• Title/Summary/Keyword: 고조파 억압

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A Study on a Shorting Pin and Slot-Loaded Antenna for Harmonic Suppression (고조파 억압을 위한 단락핀-슬롯 적재 안테나에 관한 연구)

  • 권세웅;이성호;이병무;김형락;윤영중
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.8
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    • pp.811-818
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    • 2002
  • In this paper, a shorting pin and slot-loaded microstrip patch antenna is designed and fabricated. A shorting pin and slots are used for harmonic suppression on an inset fed antenna. A shorting pin and slot properties are analyzed by cavity model of the rectangular patch and the characteristics of the designed antenna are described. The designed antenna provides a gain of 7 dBi at the fundamental frequency, 5.8 GHz. In the second and third harmonic frequencies, the proposed antenna has gain suppression properties of -3.3 dB and -14.3 dB at each harmonic frequency, respectively.

Parallel Feedback Oscillator for Strong Harmonics Suppression and Frequency Doubler (고조파 억압을 위한 병렬 궤환형 발진기와 주파수 체배기)

  • Lee, Kun-Joon;Ko, Jung-Pil;Kim, Young-Sik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.2A
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    • pp.122-128
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    • 2005
  • In this paper, a low noise parallel feedback oscillator for harmonic suppression and a frequency doubler are designed and implemented. As the fundamental signal of the oscillator for frequency doubling is extracted between the dielectric resonator (DR) filter and the gate device of the active device, the undesired harmonics at the output of the oscillator is remarkably suppressed. The fundamental signal of the oscillator for frequency doubling directly feeds to the frequency doubler without an additional band pass filter for harmonic suppression. The second harmonic suppression of -47.7 dBc at the oscillator output is achieved, while the fundamental suppression of -37.5 dBc at the doubler output is obtained. The phase noise characteristics are -80.3 dBc/Hz and -93.5 dBc/Hz at the offset frequency of 10 KHz and 100 KHz from the carrier, respectively.

SIR CPW Bandpass Filter with Folded Feed Structure for Suppressing Spurious Harmonics (고조파 억압을 위한 접힌 피드 구조를 갖는 SIR CPW 대역통과 여파기)

  • 박광선;이창언;천동완;이진택;신철재
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.2
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    • pp.159-164
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    • 2004
  • In this paper, we have proposed the folded feed structure for the spurious harmonic suppression and we have designed the SIR CPW bandpass filter using this feed structure. The characteristic of the proposed feed structure was similar to that of the lowpass filter has wide stopband region and this can be used usefully to the spurious harmonic suppression of the bandpass filter. From the simulation and the measurement result, SIR CPW bandpass filter with folded feed structure has good harmonic suppression characteristics up to 5.8 f$\sub$0/ with -20 dB suppression level.

Bandwidth Enhancement of a Meander Slot Antenna with Harmonic Suppression (고조파 억압 특성을 갖는 미앤더 슬롯 안테나의 대역폭 향상에 관한 연구)

  • Hwang, Kwang-Sun;Kim, Hyung-Rak;Chang, Ki-Hoon;Ha, Jung-Uk;Yoon, Young-Joong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.9
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    • pp.961-966
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    • 2003
  • Bowtie shaped meander slot antenna with harmonic suppression is designed and demonstrated experimentally. A substrate with height of 0.508 mm and relative permittivity of 2.5 is used, and the fundamental resonant frequency is 5.536 GHz. With thin conductor line in the antenna, harmonic suppression characteristic is obtained, and return losses at the 2nd and 3rd harmonic frequencies are -0.56 dB and -1.9 dB, respectively. Also, bowtie shape is applied to the antenna design for bandwidth enhancement, and the resulting bandwidth is 3.7 %, which is about three times wider than the reported meander slot antenna with harmonic suppression$\^$[1],[2]/.

A study on efficiency improvement of power amplifier from enhanced harmonic suppression using DGS coupled line (DGS 결합선로를 이용하여 고조파 억압특성을 향상시킨 전력증폭기의 효율증대에 관한 연구)

  • Song, Dae-Geon;Kim, Jang-Won
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.2 no.4
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    • pp.13-18
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    • 2009
  • This paper suggests that efficiency improvement of power amplifier to enhance harmonic suppression using a DGS line structure. A efficiency related harmonic component is an important factor to design of power amplifier. Therefor harmonic component suppress consisting coupled line using DGS after power amplifier. A DGS line with periodic slits and stubs is first designed and joined after power ampifier. Experimental measurements for efficiency of power amplifier in the WCDMA are shown to improve 6% of PAE.

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A Novel Frequency Doubler using Feedforward Structure and DGS Microstrip for Fundamental and High-Order Components Suppression (Feedforward 구조와 DGS를 이용하여 기본 신호와 3차 이상의 고조파 신호를 제거한 2차 주파수 체배기 설계)

  • 황도경;임종식;정용채
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.5
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    • pp.513-520
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    • 2003
  • In this paper, a novel design concept of frequency doubler using feedforward technique and DGS microstrip line is proposed. The feedforward loop plays a role of fundamental frequency suppression and DGS microstrip line suppresses over the 3rd order harmonic components. By using this new concept, the high suppression for the undesired signals could be achieved easily. The proposed technique is experimentally demonstrated in 1.87 GHz-to-3.74 GHz frequency doubler. The output power of -3 dBm at the frequency of 3.74 GHz(2f$\_$0/) is measured with 42.9 dB suppression of the fundamental frequency signal(f$\_$0/), 20.2 dB suppression of the 3rd harmonic signal(3f$\_$0/) and B9.7 dB suppression of the 4th harmonic signal(4f$\_$0/). The conversion loss of -2.34 dB ∼ -5.8 dB at the bandwidth of 100 MHz, the phase noise of -97.51 dB/Hz(@10 kHz) were measured.

A Low-pass Filter with Wide-stop Band Using Radial-shaped Open Stub (광대역의 저지대역을 갖는 부채꼴 형태의 개방형 스터브를 이용한 저역통과 여파기)

  • Yoon, Ki-cheol;Kim, Seong-cheol
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.7
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    • pp.1237-1242
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    • 2016
  • In this paper, the low pass filter with harmonics suppression and rejection using parallel coupled-line and radial type open stub is presented. And the resultant characteristic of the proposed low pass filter is that the harmonics are suppressed and rejected in wide bandwidth due to the parallel coupled-line structure. The open stub of a low pass filter is constructed in radial type which can be used to adjust the size of filter. The size of the proposed low pass filter is $6.98{\times}7.60mm2$ and the cut off frequency is 2.45 GHz. And the filter is economical in unit cost and can be constructed easily and has the merit of mass product because the filter is composed of distributed element. Also, the widely rejected harmonics is 128 % in the bandwidth and the insertion and return losses of the low pass filter are 1.07 dB and 19.5 dB, respectively.

Design and Fabrication of the Frequency Tripper for Medium Power (중전력 주파수 3체배기 설계 및 제작)

  • Roh, Hee-Jung;Lee, Byung-Sun
    • 전자공학회논문지 IE
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    • v.47 no.3
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    • pp.47-52
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    • 2010
  • In this paper, a frequency tripler has been designed with 100mW medium-power using P-HEMT. It is designed to obtain 7.2GHz frequency at the output that is an integer multiple of 2.4GHz input frequency by using nonlinear device that produces 3rd harmonic. The frequency tripler is designed by using load-pull simulation. To suppress the 2nd and fundamental, notch filter is used for the frequency tripler. The tripler is designed to obtain about 21dBm output power with 15dBm input, i.e., 6dB conversion gain and the suppression of 20dBc at fundamental, and 30dBc at the second harmonics.

A Low-loss Phase Shifter with Harmonics Suppression Using Compact Hybrid Coupler (소형 하이브리드 커플러를 이용한 고조파가 억압된 저손실 위상 변위기)

  • Yoon, Ki-Cheol;Ji, Seung-Han;Lee, Jong-Chul
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.14 no.6
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    • pp.110-116
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    • 2015
  • In this paper, a compact low-loss reflector-type phase shifter with harmonic suppression using meander T-shaped branch-line coupler is suggested. The compact coupler for the phase shifter has a size of $22.2{\times}14.9mm^2$ while a conventional branch coupler has a size of $32.6{\times}27.8mm^2$. The phase shifter shows insertion losses of 0.19-0.28 dB at the center frequency of 2.1 GHz, and a measured maximum phase shift of $137^{\circ}$.

Compact Narrow Open-stub Band-pass Filter using FLCLM and Parallel Coupled line (FLCLM과 평행 결합 선로를 이용한 협대역 소형 개방형 스터브 대역통과 필터)

  • Hong, Tae-Ui
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.48 no.3
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    • pp.68-73
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    • 2011
  • In this paper, a compact-narrow open stub band-pass filter with parasitic-signal of low frequency range and second harmonics rejected using the parallel coupled line and FLCLM(Frquency Locked Controlled Length Method) is proposed. The characteristic of the parallel coupled line can be rejection for parasitic-signal of low frequency range and second harmonics. In last filter of experimental results show that insertion loss is 1.2 dB and return loss is 14.8 dB, and the fractional bandwidth is 10 % at the center frequency of 5.8 GHz. In additional, the rejection for parasitic-signal of low frequency range and second harmonics are 28.9 dB and 28.8 dB, respectively.