that the number of taps is flexibly adjusted according to SNR(Signal to Noise Ratio) of a received signal to improve Bit Error Rate(BER), while the complexity of the proposed scheme is reduced down to 88 percentage of the classical method.
Design of a Band-Tunable Ultra-Wideband Single-Balanced Doubler
Kim, In-Bok ; Kim, Young-Gon ; Jang, Tae-Gyoung ; Song, Sun-Young ; Kim, Kang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 714~720
DOI : 10.5515/KJKIEES.2009.20.8.714
In this paper, design and the implementation method of a band-tunable ultra-wideband planar doubler are described Microstrip-to-CPS(balun) transition and Microstrip-to-CPW transition are respectively used for input/output matching circuits for the doubler. The Input balun structure allows to apply diode bias, and the doubler output frequency is tunable by changing the diode bias voltage. With the bias voltage of -0.6 V, the measured operating frequency band of the implemented doubler is
GHz, with the bias voltage of
V, the operating frequency band is
GHz, and with 0 V bias, the operating frequency band is
GHz. The doubler provides conversion loss of less than 15 dB and fundamental frequency suppression of 30 dB.
4-Way Power Divider Based on Substrate Integrated Waveguide for Satellite Communications
Seo, Tae-Yoon ; Lee, Jae-Wook ; Lee, Taek-Kyung ; Cho, Choon-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 721~728
DOI : 10.5515/KJKIEES.2009.20.8.721
Equal/unequal 4-way power divider suitable for satellite communication using SIW technology is presented in this paper. The control of positions of guiding posts provides equal or unequal power division ratios by maintaining the width of the SIW unchanged. In addition, the detailed descriptions for the proposed power divider include the general characteristics of radial waveguide, feeding part using coaxial cable, simple SIW structure, power-guiding posts, and transition for measurement. The comparison between the simulated and measured data shows a good agreement at a center frequency of 10 GHz. The measured input impedance bandwidths for equal and unequal power divisions are about 2.1 GHz and 3 GHz under the condition of less than VSWR 2:1, respectively.
Parasitic Elements Analysis and Filter Design for LTCC Multi-Layer Filter
Lee, Hye-Sun ; Kim, Yu-Seon ; Pyo, Hyun-Seong ; An, Jae-Min ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 730~738
DOI : 10.5515/KJKIEES.2009.20.8.730
In this paper, we present a equivalent circuit considered parasitic elements about LTCC multi-layer BPF structure that was studied previously and a process of extraction of the element value using SOC technique. By applying extracted element values to equivalent circuit, 2th LTCC filter was designed and fabricated that was applied to satellite DMB. The filter was fabricated of Dupont951 substrate with relative permittivity of 7.8, the dimension of the fabricated filter is
. The measurement results indicate 1.4 dB of insertion loss and 32.3 dB of return loss, which are in good agreement with simulated ones.
Design for Trapezoidal Planar UWB Antenna Using Symmetry Meander Feedline
Kim, Tae-Geun ; Min, Kyeong-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 739~745
DOI : 10.5515/KJKIEES.2009.20.8.739
This paper presents a design for trapezoidal planar UWB(Ultra Wide-band) antenna using symmetry meander line to realize broad bandwidth at low frequency region. The size of proposed design antenna is
and dielectric substrate considered in design has 4.4 of relative permittivity. The calculated bandwidth is from 1.31 GHz to 10.83 GHz and the measured return loss is 1.5 GHz to 10.6 GHz at -10 dB below, and satisfies with the UWB antenna`s bandwidth. The simulated and measured radiation patterns show fine agreement with each other at each frequency.
Development of an Optimal Design Program for a Triple-Band PIFA Using the Evolution Strategy
Ko, Jae-Hyeong ; Kim, Koon-Tae ; Kim, Dong-Hun ; Kim, Hyeong-Seok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 746~752
DOI : 10.5515/KJKIEES.2009.20.8.746
In this paper, we deal with the development of an optimal design program for a triple-band PTFA(Planar Inverted-F Antenna) of 433 MHz, 912 MHz and 2.45 GHz by using evolution strategy. Generally, the resonance frequency of the PIFA is determined by the width and length of a U-type slot used. However the resonance frequencies of the multiple U slots are varied by the mutual effect of the slots. Thus the optimal width and length of U-type slots are determined by using an optimal design program based on the evolution strategy. To achieve this, an interface program between a commercial EM analysis tool and the optimal design program is constructed for implementing the evolution strategy technique that seeks a global optimum of the objective function through the iterative design process consisting of variation and reproduction. The resonance frequencies of the triple-band PIFA yielded by the optimal design program are 430 MHz, 910.5 MHz and 2.458 GHz that show a good agreement to the design target values.
A Planar Spiral Antenna of Multi-Tabs for Wireless Power Transmission of Inductive Coupling
Kim, Jin-Wook ; Son, Hyeon-Chang ; Jeong, Seung-Ho ; Kim, Seung-Gyun ; Kim, Kwan-Ho ; Park, Young-Jin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 753~760
DOI : 10.5515/KJKIEES.2009.20.8.753
In this paper, a novel planar spiral antenna of multi-tabs is proposed for wireless power transmission system based on low frequency magnetic inductive coupling. The proposed antenna has higher transmission efficiency than conventional antennas such a rectangular spiral antenna and a spiral antenna. Also, it has a useful property of uniform power transmission in the region of the antenna aperture. For verification, a transmitting antenna and a receiving one for a wireless power transmission system using magnetic inductive coupling of 132 kHz low frequency are designed and tested. The transmitting antenna has three-tabs spiral of unequal-space for higher uniform magnetic coupling in the antenna aperture. For reducing the receiving antenna size, two receiving antennas of unequal space two-tabs on one-side and series double sides as well are designed, respectively. From measurement, transmission efficiency of the proposed antennas is improved up to
dB compared to conventional antennas.
Design of Diversity Vehicle Antennas for FM Radio Reception
Ahn, Seung-Beom ; Noh, Young-Ho ; Oh, Jung-Hoon ; Choo, Ho-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 761~769
DOI : 10.5515/KJKIEES.2009.20.8.761
In this paper, we report on the channel capacity and diversity gain of the vehicle on-glass antenna for FM radio reception. The correlation coefficient and channel capacity were obtained using the simulated 3D radiation pattern of each antenna and the Rayleigh channel model for urban environment. To examine the channel capacity we used two antennas which are a simple straight antenna and L-type antenna. Then we observed the available channel capacity by varying the position of feeds and the shape of the L-type antenna. The sample antenna, which has a maximum feed distance with different polarizations, was built and the receiving performance was measured in the weak FM field area. From the results we confirmed that the distance between the feeds should be placed as far as possible for the high channel capacity. If the distance between the feeds are greater than a certain threshold value than the polarizations of the two antennas are getting more important for determining the channel capacity.
Design of QPSK Demodulator Using CMOS BPSK Receiver and Reflection-Type Phase Shifter
Moon, Seong-Mo ; Park, Dong-Hoon ; Yu, Jong-Won ; Lee, Moon-Que ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 770~776
DOI : 10.5515/KJKIEES.2009.20.8.770
We propose and demonstrate an I/Q demodulator using four-port BPSK demodulator base on additive mixing and reflection-type phase shifter using hybrid technique. Previously, the conventional I/Q demodulator base on multiplicative or additive mixing method divides I/Q signal path from mixer to parallel-to-serial converter. In this paper, we propose new I/Q demodulator without dividing I/Q baseband signal path. The proposed schematic requires half size in implementation and half power consumption in baseband path compared with the conventional receiver. Also, the proposed receiver eliminates parallel-to-serial converter after data decoding. The proposed circuit has been successfully demodulated a QPSK signal with the L-band carrier frequency and 20 Mbps data rate.
Low-Power Wireless Transmission at 2.45 GHz Band
Choi, Ki-Ju ; Hwang, Hee-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 777~783
DOI : 10.5515/KJKIEES.2009.20.8.777
In this paper, we implemented a wireless power transmission system at 2.45 GHz. The transmission power is limited within 20 dBm according to the ISM frequency regulations. We used two zero-bias Schottky diode and optimized the RF-DC converter for working a clock at 80 cm distance using a receiver with a single antenna and an Rf-DC converter to reduce parts and cost compared to previously reported literatures.
High Resolution Forward-Looking Collision Avoidance Automotive Radar Using Stepped-Frequency Pulsed-Doppler(SFPD) Technique
Woo, Sung-Chul ; Kwag, Young-Kil ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 784~790
DOI : 10.5515/KJKIEES.2009.20.8.784
A forward-looking automotive radar typically utilizes the frequency modulated continuous wave(FMCW) or pulsed-Doppler waveform for the Information acquisition of the target range and velocity. In order to obtain the high resolution target information, however, a narrow pulse width and wide bandwidth are inherently required, thus resulting in high peak power and high speed digital converter processing. In this paper, a stepped-frequency pulsed-Doppler(SFPD) waveform algorithm is proposed for high resolution forward looking automotive radar application. The performance of the proposed SFPD waveform technique is analyzed and compared with the conventional FMCW and PD method. Since this technique can be used for the high resolution target imaging with arbitrary range and Doppler resolution, it is expected to be useful In automotive radar target classification for the precision collision avoidance applications in the future.
A Hybrid IPO-MoM Technique for Wave Scattering Analysis of Jet Engine
Lim, Ho ; Choi, Seung-Ho ; Myung, Noh-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 791~796
DOI : 10.5515/KJKIEES.2009.20.8.791
A hybrid iterative physical optics-method of moments(IPO-MoM) technique is presented for the analysis of jet engine structures which are both electrically large and complex. In this technique, the IPO method is used to analyze smooth inlet region and the MoM method is used to analyze electrically complex region inclusive of blades and hub. It is efficient and accurate by virtue of combining the respective merits of both methods. Numerical results are presented and validated through comparison with Mode-FDTD and measured results.
MoM Forward Solver for Medical Microwave Imaging
Kim, Bo-Ra ; Lee, Taek-Kyung ; Son, Seong-Ho ; Jeon, Soon-Ik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 797~805
DOI : 10.5515/KJKIEES.2009.20.8.797
In this paper, we developed MoM(Moment of Method) forward solver to implement the inverse scattering by using BIM(Born Iterative Method) for the detection of cancer in human body Especially, we adopted two-dimensional breast structure to analyze electromagnetic scattered phenomena. For the two-dimensional scattering structure, the integral equations is solved with MoM employing two-dimensional Green`s function. Also, calculated results are compared with the measured results obtained from breast cancer detecting equipment.
Omnidirectional Circularly Polarized Antenna Using Zeroth-Order Resonance
Park, Byung-Chul ; Lee, Jeong-Hae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 806~812
DOI : 10.5515/KJKIEES.2009.20.8.806
In this paper, the omnidirectional circularly polarized(CP) antenna using arc-shaped mushroom structure with curved branch is proposed. To obtain a vertical polarization and an omnidirectional radiation pattern, the CP antenna uses zeroth-order resonance(ZOR) mode of composite right and left handed(CRLH) transmission line. The horizontal polarization is achieved by the curved branches. Also, the spacing between curved branch and arc-shaped mushroom structure gives the
phase difference between vortical and horizontal polarization. The proposed antenna, therefore, has an omnidirectional CP radiation pattern In the azimuthal plane. The electrical size of the proposed antenna is reduced by 38%, compared with that of the previously presented omnidirectional CP antenna. In addition, the CP antenna is simply designed without
phase shifter and dual feed line. The proposed antenna uses a Bazooka balun for good impedance matching and radiation pattern. To improve 3 dB axial ratio in XY plane, the designed antenna is optimized. After optimization, the measured 3 dB axial ratio in XY plane is observed in
Asymmetric Saturated 3-Stage Doherty Power Amplifier Using Envelope Tracking Technique for Improved Efficiency
Kim, Il-Du ; Jee, Seung-Hoon ; Moon, Jung-Hwan ; Son, Jung-Hwan ; Kim, Jung-Joon ; Kim, Bum-Man ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 8, 2009, Pages 813~822
DOI : 10.5515/KJKIEES.2009.20.8.813
We have investigated operation of a 1:2:2 asymmetric 3-stage Doherty PA(Power Amplifier) and implemented using the Freescale`s 4 W, 10 W PEP LDMOSFETS at 1 GHz. By employing the three peak efficiency characteristics, compared to the two peak N-way Doherty PA, the asymmetric 3-stage Doherty can overcome the serious efficiency degradation along the backed-off output power region and maximize the average efficiency for the modulation signal. To maximize the efficiency characteristic, the inverse class F PA has been designed as carrier and peaking amplifiers. Furthermore, to extract the proper load modulation operation, the adaptive gate bias control signal has been applied to the two peaking PAs based on the envelope tracking technique. For the 802.16e Mobile WiMAX(World Interoperability for Microwave Access) signal with 8.5 dB PAPR(Peak to Average Power Ratio), the proposed Doherty PA has shown 55.46 % of high efficiency at an average output power of 36.85 dBm while maintaining the -37.23 dB of excellent RCE(Relative Constellation Error) characteristic. This is the first time demonstration of applying the saturated PA and adaptive gate bias control technique to the asymmetric 3-stage Doherty PA for the highly efficient transmitter of the base-station application.