• Title/Summary/Keyword: 이중대역

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A Design of Dual-band Microstrip Antenna Loading Inverted-L-shaped Parasitic Elements Vertically at Radiation Apertures for GPS Applications (방사개구면에 역 L형 기생소자를 세운 GPS용 이중대역 마이크로스트립 안테나 설계)

  • Choi, Yoon-Seon;Woo, Jong-Myung
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.14 no.5
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    • pp.38-43
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    • 2015
  • In this paper, we present novel dual-band microstrip antennas using inverted-L-shaped parasitic elements vertically at radiation apertures for GPS L1(1.575 GHz) and L2(1.227 GHz) bands. For making dual band which has large interval, the inverted-L-shaped parasitic element was loaded at the radiation aperture of a half-wavelength patch antenna(GPS L1) in opposite direction of the feeding point for receiving the low frequency(GPS L2). The low frequency occurs by perturbation and coupling between the patch and parasitic. Next, due to use circular polarizations at the GPS applications, two inverted-L-shaped parasitic elements were loaded at radiation apertures of each polarizations and the feeding point was moved at diagonal part of the patch. The dimensions of the designed circularly polarized antenna were $88.5{\times}79{\times}10.4mm^3$ ($0.36{\lambda}L{\times}0.32{\lambda}L{\times}0.04{\lambda}L$, ${\lambda}L$ is the free-space wavelength at 1.227 GHz). Measured -10 dB bandwidths were 116.3 MHz(7.4%) and 64.3 MHz(5.2%) at GPS L1 and L2 bands, respectively. All of these cover the respective required system bandwidths. The measured 3 dB axial ratio bandwidths were 11.7 MHz(0.74%) and 14 MHz(1.14%), respectively. Within each of the designed bands, broadside radiation patterns were observed.

Dual-Band Filter Using Heterogeneous Resonators (이종 공진기를 이용한 이중 대역 통과 필터)

  • Kim, Kyoung-Keun;Lim, Yeong-Seog
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.3
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    • pp.253-261
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    • 2010
  • In this paper, the design and the fabrication of dual bandpass filter using heterogeneous resonators is presented. Each resonator would not have an effect on each resonant frequency. Two types of resonators are designed to have different fundamental resonant frequencies, one for the lower passband and the other for the upper passband. In the lower band, half and quarter wavelength resonators were used. In the upper band, a dual-mode resonator was used for adjusting bandwidth. In the upper pass band frequency, resonators of lower passband acts as the input and output. For WLAN, Proposed filters with different second passband frequencies at 2.45/5.2 GHz and 2.45/5.8 GHz are designed and fabricated.

Transformation of 4-port Self-feedback Dual-band Bandpass Filter into 2-port (4단자 자기 귀환 방식 이중대역 대역통과 여파기의 2단자로의 변환)

  • Lim, Ji-Eun;Nam, Min-Hee;Choi, Han-Ol;Lee, Jae-Huyn
    • Journal of Satellite, Information and Communications
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    • v.5 no.2
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    • pp.25-28
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    • 2010
  • The need for multiband RF front-end in modern communication system is growing rapidly. For example, satellite system always uses a complex arrangement of frequency plans and consequently needs filters for each communication channel and it will be ideal to have a single filter module that does jobs of all those channel filters to reduce the size and payload of the system. In this paper, a new method to transform four-port self-feedback balanced dual-band bandpass filter into two-port is proposed. The two-port balanced dual-band bandpass filter which has baluns at the input and output ports and the fundamental frequency at 2.5 GHz and the first harmonic frequency at 5.7 GHz is fabricated and measured. Good agreement between measured and simulated results was achieved.

Design of a Dual Band-pass Filter Using Fork-type Open Stubs and SIR Structure (포크 형태의 개방형 스터브 및 SIR 구조를 이용한 이중대역 대역통과 여파기의 설계)

  • Tae-Hyeon Lee
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.22 no.1
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    • pp.252-264
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    • 2023
  • This paper proposes a design of a dual-band band-pass filter that integrates a λg/2 open SIR structure, a transmission line, and a fork-type structure with symmetric and asymmetric open stubs. To obtain the dual-band effect, the proposed filter uses the SIR structure and adjusts the impedance ratio of the SIR structure. Therefore, the position of the harmonics of the filter is shifted through the adjustment of the impedance ratio, and this can obtain a double-band effect. In order to obtain the dual-band characteristics, the dual-band effect is obtained by inserting a open stub between the SIR structures with the SIR structure divided in half. In addition, the second frequency response is obtained by adjusting the length of the open symmetrical stub in the fork-shaped structure. The asymmetrical open stub in the fork form achieves optimum bandwidth by adjusting the length. Therefore, the first center frequency of the proposed band-pass filter is 5.896 GHz and the bandwidth is 13.6 %. At this time, the measurement results are 0.13 dB and 33.6 dB. The second center frequency is 5.906 GHz and the bandwidth is 13.6 %. At this time, the measurement results are 0.15 dB and 19.8 dB. The reason is that when the impedance ratio (Δ) is higher than 1, the position of the harmonic is shifted to a lower frequency band. However, if the impedance ratio (Δ) is lowered by one step, the position of harmonics will move to a higher frequency band. The function of the filter designed using these characteristics can be obtained from the measurement result. The proposed band-pass filter has no coupling loss and no via energy concentration loss because there is no coupling structure of input/output and no via hole. Therefore, system integration is possible due to its excellent performance, and it is expected that dedicated short-range communication (DSRC) system applications used in traffic communication systems will be possible.

Dual-band Planar Monopole Antenna for Autonomous Vehicle (자율주행자동차를 위한 이중대역 평판 모노폴 안테나)

  • Yoon, Yonghyun
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.12 no.4
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    • pp.343-348
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    • 2019
  • In this paper, a dual-band antenna is proposed for the autonomous vehicle as well as omni-directional. The proposed antenna operates in the 4G/LTE band (1,710~2,170MHz) and 5G/NR band (3,400~3,700MHz). In order to obtain the dual-band operation, the planar monopole antenna is proposed as the novel structure with single port of the 50ohm. To give the properties of dual-band, an additional antenna element with slit was added to the planar monopole antenna, and then a structural adjustment parameter was optimized for achieving the target performance in bands. The planar monopole antenna in the LTE band acts as the coupled feed for the added parasitic radiator in the 5G NR band. The proposed antenna has $38.5{\times}36.0{\times}1.0[mm^3]$ on a ground with diameter of 96mm. From the fabrication and measurement results, the impedance bandwidth (VSWR<2) of the proposed antenna covers 1,480~2,260MHz (LTE band: 1,710~2,170MHz) and 3,310~3,930MHz (5G NR band: 3,400~3,700MHz). The proposed planar monopole antenna also obtained the measured gain and radiation pattern of omni-directional radiation pattern in the anechoic chamber.

A Novel Monopole Antenna for ISM 2.45GHz/5.8GHz Dual Band Characteristics by a Linear Monopole Antenna Combined with a Crossed Planar Monopole Antenna (선형 모노폴 안테나와 십자형 모노폴 안테나의 결합에 의한 ISM 2.45GHz/5.8GHz 이중대역 특성을 가지는 안테나 설계)

  • Shim, Jae-Ruen
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.8 no.6
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    • pp.515-519
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    • 2015
  • In this paper, we suggested the novel monopole antenna for dual band characteristics by a linear monopole antenna combined with crossed planar monopole antenna. The target frequency is ISM(Industrial Scientific Medical) 2.45GHz/5.8GHz. The distinctive features of the proposed antenna in this paper is based on the slit in the surface of a crossed planar monopole for the dual band characteristics and the omnidirectional radiation patterns. The compact size of the proposed antenna is $36mm{\times}5.4mm{\times}5.4mm$. According to the simulation results, the bandwidth, the reflection coefficients below -10dB, of 2.45GHz and 5.8GHz are 150MHz and 1.43GHz, respectively. Consequently the proposed antenna structures is apply to the antenna for dual band characteristics.

Dual-Band Balanced Mixer using Nonlinear Phase Characteristic of CRLH Transmission Line (CRLH 전송선로의 비선형 위상 특성을 이용한 이중대역 평형 믹서)

  • Jung, Youn-Woo;Kim, Young;Yoon, Young-Chul
    • Journal of Advanced Navigation Technology
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    • v.15 no.1
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    • pp.97-103
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    • 2011
  • This paper presents a dual-band balanced mixer using nonlinear phase characteristic of composite right/left-handed (CRLH) transmission line. This metamaterial structure provides low LO leakage and high RF to LO isolation without additional filters for LO and RF path. The balanced mixer consists of balun and Wilkinson divider with dual-band characteristic of unit-cell which behaves like a CRLH metamaterial. Experimental results are used to verify the proposed metamaterial functions. The balanced mixer design results in an operating frequency of 870 MHz and 1660 MHz with an optimum mixer conversion loss of 15.2 dB at 870 MHz and 21.2 dB at 1660 MHz.

Dual-Band Class F Power Amplifier using CRLH-TLs for Multi-Band Antenna System (다중밴드 안테나 시스템을 위한 CRLH 전송선로를 이용한 이중대역 Class F 전력증폭기)

  • Kim, Sun-Young;Seo, Chul-Hun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.12
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    • pp.7-12
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    • 2008
  • In this paper, a highly efficiency power amplifier is presented for multi-band antenna system. The class F power amplifier operating in dual-band designed with one LDMOSFET. An operating frequency of power amplifier is 900 MHz and 2.14 GHz respectively Matching networks and harmonic control circuits of amplifier are designed by using the unit cell of composite right/left-handed(CRLH) transmission line(TL) realized with lumped elements. The CRLH TL can lead to metamaterial transmission line with the dual-band holing capability. The dual-band operation of the CRLH TL is achieved by the frequency offset and the nonlinear phase slope of the CRLH TL for the matching network of the power amplifier. Because the control of all harmonic components for high efficiency is very difficult, we have controled only the second- and third-harmonics to obtain the high efficiency with the CRLH TL. Also, the proposed power amplifier has been realized by using the harmonic control circuit for not only the output matching network, but also the input matching network for better efficiency.

Dual-Band Unequal Power Divider based on CRLH Transmission Line (CRLH 전송선로를 기반으로 한 이중대역 비대칭 전력 분배기)

  • Yoo, Jae-Hyun;Kim, Young;Yoon, Young-Chul
    • Journal of Advanced Navigation Technology
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    • v.14 no.6
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    • pp.909-915
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    • 2010
  • In this paper, the unequal power divider based on CRLH (Composite Right/Left-Handed) transmission line with dual-band characteristic is proposed. They consist of dual-band branch line hybrid coupler, the connection between input and isolation port of hybrid coupler and ${\lambda}/4$ impedance transformer. When the transmission line between input and isolation port of hybrid coupler is asymmetrical connected, the divider is obtained the output results of the equal phase and unequal power dividing ratio. The simulation results of the divider represent the power ratio of 0 dB ~ 20 dB. To validate a function of divider, the hybrid coupler and transformer with 880 MHz and 1850 MHz is implemented. As a result, the proposed unequal divider obtains the power ratio of 3.2 dB ~ 8.8 dB at 880 MHz and 2.5 dB ~ 14.0 dB at 1850 MHz.

A study of Concurrent Dual Band Mixer Design Using Dual-Gate FET Structure (Dual-Gate FET구조를 이용한 Concurrent 이중 대역 주파수 혼합기 설계 연구)

  • Jung, Hyo-Bin;Choi, Jin-Kyu;Kim, Hyeong-Seok
    • Proceedings of the KIEE Conference
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    • 2008.05a
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    • pp.153-156
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    • 2008
  • 본 논문은 Local oscillator의 2차 harmonic 신호를 이용하고 Dual gate FET 형태를 이용한 이중대역 주파수 혼합기 설계에 대한 연구 이다. 기존의 회로 구조는 두 대역을 처리하기 위해 각각 두 개의 국부 발진기와 혼합기를 사용함으로 인하여 구조의 복잡함과 큰 전력 손실이라는 단점을 가지고 있었다. 본 연구는 하나의 주파수 혼합기로 두 개의 대역에서 동시에 적용할 수 있는 Concurrent 이중 대역 설계 연구를 하였다. ISM(Industrial Science Medical) 대역 인 912MHz, 2.45GHz의 RF 입력과 455.5MHz, 1224.5MHz의 LO 입력 신호에서 동일한 IF인 1MHz로 하향변환 했을 때 모의실험 결과 변환이득은 각각 7dB, 12dB로 이고 RF-LO 격리도는 -29dB, -24.7dB가 나왔다. 또한 두 입력 단에서의 반사손실의 -15dB 이상을 얻었다. 또한 각각의 대역에서 잡음지수는 8.5dB, 6.26dB이다.

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