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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal 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 10, Issue 4 - Dec 2010
Volume 10, Issue 3 - Sep 2010
Volume 10, Issue 2 - Jun 2010
Volume 10, Issue 1 - Mar 2010
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Antenna Design with Combination of Electric-Magnetic Radiators for RFID System
Kim, Yong-Jin ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 79~85
DOI : 10.5515/JKIEES.2010.10.3.079
In this paper, a directive antenna design with a combination of electric-magnetic radiators for an radio frequency identification(RFID) system is presented. To generate a directive antenna radiation pattern, a structure combining a dipole and loop antenna is presented. A reader antenna and tag antenna are proposed for the RFID system. For the reader antenna, the frequency bandwidth defined by
<-10 dB is approximately from 820~990 MHz. The forward and backward gain differences are 1.5~2 dBi. For the tag antenna, the frequency bandwidth is approximately from 860~920 MHz with a maximum gain of 3.58 dBi at 910 MHz. In both cases, directive radiation characteristics are observed.
Double-Layered Frequency Selective Surface Superstrate Using Ring Slot and Dipole-Shaped Unit Cell Structure
Lee, Hong-Min ; Kim, Yong-Jin ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 86~91
DOI : 10.5515/JKIEES.2010.10.3.086
In this paper, a double-layered frequency selective surface(FSS) superstrate was built and tested. The unit cell of the proposed FSS consists of a ring slot and a dipole-shaped structure and shows a complementary frequency response. Each unit cell is printed on two sides of a substrate. By using these double-layered structures, the first resonant frequency of the pass-band can be lowered. As a result, the size of the unit cell is minimized and the spacing between the other cells is reduced. The proposed FSS-dipole composite antenna is designed for the gain enhancement of wide-band code division multiple access(WCDMA) frequency bands(1.92~2.17 GHz) with a low quality factor(Q=0.17). To verify the gain enhancement performance of the FSS, an FSS-dipole composite antenna was created. Although the FSS layer enhances the gain of the primary radiation source of the dipole antenna, the FSS-dipole complex antenna cannot show a uniform gain over the entire desired frequency band. The experimental results show a gain enhancement of 3 dBi with an FSS superstrate in the WCDMA frequency band.
Wideband Bandstop Filter Based on Capacitively Coupled λ/4 Short-Circuited Lines
Duong, Thai Hoa ; Kim, Ihn-Seok ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 92~98
DOI : 10.5515/JKIEES.2010.10.3.092
A new wideband bandstop filter(BSF) with a sharp roll-off characteristic is introduced in a stripline structure in this paper. The BSF consists of two sections: the first is two capacitively coupled
short-circuited lines with opposite ground positions, while the second is a capacitively coupled
short-circuited line. The BSF provides three transmission zeros within the stopband and better than 22 dB rejection over the whole wireless local area network (WLAN) band from 5.15 to 5.825 GHz. The BSF, cascaded to an U.S. ultra-wideband(UWB: 3.1~10.6 GHz) band-pass filter(BPF), is simulated with HFSS and realized with low-temperature co-fired ceramic(LTCC) green tape with a dielectric constant of 7.8. The measurement results agree well with the HFSS simulation results. The size of the UWB BPF including the BSF is
On the Capacities of Spectrum-Sharing Systems with Transmit Diversity
Asaduzzaman, Asaduzzaman ; Kong, Hyung-Yun ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 99~103
DOI : 10.5515/JKIEES.2010.10.3.099
Motivated by recent works on spectrum-sharing systems, this paper investigates the effects of transmit diversity on the peak interference power limited cognitive radio(CR) networks. In particular, we derive the ergodic and outage capacities of a spectrum-sharing system with multiple transmit-antennas. To derive the capacities, peak interference power constraint is imposed to protect the primary receiver. In a CR transmitter and receiver pair with multiple antennas at the transmitter side, the allowable transmit power is distributed over the transmit-antennas to achieve transmit diversity at the receiver. We investigate the effect of this power distribution when a peak interference power constraint is imposed to protect the primary receiver. We show that the transmit diversity does not improve the ergodic capacity compared to the single-antenna system. On the other hand, the transmit diversity significantly improves the outage capacity. For example, two transmit-antennas improve the outage capacity 10 times compared to the single-antenna with a 0 dB interference constraint.
On the Coexistence among WiMAX-TDD, TD-LTE, and TD-SCDMA
Cho, Bong-Youl ; Kim, Jin-Young ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 104~116
DOI : 10.5515/JKIEES.2010.10.3.104
With several advantages such as flexible downlink-to-uplink(DL-to-UL) ratio and flexible spectrum usage, Time Division Duplexing(TDD) is emerging as an alternate to Frequency Division Duplexing(FDD), especially in wireless broadband systems. We already have at least four different TDD systems in the industry: Time Division-Synchronous Code Division Multiple Access(TD-SCDMA), IEEE 802.16e-TDD, IEEE 802.16m-TDD, and Time Division-Long Term Evolution(TD-LTE). A disadvantage of TDD is that tight coordination such as time synchronization between adjacent operators is required to prevent interference between the adjacent TDD systems. In this paper, we investigate coexistence scenarios among the above four well-known TDD systems and calculate spectral efficiency(SE) loss in each scenario. Our findings are that SE loss can be significant if TDD ratios of the adjacent operators are considerably different. However, as long as the TDD ratios of the adjacent operators are similar, configurations in the systems permit perfect time synchronization between the two heterogeneous TDD systems, and the resulting SE loss is zero or reasonably low. We believe that the above findings and the configurations of the TDD systems recommended tominimize SE loss will be helpful for operators who deploy TDD systems in system parameter determination and cross-operator coordination.
A Novel Stepped-Patch Loaded CPW and Its Application to a Low-Pass Filter
Park, Jong-Kuk ; Na, Hyung-Gi ; Lim, Jong-Sik ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 117~120
DOI : 10.5515/JKIEES.2010.10.3.117
A novel stepped-patch loaded coplanar waveguide(SPLCPW) structure is proposed and applied to the design of a low-pass filter(LPF). The stepped-patch loaded on the opposite side of the CPW plane is shown to provide a shunt-connected series L-C resonance, which is dual to that of a conventional CPW defected ground structure(DGS). As a simple example of the proposed SPLCPW circuit, a 3-pole SPLCPW LPF is designed and good results are obtained.
Long Range UHF RFID Tag with a Rectangular Metallic Cavity Structure
Yeo, Jun-Ho ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 121~126
DOI : 10.5515/JKIEES.2010.10.3.121
A long range UHF RFID tag with a rectangular metallic cavity structure is proposed for various applications with metallic objects. The proposed tag consists of a rectangular metallic cavity structure and a folded dipole antenna which is located on top of the cavity. The tag is designed for Korean UHF RFID band(910~914 MHz) and the bandwidth, which satisfies the -10 dB input reflection coefficient requirement, is approximately 1.3 %(904~916 MHz). Measurement demonstrates that the proposed tag shows long reading range up to 15 m when it is placed on a metallic plate.
Resonant Transmission through Slits in a Cavity inside a Thin Conducting Plane
Lee, Jong-Ig ; Cho, Young-Ki ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 127~131
DOI : 10.5515/JKIEES.2010.10.3.127
In this paper, the problem of electromagnetic transmission via slits in a cavity inside a conducting screen of finite thickness has been considered in the case that the transverse electric(to the slit axis) polarized plane wave is incident on a slit. The problem is solved numerically by the method of moments and the results are compared with those obtained from an equivalent circuit suitable for a case in which the slit width is infinite and the structure is modified to the two partially overlapped conducting planes. It is observed that when the cavity is resonated, the effective slit width reaches its maximum value of
wavelengths, irrespective of the actual slit width and the incidence angle. When the thickness of the conducting plane is much smaller than the wavelength, the numerical results for the effective slit width(or transmission width) agree well with those obtained from the equivalent circuit, even though the slit is as narrow as the thickness of the conducting plane.
Wide-Band Measurements of Antenna-Coupled Microbolometers for THz Imaging
Tamminen, Aleksi ; Ala-Laurinaho, Juha ; Mallat, Juha ; Luukanen, Arttu ; Grossman, Erich N. ; Raisanen, Antti V. ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 132~137
DOI : 10.5515/JKIEES.2010.10.3.132
We present results of room-temperature characterization of lithographically manufactured antenna-coupled NbN micro-bolometers. The bolometers are assembled together with a hyper-hemispherical Si lens to couple the incident radiation to the bolometer from the back-side of the substrate. The bolometers are designed to operate at 300~1,000 GHz and they are characterized at 321~782 GHz. Radiation patterns are measured at 321 GHz, 400 GHz, 654 GHz, and at 782 GHz. The frequency dependency of the beamwidth is studied with several azimuthal beam profile measurements at 321~500 GHz.
Demonstration of Adaptive Analogue Beam Forming in the E-Band
Dyadyuk, Val ; Stokes, Leigh ; Nikolic, Nasiha ; Weily, Andrew R. ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 138~145
DOI : 10.5515/JKIEES.2010.10.3.138
In this paper, we report the test results of a small-scale prototype that implements an analogue-beam-formed phased antenna array in the E-band. A four-channel dual-conversion receive RF module for 71~76 GHz frequency band has been developed and integrated with a linear end-fire antenna array. Measured performance is very close to the simulated results. An ad-hoc wireless communication system has also been demonstrated. Low BER was measured for an 8PSK data stream at 1.5 Gbps with the receive array beam formed in the direction of arrival of the transmitted signal. To our knowledge this is the first steerable antenna array reported to date in the E-band.
Compact & Contact Quad-Band(DVB-H UHF/L, WLAN 11 a/b) Antenna for PMP Applications
Yang, Chan-Woo ; Yeum, In-Su ; Jung, Chang-Won ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 146~149
DOI : 10.5515/JKIEES.2010.10.3.146
The quad-band antenna, which is composed of two compact dual-band antennas, is presented for potable media player(PMP) applications. The antenna for the broadcasting dual-band(DVB-H UHF; 470-862 MHz, L; 1452-1492 MHz) is composed of a planar inverted F-shaped antenna(PIFA) with an input matching circuit. The antenna for the communication dual-band(WLAN 11 b; 2.4~2.5 GHz, 11 a; 5.15~5.8 GHz) is composed of a folded dipole antenna with enhanced mutual coupling. The proposed antennas are contact with the PMP case(
=3.2) which is used as a substrate for the compact design.
Wideband 4×8 Array Antennas with Aperture Coupled Patch Antenna Elements on LTCC
Jun, Dong-Suk ; Bondarik, Alexander ; Lee, Hong-Yeol ; Ryu, Han-Cheol ; Paek, Mun-Cheol ; Kang, Kwang-Yong ; Choi, Ik-Guen ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 150~157
DOI : 10.5515/JKIEES.2010.10.3.150
We proposed a
array antenna with aperture-coupled patch antenna elements. The antenna was designed for 60 GHz operation and fabrication on the low-temperature cofired ceramic(LTCC) substrate(
=5.8). The feedline with the stub was designed to enhance the radiating element bandwidth and the transition characteristics between the waveguide (WG) and microstrip line(MSL). Through the optimization of the antenna and feedline geometry, the antenna gain and the performance of the 10 dB bandwidth were 20.2 dBi and 13 % up, respectively. The measured results agreed with the simulated ones.
Terahertz Time Domain Spectroscopy, T-Ray Imaging and Wireless Data Transfer Technologies
Paek, Mun-Cheol ; Kwak, Min-Hwan ; Kang, Seung-Beom ; Kim, Sung-Il ; Ryu, Han-Cheol ; Choi, Sang-Kuk ; Jeong, Se-Young ; Kang, Dae-Won ; Jun, Dong-Suk ; Kang, Kwang-Yong ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 158~165
DOI : 10.5515/JKIEES.2010.10.3.158
This study reviewed terahertz technologies of time domain spectroscopy, T-ray imaging, and high rate wireless data transfer. The main topics of the terahertz research area were investigation of materials and package modules for terahertz wave generation and detection, and setup of the terahertz system for time domain spectroscopy(TDS), T-ray imaging and sub-THz wireless communication. In addition to Poly-GaAs film as a photoconductive switching antenna material, a table-top scale for the THz-TDS/imaging system and terahertz continuous wave(CW) generation systems for sub-THz data transfer and narrow band T-ray imaging were designed. Dielectric properties of ferroelectric BSTO(
) films and chalcogenide glass systems were characterized with the THz-TDS system at the THz frequency range. Package modules for terahertz wave transmitter/receiver(Tx/Rx) photoconductive antenna were developed.
Scattering Model for Electrical-Large Target Employing MLFMA and Radar Imaging Formation
Wu, Xia ; Jin, Yaqiu ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 166~170
DOI : 10.5515/JKIEES.2010.10.3.166
To numerically calculate electromagnetic scattering from the electrical-large three-dimensional(3D) objects, the high-frequency approaches have been usually applied, but the accuracy and feasibility of these geometrical and physical optics(GO-PO) approaches, to some extent, are remained to be improved. In this paper, a new framework is developed for calculation of the near-field scattering field of an electrical-large 3D target by using a multilevel fast multipole algorithm(MLFMA) and generation of radar images by using a fast back-projection(FBP) algorithm. The MPI(Message Passing Interface) parallel computing is carried out to multiply the calculation efficiency greatly. Finally, a simple example of perfectly electrical conducting(PEC) patch and a canonical case of Fighting Falcon F-16 are presented.
Substrate Integrated Waveguide Power Divider Fed Dual-Dipole Array Antenna
Yu, Chen ; Hong, Wei ; Kuai, Zhenqi ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 171~174
DOI : 10.5515/JKIEES.2010.10.3.171
In the paper, a printed dual-dipole array antenna is presented. A 4-way planar SIW power divider is adopted for feeding the array antenna. The dual-dipole is adopted as radiation elements which greatly improves the impedance band. The measured bandwidth larger than 31 % for VSWR
1.5 operating near 14 GHz is achieved and in agreement with the simulated results. The radiation E-plane and H-plane radiation pattern is presented in the paper. The radiation gain is also presented in the paper.
A SIW Fed Antipodal Linear Tapered Slot Planar Multi-Beam Antenna for Millimeter-Wave Application
Zhang, Yingsong ; Hong, Wei ; Kuai, Zhenqi ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 175~178
DOI : 10.5515/JKIEES.2010.10.3.175
In this paper, a millimeter-wave multi-beam antenna is studied by rotating the antipodal linear tapered slot antenna(ALTSA) with respect to a center is successfully designed. In order to lowering the SLL and enhancing the isolation between the ALTSA elements, a row of metallic via is inserted between the ALTSAs. A 9 beams antenna is designed and experimented at Ka band. The measured and simulated results agree well with each other. The antenna can provide horizontal wide angle coverage up to
. The gain of each beam can achieve about 12.5 dB. The mutual coupling between ports is all below 20 dB.
Novel Compact Bandpass Filter Based on Folded Half Mode Substrate Integrated Waveguide Cavities
Gong, Ke ; Hong, Wei ; Chen, Jixin ; Tang, Hongjun ; Hou, Debin ; Zhang, Yan ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 179~182
DOI : 10.5515/JKIEES.2010.10.3.179
This paper proposed a novel compact bandpass filter with folded half mode substrate integrated waveguide (FHMSIW) cavities using two-layer printed circuit board(PCB) process. The area of the FHMSIW filter is reduced by nearly 50 % and 75 % compared with half mode substrate integrated waveguide(HMSIW) filter and substrate integrated waveguide(SIW) filter, respectively. A four-pole Chebyshev FHMSIW bandpass filter at C-band has been designed, simulated and fabricated. Measured results are presented and found to agree with the full-wave simulated results by using Ansoft HFSS. The filter shows good performance and compact size.
Dual-Polarized Annular Ring Patch Antenna for 2.4 GHz Doppler Radar
Kim, Seong-Ho ; Yook, Jong-Gwan ; Cho, Sung-Ho ; Jang, Byung-Jun ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 183~185
DOI : 10.5515/JKIEES.2010.10.3.183
A 2.4 GHz dual-polarized antenna for a Doppler radar is studied. The proposed dual-polarized antenna using a stacked annular ring patch with two co-centric gap-coupled feed lines and a
hybrid exhibits fairly good performance of 22 dB isolation at a center frequency of 2.4 GHz. Using a
hybrid, a right-handed circular polarization for the transmitter and a left-handed circular polarization for the receiver are implemented. The gain of the designed antenna is about 0 dBi over operating frequencies. The antenna size including a ground plane is only
Experimental Investigation of R(ω), T(ω) and L(ω) for Multi-Layer SRRs and Wires Metamaterials
Luo, Hao ; Wang, Xian ; Liao, Zhangqi ; Wang, Tao ; Gong, Rongzhou ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 186~189
DOI : 10.5515/JKIEES.2010.10.3.186
)) and loss(L(
)) characteristics of multi-layer metamaterials are investigated experimentally in free space with the incident EM waves perpendicular to the substrate plane. The sample is made of split-ring resonators(SRRs) and wires which are the typical model of metamaterials. The R(
) and T(
) of multi-layer metamaterials have been calculated from the measured S-parameters. In this paper, we got the impedance-matched result according to the curves of R(
), meanwhile the T(
) decreased with increasing number of layers. At last, we attained the result that the L(
) gets to nearly 98% around 8 GHz, with R(
)=0. The design presented in this paper achieves experimented loss near unity.
An Analysis of Combining Methods in Cooperative Spectrum Sensing over Rayleigh Fading Channel
Truc, Tran Thanh ; Kong, Hyung-Yun ;
Journal of electromagnetic engineering and science, volume 10, issue 3, 2010, Pages 190~198
DOI : 10.5515/JKIEES.2010.10.3.190
This paper evaluates the performance of two methods of spectrum sensing: the linear combining method and the selection combining method which is based on maximum SNR of sensing channel. We proposed a rule for global detection for the purpose of combating hidden terminal problems in spectrum sensing. Our analysis considers a situation when sensing channels experience the non-identically, independently distributed(n.i.d) Rayleigh fading. The average probabilities of global detection in these methods are derived and compared. In the scope of this paper, the reporting channels are assumed to be the AWGN channel with invariant and identical gain during the system's operation.