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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 18, Issue 12 - Dec 2007
Volume 18, Issue 11 - Nov 2007
Volume 18, Issue 10 - Oct 2007
Volume 18, Issue 9 - Sep 2007
Volume 18, Issue 8 - Aug 2007
Volume 18, Issue 7 - Jul 2007
Volume 18, Issue 6 - Jun 2007
Volume 18, Issue 5 - May 2007
Volume 18, Issue 4 - Apr 2007
Volume 18, Issue 3 - Mar 2007
Volume 18, Issue 2 - Feb 2007
Volume 18, Issue 1 - Jan 2007
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Low Phase Noise Push-Push VCO Using Microstrip Square Open Loop Resonator and Tunable Negative Resistance
Choi, Jae-Won ; Seo, Chul-Hun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 847~853
DOI : 10.5515/KJKIEES.2007.18.8.847
In this paper, a novel push-push voltage-controlled oscillator(VCO) using microstrip square open loop resonator and tunable negative resistance is presented. The microstrip square open loop resonator has the large coupling coefficient value, which makes a high Q value, and has reduced phase noise of VCO. The VCO with 1.8V power supply has phase noise of
in the tuning range,
. The FOM of this VCO is
in the same tuning range. When it has been compared with single-ended VCO using microstrip square open loop resonator, and push-push oscillator using microstrip line resonator, the reduced phase noise has been -8.51dB, and -33.67dB, respectively.
Compact L Shape Shorted Pin Patch for Local Oscillator Port of X-, K-, Ka-Band Radar Detector
Ko, Seung-Tae ; Kim, Han-Yong ; Lee, Hyun-Taek ; Park, Jae-Kyu ; Lee, Jeong-Hae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 854~861
DOI : 10.5515/KJKIEES.2007.18.8.854
In this paper, a compact L-shaped shorted pin patch to be used at local oscillator port in radar detector is proposed. Shorted pin patch operates as short-open cavity while conventional patch operates as open-open cavity. Shorted pins are L-shaped to obtain quarter wave length and three-quarter wave length resonance for the fundamental(X-band) and
(K- and Ka-band) mode resonance frequency, respectively. Thus, the proposed patch can be compact. It is also possible to operate at triple band(X-, K-, Ka-band) with small return loss in radar detector, It is expected that shorted pin patch could improve radar detector sensitivity.
Tx-Leakage Signal Blocking System in RFID System
Jeon, Bu-Won ; Bae, Jae-Hyun ; Roh, Hyoung-Hwan ; Joung, Myoung-Sub ; Park, Jun-Seok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 862~865
DOI : 10.5515/KJKIEES.2007.18.8.862
Rx and Tx signal use same band in RFID. Then RFID system is not used duplexer and used coupler. RFID system have problem about Rx part to Tx leakage signal because that Rx signal port is Tx signal port's Isolation port. We proposal using phase shifter Tx leakage signal decrease than other RFID system. It is same signal Tx signal port's coupling port and isolation port signal except amplitude and phase. So if make coupling signal and isolation signal is in all same signal. We cancel Tx leakage signal used coupling port. And verification about ADS2006.
A Frequency Tunable and Compact Metamaterial Peano Antenna
Lee, Dong-Hyun ; Jang, Kyung-Duk ; Park, Wee-Sang ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 866~872
DOI : 10.5515/KJKIEES.2007.18.8.866
In this paper, we present a frequency tunable and compact antenna which consists of a first-order Peano curve, two shorting posts, and two inductors which are serially connected between the posts and the edge of the Peano curve. By properly choosing the inductance of two inductors, the operating frequency of the antenna can be controlled without sacrificing the fractional bandwidth. To give good demonstration of the operating mechanism, the equivalent circuit of this antenna is included. To validate the simulation results, we have fabricated the several antennas of being integrated with different inductors, and the measured results show a good agreement with the simulated ones. The measured results reveal that the operating frequency is shifted from 1.47 GHz to 0.586 GHz without the decrease of the input impedance bandwidth. In case of integrating two inductors of 91nH and 470nH, the electric size of the antenna is only
. The measured fractional bandwidth
and the radiation efficiency of the antenna are 5.22% and 47.25%, respectively.
Development of a 2.14-GHz High Efficiency Class-F Power Amplifier
Kim, Jung-Joon ; Moon, Jung-Hwan ; Kim, Jang-Heon ; Kim, Il-Du ; Jun, Myoung-Su ; Kim, Bum-Man ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 873~879
DOI : 10.5515/KJKIEES.2007.18.8.873
We have implemented a highly efficient 2.14-GHz class-F amplifier using Freescale 4-W peak envelope power(PEP) RF Si lateral diffusion metal-oxide-semiconductor field effect transistor(LDMOSFET). Because the control of the all harmonic contents is very difficult, we have managed only the
harmonics to obtain the high efficiency with simple harmonic control circuit. In order to design the harmonic control circuit accurately, we extracted the bonding wire inductance and drain-source capacitance which are dominant parasitic and package effect components of the device. And then, we have fabricated the class-F amplifier. The measured drain and power-added efficiency are 65.1 % and 60,3 %, respectively.
Advanced Hybrid EER Transmitter for WCDMA Application Using Efficiency Optimized Power Amplifier and Modified Bias Modulator
Kim, Il-Du ; Woo, Young-Yun ; Hong, Sung-Chul ; Kim, Jang-Heon ; Moon, Jung-Hwan ; Jun, Myoung-Su ; Kim, Jung-Joon ; Kim, Bum-Man ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 880~886
DOI : 10.5515/KJKIEES.2007.18.8.880
We have proposed a new "hybrid" envelope elimination and restoration(EER) transmitter architecture using an efficiency optimized power amplifier(PA) and modified bias modulator. The efficiency of the PA at the average drain voltage is very important for the overall transmitter efficiency because the PA operates mostly at the average power region of the modulation signal. Accordingly, the efficiency of the PA has been optimized at the region. Besides, the bias modulator has been accompanied with the emitter follower for the minimization of memory effect. A saturation amplifier, class
is built using a 5-W PEP LDMOSFET for forward-link single-carrier wideband code-division multiple-access(WCDMA) at 1-GHz. For the interlock experiment, the bias modulator has been built with the efficiency of 64.16% and peak output voltage of 31.8 V. The transmitter with the proposed PA and bias modulator has been achieved an efficiency of 44.19%, an improvement of 8.11%. Besides, the output power is enhanced to 32.33 dBm due to the class F operation and the PAE is 38.28% with ACLRs of -35.9 dBc at 5-MHz offset. These results show that the proposed architecture is a very good candidate for the linear and efficient high power transmitter.
Low-Pass Filter with Wide Stop-Band Characteristics Using Controllable Transmission Zeros
Lee, Geon-Cheon ; Kim, Yu-Seon ; Kim, Kyung-Keun ; Lee, Tae-Sung ; Na, Hyeon-Sik ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 887~894
DOI : 10.5515/KJKIEES.2007.18.8.887
In this paper, design and fabrication of the LPF with controllable four transmission zeros using electric coupling and added open stub is presented. Pass-band of the LPF is GSM band, and two transmission zeros are generated by the electric coupling at the WiBro and S-DMB band, And the other two transmission zeros are generated by the open stub at the upper frequencies. Harmonic frequency of the stop-band is suppressed by the realization of the filter using quasi-lumped element with small parasitic values.
, which is the electric coupling element of the equivalent circuit, is realized by the distance control between the open stubs of the filter structure. The fabricated LPF used teflon substrate with relative permittivity of 2.6. And it has a size of
, which is including a feed line. The measured 3 dB cut-off frequency is 1.55 GHz, and locations of the transmission zeros are 2.20, 2.43, 4.11 and 6.84 GHz, respectively.
Perfectly-Matched DC Blocks Terminated in Arbitrary Impedances
Ahn, Hee-Ran ; Kim, Bum-Man ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 895~903
DOI : 10.5515/KJKIEES.2007.18.8.895
Design equations of DC blocks terminated in arbitrary impedances are newly suggested and a microstrip DC block is tested for the perfect matching. The DC block is a two-port passive component and the power excited at a port is transmitted into another port. However, all the excited power at the input can not be delivered to the output and therefore most of the conventional DC blocks can not be perfectly matched with arbitrary termination impedances. To solve the matching problem, its one-port equivalent resonant circuit model, front which design equations can be derived, is newly suggested. Using the derived design equations, any DC block can be designed, perfectly matched without any restriction of coupling coefficients. To verify the derived design equations, measurements were carried out and the results are in good agreement with prediction, showing insertion and return losses at 4.1 GHz are 0.82dB and -31dB, respectively.
Design of a V/UHF-Band Broadband 4-Way Power Divider
Park, Yeo-Il ; Ko, Jin-Hyun ; Ha, Jae-Kwon ; Park, Young-Joo ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 904~912
DOI : 10.5515/KJKIEES.2007.18.8.904
In this paper, a broadband 4-way power divider which can be used from 20 MHz to 500 MHz in the V/UHF band is designed using transmission-line transformer and ferrite toroid. A 4:1 impedance transformer is realized and this 4:1 transformer is connected with bridge-type 2-way dividers to form a 4-way rower divider, Insertion loss of about 6.8dB, isolation of less than -20dB, and return loss of less than -15dB in most band of interest are measured.
Design of Small Antennas for Direction Finding Applications
Cho, Chi-Hyun ; Oh, Seung-Sub ; Choo, Ho-Sung ; Park, Ik-Mo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 913~921
DOI : 10.5515/KJKIEES.2007.18.8.913
In this paper, we propose a novel small antenna for direction finding applications. The proposed antenna employs a skirt type disk to eliminate the radiation null on the broad-side direction in the high frequency range. Additionally, the multi-section matching stub is used for impedance matching in the low frequency range, The size of the proposed antenna is reduced as a half of the 60cm dipole which has a same resonance frequency of 200MHz. The antenna maintains a donut shape radiation pattern with a broad beam width for a wide range of frequency while the 60cm dipole shows radiation nulls on the broad-side direction and the high side-lobe level from 700MHz to 1,300MHz.
Design of a Rectangular Loop Array Antenna for Beam Scanning
Koo, Han-Ni ; Han, In-Hee ; Kim, Dong-Seok ; Kim, Chan-Hong ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 922~929
DOI : 10.5515/KJKIEES.2007.18.8.922
In this paper, a rectangular loop array antenna for beam scanning is designed. A program using RWG MoM(Rao Wilton Glisson Method of Moment) is developed for SEP(Scan Element Pattern) theoretically. Simulation results obtained by using a commercial software tool, MWS are compared with the MoM results to confirm the validity of the program. Also these results are compared with the measured ones for the case of an
subarray. The fabricated
subarray showed a flat gain characteristic in the elevation scan range of
in the E-plane.
High Gain and Broadband SAP Antenna with Two Parasitic Patches
Kim, Jung-Han ; Kim, Yong-Jin ; Lee, Hong-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 930~936
DOI : 10.5515/KJKIEES.2007.18.8.930
In this paper, the high gain and broadband antenna operating for SDMB(Satellite Digital Multimedia Broadcasting) system is realized, The proposed antenna consists of the SAP(Shorted Annular Patch) structure, which inhibits surface-wave and the parasitic SAP element with spacing of
in order to improve gain, bandwidth and directivity. The RHCP(Right Hand Circular Polarization) is generated by two slits, which are made along the periphery of the circular patch at the diametrically opposite points, The simulated maximum gain of the proposed antenna is 12.6 dBi, which is better 5.22 dBi than maximum gain of the conventional microstrip patch antenna. The measured maximum gain is 10.5dBi at operating frequency 2.63GHz. Also, the measured impedance bandwidth
of the proposed antenna is
, which is better 300 MHz than the bandwidth of the conventional microstrip patch antenna. The measured HPBW(Half Power Beam Width) of the proposed antenna is
, and the measured FBR(Front to Back Ratio) is 15.49 dBi, The 3dB axial ratio bandwidth is 220 MHz
A Design of Quasi-Yagi Antenna Using the New Ultra-Wideband Microstrip-to-CPS Transitions
Woo, Dong-Sik ; Kim, Young-Gon ; Cho, Young-Ki ; Kim, Kang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 937~942
DOI : 10.5515/KJKIEES.2007.18.8.937
A new, systematic, simplified design procedure for quasi-Yagi antennas is presented. The design is based on the simple impedance matching among antenna components: i.e., transition, feed, and antenna. This new antenna design is possible due to the newly developed ultra-wideband transition. As design examples, wideband quasi-Yagi antennas are successfully designed and implemented in Ku- and Ka-bands with frequency bandwidths of 53.2% and 29.1%, and antenna gains of
, respectively. The design method can be applied to other balanced antennas and their arrays.
Design of Ka-band Feed Horn and Cassegrain Antenna
Ahn, Seung-Beom ; Choo, Ho-Sung ; Kang, Jin-Seob ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 943~953
DOI : 10.5515/KJKIEES.2007.18.8.943
In this paper, we propose a Cassegrain antenna with a scalar feed horn opt rating in Ka-band. For an effective EM simulation of the Cassegrain antenna, the near-field of the feed hone is used ai the equivalent source of the Cassegrain antenna using the surface equivalent theorem. A corrugated circular horn operating with
mode is used as the feed horn. The angle and feed center of the main and sub reflectors are optimized to achieve maximum antenna efficiency. The designed feed horn shows the gain of 19dBi, the side-lobe level of less than -25dB and the half power beam width of
at 33 GHz. The Cassegrain antenna shows the gain of 41dBi, the efficiency of 60%, the side-lobe level of less than -20dB and the half power beam width of
An Implementation of a RFID Reader System for EPC Class-1 Generation-2 Specification
Yang, Jung-Kyu ; Bae, Sung-Woo ; Song, Eui-Seok ; Ahn, Si-Young ; Oh, Ha-Ryoung ; Seong, Yeong-Rak ; Park, Jun-Seok ; Joung, Myoung-Sub ; Kwak, Ho-Kil ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 954~963
DOI : 10.5515/KJKIEES.2007.18.8.954
As RFID systems are applied to various fields and applications such as supply chain management, asset management, location based applications etc. the requirements becomes diverse. For example, Much higher performance, TCP/IP protocol stack are required in some applications. However, low end processors based systems such as 8051 processor can not meet such requirements due to their low processing capacity and limited size of memory. In this paper a UHF band RFID system which meets the EPC Class-1 Generation-2 specification with ARM920T-based processor is implemented and tested.
Design of Regulated Low Phase Noise Colpitts VCO for UHF Band Mobile RFID System
Roh, Hyoung-Hwan ; Park, Kyong-Tae ; Park, Jun-Seok ; Cho, Hong-Gu ; Kim, Hyoung-Jun ; Kim, Yong-Woon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 964~969
DOI : 10.5515/KJKIEES.2007.18.8.964
A regulated low phase noise differential colpitts VCO(Voltage Controlled Oscillator) for mobile RFID system is presented. The differential colpitts VCO meets the dense reader environment specifications. The VCO use a
technology and achieves tuning range
. Measuring 910 MHz frequency divider output, phase noise performance is -106 dBcMz and -135dBc/Hz at 40 kHz and 1MHz offset, respectively. 5-bit digital coarse-tuning and accumulation type MOS varactors allow for 28.2% tuning range, which is required to cover the LO frequency range of a UHF Mobile RFID system, Optimum design techniques ensure low VCO gain(<45 MHz/V) for good interoperability with the frequency synthesizer. To the author' knowledge, this differential colpitts VCO achieves a figure of merit(FOM) of 1.93dB at 2-GHz band.
Novel Polar Transmitter with 2-Bit Sigma-Delta Modulation
Lim, Ji-Youn ; Cheon, Sang-Hoon ; Kim, Kyeong-Hak ; Hong, Song-Cheol ; Kim, Dong-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 970~976
DOI : 10.5515/KJKIEES.2007.18.8.970
This paper presents a novel polar transmitter architecture with a 2-bit sigma-delta modulator. In the proposed architecture, the 2-bit sigma-delta modulator is introduced to suppress quantization noise of conventional sigma-delta modulator. The power amplifier configuration is also modified in a binary form to accommodate the 2-bit digitized envelope signal. The Ptolemy simulation results of the proposed structure show that the spectral property is greatly improved in full transmit band of EDGE system. The fine quantization scheme of the 2-bit modulator lowers the noise level by 10dB without increasing the over-sampling ratio, which may be obtained if the over-sampling ratio increases twofold. Dynamic range is also enhanced up to 5dB owing to the new form of the power amplifier in the transmitter.
Field Analysis in the Ferrite Core at 100 kHz Band Magnetic Field
Koo, Bon-Chul ; Yoo, Jae-Sung ; Kim, Mi-Ja ; Gimm, Yoon-Myoung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 977~983
DOI : 10.5515/KJKIEES.2007.18.8.977
Recently, the number of systems which utilize wireless power transmission to a receiving module in a short distance is increasing. For efficient use of receiving space, coils are wound around the ferrite core to produce electromotive force(emf) in suppling power by wireless transmission. This paper analyzed the magnetic flux density distribution in the ferrite core in magnetic field environment which is uniformly oriented along to a single axis at 125kHz. For numerical analysis, Ansoft Maxwell which is applying the FEM(Finite Element Method) method was used. We studied the variations of the gathered magnetic fluxes to the changes of the relative permeabilities of the ferrite cores. Also we calculated the magnetic flux variation by shaving the ferrite core off for the groove of coil winding. Results showed that using a small ferrite core in magnetic field at 100kHz band can increase the amount of magnetic flux
than without the core. The magnetic flux decreased 23% by shaving the core 0.5 mm on the periphery of 4.75 mm radius core with the relative permeability 800.
Performance Improvement for 2-D Scattering Center Extraction and ISAR Image Formation for a Target in Radar Target Recognition
Shin, Seung-Yong ; Lim, Ho ; Myung, Noh-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 984~996
DOI : 10.5515/KJKIEES.2007.18.8.984
This paper presents techniques of 2-D scattering center extraction and 2-B ISAR(Inverse SAR) image formation for scattering wave which is scattered by a target. In general, 2-D IFFT is widely used to obtain 2-D scattering center and ISAR image of targets. But, this method has drawbacks, that is poor in a resolution aspect. To overcome these shortcomings with the FT(Fourier Transform)-based method, various techniques of high resolution signal processing were developed. In this paper, algorithms of 2-D scattering center extraction and ISAR image formation such as 2-D MEMP(Matrix Enhancement and Matrix Pencil), 2-D ESPRIT(Estimation of Signal Parameter via Rotational Invariance Techniques) are described. In order to show the performances of each algorithm, we use scattering wave of the ideal point scatterers and F-18 aircraft to estimate 2-D scattering center and abtain 2-D ISAR image.
Simulator for High Resolution Synthetic Aperture Radar Image Formation and Image Quality Analysis
Jung, Chul-Ho ; Oh, Tae-Bong ; Kwag, Young-Kil ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 8, 2007, Pages 997~1004
DOI : 10.5515/KJKIEES.2007.18.8.997
High resolution synthetic aperture radar image could be sensitive to the various parameters of the payload, platform, and ground system. In this paper, a parameter based SAR simulator is presented for two-dimensional image formation and image quality analysis. Functional modules are implemented by Matalb code and GUI for the flexibility and expandability. Main function of this simulator includes the SAR input signal generation, range-doppler algorithm(RDA) based SAR image formation, and the SAR image quality analysis which is relevant to the SAR system design parameters. This simulator can effectively be used for the SAR image quality performance evaluation, which can be applicable to the airborne as well as spaceborne SAR system design and analysis.