• Title/Summary/Keyword: Multi-Band Rejection

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Multi-Band Rejection Slot-Shaped DGS and Its Equivalent Circuit Model (다중 대역 슬롯형 DGS와 등가 회로 모델)

  • Woo, Duk-Jae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.5
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    • pp.537-543
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    • 2010
  • This paper presents a slot-shaped defected ground structure(DGS) which has multi-band rejection property. The proposed structure, in which the spiral slot-shaped defects with different size are aligned in the transverse direction to the guiding direction of the coplanar waveguide(CPW), provides multiple resonance frequencies. Compared with the simulated results, the band rejection characteristic is in good agreement with the measurement. Also, an equivalent circuit model of the proposed structure is presented, where the DGS on the ground plane is modeled as LC-resonators. This resonators are inductively coupled to the signal line through mutual inductance. From the equivalent circuit model, multi-band rejection property was derived.

Design and Fabrication of K-band multi-channel receiver for short-range RADAR (근거리 레이더용 K대역 다채널 전단 수신기 설계 및 제작)

  • Kim, Sang-Il;Lee, Seung-Jun;Lee, Jung-Soo;Lee, Bok-Hyung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.7A
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    • pp.545-551
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    • 2012
  • In this paper, K-band multi-channel receiver was designed and fabricated for low noise amplification and down conversion to L-band. The fabricated multi-channel receiver incorporates GaAs-HEMT LNA(Low noise amplifier) which provides less than a 2 dB noise figure, IR(Image Rejection) Filter for rejection of image frequency, IR(Image rejection) mixer to reject a image frequency and improve an IMD(Intermodulation Distortion) characteristic. Test results of the fabricated multi-channel receiver show less than a 3.8 dB noise figure, conversion gain of more than 27dB, and IP1dB(Input 1dB Gain Compression Point) of -9.5 dB and over.

Design Optimization of an Enhanced Stop-band UWB Bow-Tie Antenna

  • Choi, Kyung;Kim, Hyeong-Seok;Hwang, Hee-Yong
    • Journal of IKEEE
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    • v.22 no.3
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    • pp.793-799
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    • 2018
  • An improved design of Ultra Wide Band(UWB) Bow-Tie antenna, which can control an enhanced wide stop-band, is presented. The mutually coupled slot-pair improves and controls the rejection band. The UWB antenna is composed of an electromagnetically coupled Bow-Tie patch and a parasitic ground patch, whose working frequency is extended to full UWB range in this work. By adding slot-pairs on the main patch and optimizing, they can give any requested wide rejection bands and sharp skirt characteristics, as is often required for UWB antennas and multi-band antennas. All the parameters are precisely calculated by an adequate optimization method. The Particle Swarm Optimization(PSO) technique is appropriately adopted. The proposed design and method is proved to give and control the sharp-skirt wide stop-band to UWB Bow-Tie antennas.

Design of LTCC(Low Temperature Co-fired Ceramic) Bandpass Filter to Improve Characteristic of Rejection Band (저지대역 특성을 개선한 LTCC 대역 통과 여파기 설계)

  • Kim, Young-Ju;Park, Jun-Seok;Lim, Jae-Bong;Cho, Hong-Goo
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.256-259
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    • 2003
  • In this paper, a design of multi-layered BPF(bandpass filter) using LTCC(Low Temperature Co-fired Ceramic) process by a lumped-elements is proposed for SOP(system-on-a-chip) of wireless communication systems. The proposed BPF improved a characteristic of rejection band to build an attenuation pole caused by structurally adjacent co-inductance and coupling. The simulation data shows a bandwidth of 90MHz from a center frequency of 2.4GHz, a return loss of 27dB, an insertion loss of 3.2dB, and an attenuation of at least 20dBc at $f_0{\pm}250MHz$. Simulations have used serenade circuit simulation and HFSS EM simulation.

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Design and Implementation of Broadband Antenna and Diplexer for Dual- Band Handsets

  • Joung, Myoung-Sub;Park, Jun-Seok;Kim, Hyeong-Seok;Lim, Jae-Bong;Cho, Hong-Goo
    • KIEE International Transactions on Electrophysics and Applications
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    • v.4C no.6
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    • pp.288-294
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    • 2004
  • In this paper, a ceramic antenna and diplexer are designed for dual-band handset ap plications. Basically, the antenna is designed by using the meander line configuration. The diplexer presented in this paper is composed of both low- and high-pass filters. We have designed the low- and high-pass filters with attenuation poles to improve the attenuation performances of the diplexer. The attenuation poles are located at each rejection frequency region so as to improve the shrinkage characteristic of the diplexer. In order to accomplish the volume effectiveness, the antenna and the diplexer have been designed and fabricated in a multi-layer structure. The diplexer designed with a multi-layer structure has inductors and capacitors, which are implemented by LTCC (Low Temperature Co-fired Ceramics) process technique. Design of the multi-layer antenna and diplexer has been achieved by employing the full 3-D EM simulation. The designed antenna and diplexer offer excellent return loss and broadband performances with highly isolated rejection performance.

Design of Dual-Band Power Amplifier for the RFID Frequency-Band (RFID 대역에서 동작하는 이중 대역 전력증폭기 설계)

  • Kim, Jae-Hyun;Hwang, Sun-Gook;Park, Hyo-Dal
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.3
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    • pp.376-379
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    • 2014
  • In this paper, we designed more improving a dual-band power amplifier than the transceiver of RFID reader that operates at 910 MHz and 2.45 GHz. A dual-band power amplifier has two circuits. One matching circuit is composed lumped element in the band of 910 MHz. The other matching circuit using distributed element in the high band of 2.45 GHz. So, this dual-band power amplifier works as Band Rejection Filter in the band of 910 MHz but in the high band of 2.45 GHz works as Band Pass Filter. Therefore, this is composed a microstrip transmission line. A power amplifier is showed gains of 8 dB output power at 910 MHz and 1.5 dB output power at 2.45 GHz. If input power is 10 dBm, both of bands output 20 dBm.

Narrow Band Interference Canceller Algorithm robust to Impulsive Interference in MC-CDMA System (MC-CDMA 환경에서 임펄스 간섭에 강한 협대역 간섭제거 알고리즘)

  • 이영용;최성규;최형진
    • Proceedings of the IEEK Conference
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    • 1999.11a
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    • pp.5-8
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    • 1999
  • In this paper, we present narrowband interference (NBI) cancelling algorithm applied to wideband spread spectrum system. We introduce multi-carrier transmission technique to overcome hardware inplementation difficulty of wideband spreading above 40MHz and to enhance NBI performance. A direct-sequence spread spectrum receiver using both decision-feedback and two sided LMS filters for combating narrowband interference is applied. We show that performance of this receiver outperforms conventional NBI rejection systems in tone jamming, partial band jamming, and impulsive channel through the bit error ratio evaluation. In addition, we propose a new technique to improve the performance of time domain NBI rejection algorithm sensitive to impulsive channel.

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Multi-Pole Low Pass Filter Embedded K-Band LTCC Upconverter (다중 폴 저역 통과 여파기가 내장된 K-대역 LTCC 주파수 상향 변환기)

  • Jeong, Jin-Cheol;Yom, In-Bok;Yeom, Kyung-Whan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.6
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    • pp.621-629
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    • 2008
  • This paper presents a low temperature co-fire ceramics(LTCC) Upconverter for a Ka-band OBS satellite transponder in order for size reduction which is one of the most important requirement for satellite components. A S-band low-pass filter(LPF), a K-band band-pass filter(BPF), and an upconverting MMIC mixer are embedded in the multi-layer structure of the upconverter. All spurious can be selectively rejected by employing a modified Elliptic low pass filter with a multi-pole structure for the S-band LPF. Also an improved performance of out-of-band rejection can be obtained. At the K-band BPF design a layer coupled configuration is employed. The upconverting mixer is an MMIC diode mixer with a double-balanced configuration. Conversion loss and isolation of the upconverter are 9 dB and 51 dBc, respectively. The size of the LTCC upconverter is only $8{\times}7{\times}0.6mm^3$ which is one-third for the thin-film based upconverter.

Design of CPW-Fed Small Multi-Band Antenna by Using Band Rejection Semicircle Slot

  • Li, Xiao;Lee, Seung-Woo;Kim, Nam;Kim, Chul-Ho
    • Journal of electromagnetic engineering and science
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    • v.11 no.3
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    • pp.207-212
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    • 2011
  • This paper presents a CPW-fed antenna with three slots. The proposed antenna can operate at 1.9~2.1 GHz and 2.9~3.3 GHz which are generated by the two rectangular slots, and 4.5~11.6 GHz which is generated by the main patch. The semicircle-slot is used as a band-notched filter to stop at a desired band (5.150~5.825 GHz) limited by IEEE 802.11a or HIPERLAN/2 applications. The currents concentrate around corresponding slots at the desired band. The proposed antenna is very small in size, with overall dimensions of $27{\times}32{\times}1\;mm^3$ etched onto an FR4-printed circuit board (PCB).

Rejection of Interference Signal Using Neural Network in Multi-path Channel Systems (다중 경로 채널 시스템에서 신경회로망을 이용한 간섭 신호 제거)

  • 석경휴
    • Proceedings of the Acoustical Society of Korea Conference
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    • 1998.06c
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    • pp.357-360
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    • 1998
  • DS/CDMA system rejected narrow-band interference and additional White Gaussian noise which are occured at multipath, intentional jammer and multiuser to share same bandwidth in mobile communication systems. Because of having not sufficiently obtained processing gain which is related to system performance, they were not effectively suppressed. In this paper, an matched filter channel model using backpropagation neural network based on complex multilayer perceptron is presented for suppressing interference of narrow-band of direct sequence spread spectrum receiver in DS/CDMA mobile communication systems. Recursive least square backpropagation algorithm with backpropagation error is used for fast convergence and better performance in matched filter receiver scheme. According to signal noise ratio and transmission power ratio, computer simulation results show that bit error ratio of matched filter using backpropagation neural network improved than that of RAKE receiver of direct sequence spread spectrum considering of con-channel and narrow-band interference.

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