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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 25, Issue 12 - Dec 2014
Volume 25, Issue 11 - Nov 2014
Volume 25, Issue 10 - Oct 2014
Volume 25, Issue 9 - Sep 2014
Volume 25, Issue 8 - Aug 2014
Volume 25, Issue 7 - Jul 2014
Volume 25, Issue 6 - Jun 2014
Volume 25, Issue 5 - May 2014
Volume 25, Issue 4 - Apr 2014
Volume 25, Issue 3 - Mar 2014
Volume 25, Issue 2 - Feb 2014
Volume 25, Issue 1 - Jan 2014
Selecting the target year
Reconfigurable Polarization Patch Antenna with Y-Shaped Feed
Lee, Da-Ae ; Sung, Youngje ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 1~9
DOI : 10.5515/KJKIEES.2014.25.1.1
In this paper, a reconfigurable polarization patch antenna that uses a Y-shaped feed is proposed. The proposed antenna consists of a square patch, a Y-shaped feeding structure, a PIN diode, and a bias circuit for diode operation. The structural symmetry/asymmetry of the feeding structure is determined by the on/off operation of the PIN diode that inserted into the side of one of the lines of the Y-shaped feeding structure. For the proposed reconfigurable antenna, the two microstrip lines of the feeding structure have the same length when the PIN diode operates in the on state, and the antenna exhibits linear polarization(LP). On the other hand, when the PIN diode operates in the off state, the length of one side line of the feeding structure is relatively shorter than that of the other line. Therefore, the antenna exhibits circular polarization(CP). From the measurement results, it is found that the proposed antenna exhibits good impedance matching and axial ratio. In addition, polarization switching can be easily achieved in the same operating band.
Dual-Band Frequency Reconfigurable Small Eighth-Mode Substrate-Integrated Waveguide Antenna
Kang, Hyunseong ; Lim, Sungjoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 10~18
DOI : 10.5515/KJKIEES.2014.25.1.10
In this paper, we propose a new frequency reconfigurable dual-band antenna. By using an electronically compact eighth-mode substrate-integrated-waveguide(EMSIW) resonator, we have designed a compact antenna, which performs dual-band movement by additionally loading a complementary split ring resonator(CSRR) structure. The EMSIW and CSRR structures are designed to satisfy the bandwidths of 1.575 GHz(GPS) and 2.4 GHz(WLAN), respectively. We load the CSRR with a varactor diode to allow a narrow bandwidth and to enable the resonance frequency to continuously vary from 2.4 GHz to 2.5 GHz. Thus, we realize a channel selection function that is used in the WLAN standards. Irrespective of how a varactor diode moves, the EMSIW independently resonates so that the antenna maintains a fixed frequency of the GPS bandwidth even at different voltages. Consequently, as the DC bias voltage changes from 11.4 V to 30 V, the resonance frequency of the WLAN bandwidth continuously changes between 2.38 GHz and 2.5 GHz, when the DC bias voltage changes from 11.4 V to 30 V. We observe that the simulated and the measured S-parameter values and radiation patterns are in good agreement with each other.
Design of a Multiband Antenna for LTE System
Hong, Youngtaek ; Baek, Jisoo ; Choi, Jaehoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 19~24
DOI : 10.5515/KJKIEES.2014.25.1.19
In this paper, a multiband LTE antenna satisfying LTE octa-band is proposed. The proposed antenna consists of a modified PIFA structure and a folded monopole which has the height of 4 mm. Each parts operates at lower and upper LTE band. Measured bandwidth(6 dB return loss) was 118 MHz(870~988 MHz) at the lower band and 1,107 MHz(1,650~2,757 MHz) at the upper band. The proposed antenna has a omni-directional radiation pattern and measured peak gains were 3.21 dBi at the lower band and 4.19 dBi at the upper band, respectively. The proposed antenna is expected to be utilized for future LTE-advanced system.
Design of a Modified Alford Loop Antenna for On-Body Devices
Park, Joongki ; Lee, Juneseok ; Choi, Jaehoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 25~31
DOI : 10.5515/KJKIEES.2014.25.1.25
In this paper, a modified Alford loop antenna for on-body communication system is proposed. The proposed antenna operating in the ISM band is designed with consideration of human body effect. One of advantages of the Alford loop antenna structure is low-profile, however the Alford loop antenna is not suitable for on-body devices since it does not have a ground plane for other electronic part of on-body system and requires balanced feeding structure. To be embedded on on-body devices, the proposed antenna is design with the unbalanced feed structure and ground. The performance of the proposed antenna is simulated and measured when it is placed on the human body phantom to consider the effect of the human body. The proposed antenna a 10 dB return loss bandwidth over the ISM band and monopole-like radiation pattern with low-profile. The antenna has the surface of appropriate for on-body communication environment.
Design of Secant Pattern Radiator with Septum Circular Polarizer
Yim, Jung-Min ; Son, Jae-Ki ; Lee, Taek-Kyung ; Lee, Jae-Wook ; Lee, Woo-Kyung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 32~38
DOI : 10.5515/KJKIEES.2014.25.1.32
In this paper, we design a secant pattern antenna combined with a septum circular polarizer to be used in the satellite data communications. To generate a radiation pattern with secant type, Fourier relationship between current distribution and space factor is applied and the circular symmetric structure of the aperture simplifies the design. The optimization process is performed by combining the radiator with the septum circular polarizer, and it is confirmed that the designed radiation pattern, axial ratio, and return loss characteristics satisfies the required performance of the antenna.
Characteristics of On-Board Broadband Antenna for 2.4 GHz Band
Lee, Sang-Seok ; Lee, Young-Hun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 39~46
DOI : 10.5515/KJKIEES.2014.25.1.39
In this paper, to operate 2.4 GHz Inverted-L antenna with On-Board Broadband characteristics is proposed. The antenna was designed on the system board, the bandwidth by adjusting the reactance of the antenna that was formed common-mode and differential-mode on the antenna stubs has been improved. The system size is
, the size of the antenna was limited to
, the thickness of FR4 dielectric substrate is 0.8 mm, FR4 dielectric constant 4.4 is used. The experimental results, the bandwidth from 17.2 to 24.1 %, the gain is 3.01~4.71 dB, omni-directional radiation pattern characteristics were obtained. By a mobile terminal design applying the results of the paper, the handset`s price competitiveness and production efficiency can be improved.
Circuit Modeling and Analysis of Touch Screen Panel
Byun, Kisik ; Min, Byung-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 47~52
DOI : 10.5515/KJKIEES.2014.25.1.47
A simple RC circuit model of large-scale touch screen panels is developed and the frequency range of the RC model is analyzed. 2D EM simulation results of a single touch cell are cascaded for a 23 inch touch panel using a circuit simulator, and the shortest and longest channels of the full panel are modeled with a 5-element RC circuit. The 5-element RC circuit can model the touch screen panel upto 130 kHz with the channel phase error of
. 7-element RC circuit model is also proposed and the frequency range for the channel phase error of
is extended to 200 kHz.
High Efficiency GaN HEMT Power Amplifier Using Harmonic Matching Technique
Jin, Tae-Hoon ; Kwon, Tae-Yeop ; Jeong, Jinho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 53~61
DOI : 10.5515/KJKIEES.2014.25.1.53
In this paper, we present the design, fabrication and measurement of high efficiency GaN HEMT power amplifier using harmonic matching technique. In order to achieve high efficiency, harmonic load-pull simulation is performed, that is, the optimum load impedances are determined at
harmonic frequencies as well as at the fundamental. Then, the output matching circuit is designed based on harmonic load-pull simulation. The measurement of the fabricated power amplifier shows the linear gain of 20 dB and
(1 dB gain compression point) of 33.7 dBm at 1.85 GHz. The maximum power added efficiency(PAE) of 80.9 % is achieved at the output power of 38.6 dBm, which belongs to best efficiency performance among the reported high efficiency power amplifiers. For W-CDMA input signal, the power amplifier shows a PAE of 27.8 % at the average output power of 28.4 dBm, where an ACLR (Adjacent Channel Leakage Ratio) is measured to be -38.8 dBc. Digital predistortion using polynomial fitting was implemented to linearize the power amplifiers, which allowed about 6.2 dB improvement of an ACLR performance.
Study of Channel Model Characterization of Human Internal Organ in On-Body System at 2.45 GHz
Jeon, Jaesung ; Choi, Jaehoon ; Kim, Sunwoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 62~69
DOI : 10.5515/KJKIEES.2014.25.1.62
In this paper, WBAN(Wireless Body Area Network) On-body system using the surface-oriented antenna about the impact of human internal organs were analyzed through experiments. The received signal strength is measured for effect of human using the human model and the phantom of torso. Experiments are performed in anechoic chamber without moving and measured by Vector Network Analyzer. This paper confirms the effect of human body by comparing the human model and the phantom of torso. And also know the human internal organs effect on the antennas loss of received signal strength by measured data.
A 3~5 GHz Interferer Robust IR-UWB RF Transceiver for Data Communication and RTLS Applications
Ha, Jong Ok ; Park, Myung Chul ; Jung, Seung Hwan ; Eo, Yun Seong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 70~75
DOI : 10.5515/KJKIEES.2014.25.1.70
This paper presents a IR-UWB(Impulse Radio Ultra-Wide Band) transceiver circuit for data communication and real time location system. The UWB receiver is designed to OOK(On-Off Keying) modulation for energy detection. The UWB pulse generator is designed by digital logic. And the Gaussian filter is adopted to reject side lobe in transmitter. The measured sensitivity of the receiver is -65 dBm at 4 GHz with 1 Mbps PRF(Pulse Repetition Frequency). And the measured energy efficiency per pulse is 20.6 pJ/bit. The current consumption of the receiver and transmitter including DA is 27.5 mA and 25.5 mA, respectively, at 1.8 V supply.
Interference Avoidance Based on IEEE 802.15.4 MAC Layer between Heterogeneous Unlicensed Devices
Jang, Byung-Jun ; Kim, Seok-Hwan ; Yoon, Hyungoo ; Choi, Sunwoong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 76~82
DOI : 10.5515/KJKIEES.2014.25.1.76
In order for heterogeneous unlicensed devices to co-exist on the same frequency band, the frequency interference avoidance mechanism is necessary. In this paper, a frequency interference between WLAN and WPAN systems that operate at 2.4 GHz ISM band was analyzed in the MAC layer. We observed that WPAN systems suffer from severe interference from WLAN systems. To avoid this interference problem, we propose a new channel shift algorithm for WPAN systems. We showed that the proposed channel shift algorithm is better than the traditional WPAN system which uses a fixed channel in terms of throughput.
Read Range Reduction in Passive UHF RFID Tag by Smart Device Signal Interference
Kwon, Jongwon ; Song, Taeseung ; Cho, Wonseo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 83~91
DOI : 10.5515/KJKIEES.2014.25.1.83
The passive UHF RFID tags for item-level tagging are now explosively used in the supply chain and retail applications as they have several advantages, the two most relevant are cost and a longer read range. However, the signal interference problem between RFID tags and smart devices in real world is expected according to the smart-phone and tablet market growth together. The performance of RFID tags can be significantly less. The popular examples are the read-success rates and read range reduction. Especially, KT Corp. recently emphasized the serious signal interference at 900 MHz of LTE and old RFID frequencies through their public demonstration. By popular demands, this paper suggests the interference tolerance measurement method between the passive UHF RFID tag and the transmitted signal from a smart device. In addition, we selected three passive UHF RFID tags(Inlay) available on the market and quantitatively evaluated read range reduction results by interference signals using the PCR(Performance Change Rates) index. As a result, the LTE system is about three times as effective as the WCDMA system in terms of interference effects, and the read range performance of two RFID tags about 60 % drop.
Design of Reconfigurable Frequency Selective Surface Using Patch Array and Grid Structure
Lee, In-Gon ; Hong, Ic-Pyo ; Seo, Yun-Seok ; Chun, Heoung-Jae ; Park, Yong-Bae ; Cho, Chang-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 92~98
DOI : 10.5515/KJKIEES.2014.25.1.92
In this paper, the reconfigurable frequency selective surface for C-band was designed using patch array and grid structure. Frequency reconfigurability was obtained by varying the capacitance from varactor diode. From the optimized design parameters, we fabricated the reconfigurable frequency selective surface using the FPCB(Flexible Printed Circuit Board) and commercial varactor diode and measured the frequency reconfigurability for different bias voltage. From the measurement results, proposed structure has the wideband operating frequency of 6.6~7.6 GHz. We can applied this proposed structure to the smooth curved surface like as radome of aircraft or warship.
Development and Performance Test of Ka-Band Pulsed Doppler Radar System for Road Obstacle Warning
Jung, Jung-Soo ; Seo, Young-Ho ; Kwag, Young-Kil ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 99~107
DOI : 10.5515/KJKIEES.2014.25.1.99
Abruptly occurred obstacles on highway threaten driving safety. Radar draws the attention to the collision avoidance system because it can be fully operational in all weather, and day and night condition. This paper presents the design, implementation and performance test results of pulsed Doppler radar system for detection and warning of road obstacles. The system is designed to consider highway environment and detection capability about various fixed and moving obstacles. The system consists of 4 subsystems, which include antenna unit, transmitter and receiver unit, radar signal & data processing unit, and controller & display unit. The core technologies include clutter map based change detection for fixed obstacles detection, Doppler estimation for velocity detection of moving targets, and azimuth angle estimation method using monopulse for lane estimation and tracking. The design performance of the developed radar system is verified through experiments using a fixed reference target and moving vehicles in test highway.
Transmission Characteristics on Swelling Tolerances of Rectangular Waveguides for Q-Band
Park, Kyung-Sik ; Cho, Byung-Ho ; Kim, Ki-Chai ; Kang, Jin-Seob ; Kim, Jeong-Hwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 108~113
DOI : 10.5515/KJKIEES.2014.25.1.108
This paper presents the influence on the transmission characteristics of swelling in rectangular waveguides for Q-band. We derived the Green`s functions of the waveguide with eigenfunction expansion method. The reflection coefficient of the waveguide with a swelling is calculated by using internal impedance in order to investigate the influence of swelling in the waveguide. In order to check the validity of the theoretical analysis, the calculated reflection coefficients are compared with the measured results.
A Comparative Study on Interrelation between FDTD Source Models for Coaxial-Probe Feeding Structures
Hyun, Seung-Yeup ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 114~122
DOI : 10.5515/KJKIEES.2014.25.1.114
For an efficient finite-difference time-domain(FDTD) analysis of coaxial-probe feeding structures in radio frequency(RF) and microwave bands, an interrelation between equivalent source modeling techniques is investigated. In existing literature, equivalent source models with delta-gap or magnetic-frill concepts have been developed by many researchers. It is well known that FDTD implementation and computational accuracy of these source models are slightly different. In this paper, the interrelation between FDTD equivalent source models for coaxial feeding structures under the quasi-static approximation(QSA) is presented. As a function of FDTD equivalent source models, time-domain and frequency-domain responses of a coaxial-probe fed conical monopole antenna are calculated numerically. And comparison results of computational accuracy and efficiency are provided.
Analysis of an Altitude Detection Accuracy by a Weather Effect for Long Range and Multi Function Radar
Kwon, Sewoong ; Lee, Jong-Hyun ; Kwon, Yangwon ; Lee, Kiwon ; Kim, Han Seng ; Sun, Woong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 123~129
DOI : 10.5515/KJKIEES.2014.25.1.123
This paper presents an altitude detection accuracy for long range and multifunction radar. The accuracy is difficult to estimate because it is affected by an time varying atmosphere refractivity. We analyze altitude accuracy with a raytracing simulator with atmosphere refractivity. An altitude error is simulated with measured and modeled refractivity, and the modeled refractivity is used for compensate an altitude accuracy. As a result, the error is modeled with normal distribution function, and analyzed.
Silicon Based Millimeter-Wave Phased Array System
Kang, Dong-Woo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 1, 2014, Pages 130~136
DOI : 10.5515/KJKIEES.2014.25.1.130
This paper reviews the research on silicon based phased array system operating from microwave to millimeter wave frequencies. First, the design of phase shifter using CMOS technology is presented. The passive phase shifter is applied to the transmit/receive module from one to 16 channel in a single chip. The 35 GHz 4-element T/R module consumes less than 200 mW both transmit and receive modes. The architecture can extend to 16-channel operating at 44 GHz, thereby improving transmit power and linearity. The Ku-band 2-antenna 4-element receiver was developed using active phase shifter based on vector sum method. It is important to minimize coupling between beams because the chip contains four independent beams. The method of coupling is presented and verified.