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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 19, Issue 12 - Dec 2008
Volume 19, Issue 11 - Nov 2008
Volume 19, Issue 10 - Oct 2008
Volume 19, Issue 9 - Sep 2008
Volume 19, Issue 8 - Aug 2008
Volume 19, Issue 7 - Jul 2008
Volume 19, Issue 6 - Jun 2008
Volume 19, Issue 5 - May 2008
Volume 19, Issue 4 - Apr 2008
Volume 19, Issue 3 - Mar 2008
Volume 19, Issue 2 - Feb 2008
Volume 19, Issue 1 - Jan 2008
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Design of the Miniaturaized UHF Bandpass Filter with the Wide Stopband Using the Inductive-Coupling Inverters and Metamaterials
Ju, Jeong-Ho ; Kahng, Sung-Tek ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 95~101
DOI : 10.5515/KJKIEES.2008.19.2.095
This paper presents a novel bandpass filter design method for suppressing spurious response in the GSM band and effectively reducing the overall size with the unbalanced-conditioned metamaterials. Compared to the conventional bandpass filters based on half-or quarter-wave resonators, the CRLH(composite right/left-handed) bandpass filter works excellently in harmonic-suppression by 40
50 dB and 80 %-miniaturization using the zero-order resonators bridged by Inductive-coupling Inverters suggested first time. The proposed technique, with the equivalent circuit and dispersion diagram, is validated by performance predictions and experiments.
Design of the Novel Compact UWB Bandpass Filters Using the SIR-Type Transversal Structure
Kahng, Sung-Tek ; Ju, Jeong-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 102~106
DOI : 10.5515/KJKIEES.2008.19.2.102
A new compact UWB bandpass filter with sharp-rejection, low insertion-loss and flat group-delay is developed In this paper, using the transversal filtering combined with SIR(stepped impedance resonator) concept. To form the required passband, multiple out-of-band transmission zeros are created around band-edges, securing very low insertion loss in the very wide frequency range. Also it is found to be beneficial to realize a sharp rejection of higher order with a relatively small overall size and simultaneously have very smoothly varying group-delay which is proper for the UWB applications. The validity of the proposed technique is proven theoretically and experimentally.
Half Wavelength Partial H-Plane Filter with Inverters having Attenuation Poles
Kim, Dong-Jin ; Lee, Jeong-Hae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 107~113
DOI : 10.5515/KJKIEES.2008.19.2.107
This paper presents half wavelength partial H-plane filters with multiple attenuation poles using narrow H-plane slot of evanescent waveguide. The narrow H-plane slot operates as an admittance inverter o( the bandpass filter and, simultaneously, generates an attenuation pole at particular frequency. Therefore, proposed filters with attenuation poles are simply implemented without any additional coupling and extra modification of the structure. The number of attenuation poles of the filters equals to that of the H-plane slots. Moreover, proposed filters are compact waveguide filter since ones are embodied by partial H-plane waveguide which has 1/4 cross section of conventional waveguide. The third and fourth-order half wavelength filters having 4 and 5 attenuation poles, respectively, are designed in H-band and their frequency responses are confirmed by simulation and measurement.
A Band Pass Filter with Feeding Structure Using π-Type Transmission Line
Bae, Ju-Seok ; Lim, Jong-Sik ; Kim, Kwi-Soo ; Ahn, Dal ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 114~120
DOI : 10.5515/KJKIEES.2008.19.2.114
This paper proposed the band pass filter(BPF) with feeding structure using
-type transmission line by means of transforming the input/output coupled-lines of the half wavelength parallel coupled-line BPF into K-inverter, then substituting
-type transmission line equivalence for K-inverter. The proposed method supplies solution with what the half wavelength parallel coupled-line BPF`s input/output coupled-lines are realized. Also it can quite reduce efforts and time needed to optimize filter performance when is compared to reported method using tapped line structure because formulas is very simple and accurate. On the basic of the proposed method, the BPF with feeding structure using
-type transmission line has been designed and fabricated. The validity of proposed method was proven by the measured result.
Fast Analysis of Fractal Antenna by Using FMM
Kim, Yo-Sik ; Lee, Kwang-Jae ; Kim, Kun-Woo ; Oh, Kyung-Hyun ; Lee, Taek-Kyung ; Lee, Jae-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 121~129
DOI : 10.5515/KJKIEES.2008.19.2.121
In this paper, we present a fast analysis of multilayer microstrip fractal structure by using the fast multipole method (FMM). In the analysis, accurate spatial green`s functions from the real-axis integration method(RAIM) are employed to solve the mixed potential integral equation(MPIE) with FMM algorithm. MoM`s iteration and memory requirement is
in case of calculation using the green function. the problem is the unknown number N can be extremely large for calculation of large scale objects and high accuracy. To improve these problem is fast algorithm FMM. FMM use the addition theorem of green function. So, it reduce the complexity of a matrix-vector multiplication and reduce the cost of calculation to the order of
, The efficiency is proved from comparing calculation results of the moment method and Fast algorithm.
Estimating Three-Dimensional Scattering Centers of a Target Using the 3D MEMP Method in Radar Target Recognition
Shin, Seung-Yong ; Myung, Noh-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 130~137
DOI : 10.5515/KJKIEES.2008.19.2.130
This paper presents high resolution techniques of three-dimensional(3D) scattering center extraction for a radar backscattered signal in radar target recognition. We propose a 3D pairing procedure, a new approach to estimate 3D scattering centers. This pairing procedure is more accurate and robust than the general criterion. 3D MEMP(Matrix Enhancement and Matrix Pencil) with the 3D pairing procedure first creates an autocorrelation matrix from radar backscattered field data samples. A matrix pencil method is then used to extract 3D scattering centers from the principal eigenvectors of the autocorrelation matrix. An autocorrelation matrix is constructed by the MSSP(modified spatial smoothing preprocessing) method. The observation matrix required for estimation of 3D scattering center locations is built using the sparse scanning order conception. In order to demonstrate the performance of the proposed technique, we use backscattered field data generated by ideal point scatterers.
Design and Implementation of Single-Feed Dual-Band Circular Polarization Square Patch Antenna for GPS and DMB
Yoon, Ki-Suk ; Kim, Hyuck-Jin ; Yang, Woon-Geun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 138~144
DOI : 10.5515/KJKIEES.2008.19.2.138
In this paper, we propose a novel single-feed dual-band circular polarization square patch antenna for GPS(global positioning system)/DMB(digital multimedia broadcasting) receiver. The proposed antenna has folded slots at the 4 corners and a diagonal slot at the center of the square patch. The measured -10 dB impedance bandwidths of the proposed antenna were 84 MHz ranging from 1.516 GHz to 1.600 GHz for the low frequency band(GPS) and 109 MHz ranging from 2.596 GHz to 2.705 GHz for the high frequency band(DMB). The measured peak linear antenna gains of the proposed antenna were 6.23 dBi at 1.575 GHz for GPS and 6.97 dBi at 2.642 GHz for DMB band.
A Dual Band Microstrip Antenna with Two Y-Shaped Slots for Satellite Internet Service
Kim, Byoung-Chul ; Lee, Sang-Un ; Han, Sung-Min ; Lee, Ho-Jin ; Choo, Ho-Sung ; Park, Ik-Mo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 145~151
DOI : 10.5515/KJKIEES.2008.19.2.145
In this paper, a dual band microstrip antenna with similar radiation pattern for the satellite internet service is proposed. The proposed antenna has two Y-shaped slots on the microstrip patch that is fabricated on RO4003 substrate with a dielectric constant of 3.38 and a thickness of 0.508 mm, and operates in the 2 GHz and 5 GHz bands. The size of the antenna is
, and fed by coaxial cable. The measured bandwidths of the antenna are 2.398
2.507 GHz and 5.458
5.972 GHz for VSWR<2. The measured gains are 8.92 dBi and 7.74 dBi, respectively, for the lower and upper bands.
Performance Analysis of the UHF RFID Reader with the Range Correlation Effects of the Phase Noise
Jang, Byung-Jun ; Kang, Min-Soo ; Lim, Jae-Bong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 152~160
DOI : 10.5515/KJKIEES.2008.19.2.152
In this paper, we analyze the performance of a direct-conversion UHF RFID reader with the range correlation effects of the phase noise. Since a UHF RFIB system uses the same oscillator to generate the transmitted carrier and the local oscillation, the periodic interference and phase noise reduction effects occur due to time delay between two signals. Through exact theory and simulation, we verify how to cancel the periodic interference phenomena using I/Q diversity combining technique. And, we analyze phase noise reduction effects due to range correlation as a function of the tag-reader distance and the offset frequency Using these results, we simulate the symbol-error-rate performance with respect to phase noise with and without range correation effects. We show that the phase noise of the local oscillator has little effect on the symbol-error-rate performance because of phase noise reduction by range correlation.
Spectrum Requirement Estimation for IMT Operation
Han, Tae-Young ; Kim, Nam ; Yang, Jae-Soo ; Choi, Jung-Hun ; Kim, Cheol-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 161~167
DOI : 10.5515/KJKIEES.2008.19.2.161
This paper describes the overview of spectrum requirement estimation recommended in ITU-R Rec. M.1390 and [IMT.METH] and its difference for the IMT mobile service, and a (IMT.METH) methodology is applied to the spectrum estimation of the recent IMT service. The traffic model and traffic calculation algorithm is briefly described for the carried traffic which is determined in terms of the offered traffic, system rapacity, and the criteria of quality of service. And the spectrum requirement demand which is required from year 2010 to year 2015 is calculated as an example for the IMT service which is recently operated and deployed in the current Korean market after obtaining the reasonable market data and the ITU market prediction data.
Design and Build of Transmit/Receive Module for X Band
Park, Sung-Kyun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 168~173
DOI : 10.5515/KJKIEES.2008.19.2.168
In this paper, we have designed transmit/receive Module for X band which can be applied to active phase array radar system. AESA(active electrically beam steered array) is able to transmit high power as like TWTA with composition of TH Module and steer a main beam faster than mechanically steering system. The proposed structure of T/R Module for X band is brick type for physical structure, common leg structure electrically and small size design as MCM(multi chip module). The results show that the characteristic of proposed T/R module can fully cover the specification of required military radar application.
Design of High Speed Switching Circuit for Pulsed Power Amplifier
Yi, Hui-Min ; Hong, Sung-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 174~180
DOI : 10.5515/KJKIEES.2008.19.2.174
The pulsed amplifier which switches the main supply voltage of RF amplifier according to input pulse signal has good efficiency and low noise level between pulses. And it has simple structure because it doesn`t need a pulse modulator at input port. The pulsed amplifier using the conventional switching circuit has slow fall time compared to rise time. We proposed the novel switching circuit for improving the fall time of pulsed amplifier The proposed switching circuit is implemented by replacing FET of conventional circuit with BJT. As a result of appling this circuit to RF pulsed amplifier, the rise and fall time are 5.7 ns and 21.9 ns at 27 dBm output power, respectively.
4-Port Direct Conversion Receiver for BPSK Demodulation
Jo, Ik-Kyun ; Lee, Jo-Seph ; Na, Won ; Yu, Jong-Won ; Lee, Moon-Que ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 181~190
DOI : 10.5515/KJKIEES.2008.19.2.181
In this paper, we suggest a new 4-port receiver instead of 6-port schematic for the demodulation of BPSK. The designed receiver is implemented by a ring-hybrid balun, two power detectors, and a comparator For the validity of the proposed receiver, we demonstrate a BPSK modulator/demodulator at 2.45 GHz. The measured data shows that the proposed 4-port receiver can successfully demodulate a data rate of 1 Mbps.
An 2.4 GHz Bio-Radar System for Non-Contact Measurement of Heart and Respiration
Lee, Yong-Jin ; Jang, Byung-Jun ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 191~199
DOI : 10.5515/KJKIEES.2008.19.2.191
In this paper, we present a performance analysis and design and implementation results of a 2.4 GHz bio-radar system that can detect human heartbeat and respiration signals. In order to design a 2.4 GHz bio-radar system qualitatively, we investigate the electromagnetic properties of human tissues and calculate the target SNR of demodulation output with respect to distance. The target SNR is defined by the 90 % success ratio for detecting heartbeat signal. With this target SNR value, the performance and link budget of the bio-radar system is simulated using MATLAB. Using this link budget results, the direct conversion receiver is designed and Implemented in 4 layer printed circuit board(PCB). With output power of 0 dBm and 5 Hz bandwidth, 80 % success ratio of 50 cm is measured. Measurement results show a good agreement with simulation results.
Modeling and Analysis of Propagation Characteristics for Mountain Region at 2.3 GHz
Han, Il-Tak ; Choi, Moon-Young ; Kim, Chang-Gu ; Bae, Moon-Kwan ; Choi, Jong-Chan ; Yoon, Young-Ki ; Pack, Jung-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 200~206
DOI : 10.5515/KJKIEES.2008.19.2.200
To implement a mobile radio system, wave-propagation models are necessary to determine propagation characteristics accurately, Currently, the empirical/theoretical prediction models for urban environments are fairly well-developed. But there is a lack of a suitable prediction model for mountain region. So in this paper, to develop the prediction model for mountain region, propagation environments are classified based on three basic mechanisms: reflection, diffraction, penetration(absorbtion and scattering), and measurements have been performed for the classified mountain regions including open area, forest and ridge. Using the measurement data, empirical modeling of propagation characteristics are performed, and then a prediction model for mountain region is proposed.
Design of a Ku-Band Quasi-Yagi Antenna Array Using an Ultra-Wideband Balun
Woo, Dong-Sik ; Kim, Young-Gon ; Cho, Young-Ki ; Kim, Kang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 207~213
DOI : 10.5515/KJKIEES.2008.19.2.207
A simplified design procedure for quasi-Yagi antenna arrays using an ultra-wideband balun is presented. The proposed antenna design procedure is based on the simple impedance matching among antenna components: i.e., balun, feed, and antenna This new broadband and high gain antenna array is possible due to the ultra-wideband performance of the balun. As design examples, wideband
quasi-Yagi antenna arrays are successfully designed and implemented in Ku-band with frequency bandwidths of about 50 % and antenna gains of 9
10 dBi and 11
12 dBi, respectively. And the simulated and measured results demonstrate wide bandwidths and good radiation properties. These antenna arrays can be applied to various phased-array and spatial power combining systems.
Modeling of Radiation Effects for 1-D RLH-TL Using Extraction of Circuit Parameters
Choi, Chang-Ho ; Lee, Bom-Son ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 214~222
DOI : 10.5515/KJKIEES.2008.19.2.214
The equivalent circuit for the RLH-TL is proposed considering radiation effects due to the inclusion of a series capacitor and shunt inductor in a unit cell for the right/left-handed transmission line(RLH-TL). The design equations to realize a specific phase shift at a given frequency is also provided. The S-parameters for unit cells with N
A Small Composite Right/Left-Handed Transmission Line Metamaterial Antenna Using a Magneto-Dielectric Material
Jang, Kyung-Duk ; Kim, Jae-Hee ; Kim, Gi-Ho ; Seong, Won-Mo ; Park, Wee-Sang ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 223~230
DOI : 10.5515/KJKIEES.2008.19.2.223
A CRLH-TL based compact metamaterial antenna on a magneto-dielectric material is proposed. The proposed antenna is composed of two patches and vias, which is loaded by a magneto-dielectric material constructed by SRRs. The characteristic of SRRs is studied, and the size reduction of the antenna by using the magneto-dielectric material is confirmed. The simulated resonant frequency of the antenna has showed a decrease of 7.13 % at - 1st-order resonant mode, and 23.9 % at zeroth-order resonant mode. A zeroth-order resonant antenna is fabricated and measured, which has a resonant frequency of 1.888 GHz, a bandwidth of 0.48 %, a gain of 0.534 dBi, and an efficiency of 51.7 %.
A Numerical Analysis on the Efficiency of the Resistive Vee Dipole
Kim, Kang-Wook ; Chun, Jong-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 231~236
DOI : 10.5515/KJKIEES.2008.19.2.231
A method of moments model for the resistive vee dipole has been established. In order to validate the numerical model, an experimental model is built and reflections from the antenna in the feed line are measured. The measured data and the numerical data agree closely validating the numerical model. Based on the numerical model, efficiency of the antenna and the power dissipated in the resistors are analyzed. The results show that the antenna has low radiation efficiency because of the loading resistors and that the resistors near the drive point of the antenna dissipate more power than do the resisters far from the drive point. The results can be used to determine the amount of power that can be accepted by the resistive vee dipole, to determine the power rating of the loading resistors for a desired application, or to estimate the operation range of the antenna.
Characteristics of Insertion Loss of Transmission Line with Different Line Length Crossing a Rectangular Aperture in a Backplane
Jung, Sung-Woo ; Kim, Ki-Chai ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 237~243
DOI : 10.5515/KJKIEES.2008.19.2.237
This paper presents the backplane effects for two-wire transmission line with different line length crossing the rectangular aperture in an infinite ground backplane. The FDTD method is used to determine the characteristics of the backplane insertion loss and return loss of the transmission line in accordance with the transmission line spacing and additional wire lengths. The results show that the insertion gain is obtained for the narrow spacing of the transmission line and the insertion loss is appeared for the transmission line with the additional wire The measurements of return loss are performed to verify the theoretical analysis.
Development of EM Wave Absorber for Suppression Noise from PCB Using Sendust and Mn-Zn Ferrite
Yoon, Sang-Gil ; Kim, Dong-Il ; Song, Young-Man ; Park, Soo-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 244~249
DOI : 10.5515/KJKIEES.2008.19.2.244
In this paper, we designed and fabricated the EM wave absorber consists of Sendust and Mn-Zn ferrite for suppressing EM wave noise from PCB in ISM(Industrial, Scientific and Medical) band of 2.4 GHz. We fabricated several samples in different ratios of Sendust to Mn-Zn ferrite with CPE(Chlorinated Ploy-ethylene) as binder and confirmed that optimum composition ratio of absorbing materials was Sendust. Mn-Zn ferrite : CPE
An X-band Oscillator Using a New Hairpin Resonator
Seo, Sung-Won ; Jeong, Jin-Ho ; Park, Chan-Hyeong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 250~256
DOI : 10.5515/KJKIEES.2008.19.2.250
In this paper, an X-band oscillator is presented using a new miniaturized microstrip hairpin resonator. The newly designed hairpin resonator on the microstrip line employs the spiral structure, which shows a higher loaded quality factor and the 50 % reduced circuit area compared to the conventional one at 9.2 GHz. The oscillator using proposed resonator shows the output power of 10.87 dBm, the second harmonic suppression of 41.99 dBc, and the phase noise performance of -101.49 dBc/Hz at 100 kHz offset, which is better than the conventional resonator oscillator by 6.17 dB.
The Characteristic of Passive Elements on Aluminum Nitride Substrate
Kim, Seung-Yong ; Yook, Jong-Min ; Nam, Choong-Mo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 257~262
DOI : 10.5515/KJKIEES.2008.19.2.257
In this paper, the key parameters of
laser(focus depth, air blow rate, total laser beam time, number of pulse) are experimented for thru-hole and scribing line on AIN(aluminum nitride) substrate with high thermal conductivity. And, microstrip line & spiral planar inductor are fabricated on AIN substrate using 5 um Cu-plating with self-masking technique. The microstrip line of AIN has 0.1 dB/mm attenuation at 10 GHz and 6 nH spiral planar inductor has 56 maximum quality factor at 1 GHz. Thus, the AIN substrate is promising for GHz applications of high power area.
EMI Reduction Analysis by a Conductor between Frames
Koh, Eun-Kwang ; Shim, Min-Kyu ; Hong, Eun-Ju ; Lee, Jai-Yeol ; Park, Seung-Hun ; Kwak, In-Gu ; Nah, Wan-Soo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 263~270
DOI : 10.5515/KJKIEES.2008.19.2.263
In this paper, we investigated EMI(electromagnetic interference) reduction by conductor connection, which was used for fixing and electrical grounding between frames. Conductor connects two frames and then it provides the decrease of return path of signal current. To prove the effect of conductor, we measured/simulated the RE(radiated emission) with/without conductors between the two frames. From the measured/simulated results, we observed that EMI decreased about 1
10 dB at the frequency range of 30 MHz to 1 GHz. VNA(vector network analyzer) was used to measure the S parameters and the RE was measured in a 3 m anechoic chamber. The simulated and measured results are compared and discussed.
A Study on Interference Analysis between FHSS and DSSS Short Range Radio Devices
Kim, Jin-Young ; Kim, Eun-Cheol ; Yang, Jae-Soo ; Ryu, Chung-Sang ; Oh, Seong-Taek ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 2, 2008, Pages 271~279
DOI : 10.5515/KJKIEES.2008.19.2.271
In this paper, we investigate interference between short-range radiocommunication devices(SRDs) with frequency hopping spread spectrum(FHSS) and direct sequence spread spectrum(DSSS) methods when they are in the same frequency bands. In order to analyze interference from unwanted emission of SRD with DSSS to that of FHSS, Monte-carlo(MC) simulation method is employed and interference probabilities are calculated. We simulate interference scenarios in accordance with several duty cycles and bandwidths. It is also assumed that the propagation model is free space. The effect of distance between interfering transmitter and victim receiver is analyzed and bit error rate(BER) is simulated. From the interference analysis results, it is shown that duty cycle affects compatibility more than band-width does. Also, we can make sure of the separation distance which satisfies BER criterion when there are only one interfering transmitter and multiple interfering transmitters.