• Title, Summary, Keyword: PBG

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Study on Millimeter Wave Power Amp Employing PBG (PBG를 이용한 밀리미터웨이브 대역 고출력 증폭기에 대한 연구)

  • 임석순;서철헌;김태원;박규호;송희석
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.1
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    • pp.41-46
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    • 2003
  • In this paper, We designed the millimeter wave power amplifier employing PBG. The amplifier has the bandwidth from 24.6 GHz to 24.75 GHz. For improvement of the Linearity and the PAE of the amplifier, PBG was designed to suppress the 2nd harmonic of the Amplifer. The Proposed PBG have smaller area and better rejection characteristic than conventional PBG structure. The fabricated PBG shows 35 dB or more of rejection characteristic at the 2nd harmonic band of the amplifier. The amplifier has balanced structure having lange coupler which means better input$.$output return loss and higher output power.

Analysis of Stopband Characteristics for 1D Photonic Band-Gap Structures (1D PBG 구조의 저지대역 특성 분석)

  • 신윤미;이지면;이범선
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.2
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    • pp.136-145
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    • 2002
  • In this paper, we facilitate the analysis of 1D PBG structure using a ABCD matrix formulation after converting field parameters into circuit parameters. Dispersion diagrams for an infinite 1D PBG structure are derived and compared with the frequency responses for a finite structure (N=10). When the proposed method is adopted, the analysis and synthesis of 1D PBG structures become very convenient.

Improvement of Ka band Power Amplifier Employing Photonic Band Gap Structure (PBG 구조를 이용한 Ka Band 전력증폭기 성능개선에 관한 연구)

  • Seo Chulhun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.1
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    • pp.65-68
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    • 2004
  • The performances of millimeter wave Power amplifier have been improved by using PBG (photonic bandgap structure) in this paper. The PBG structure has been optimized to obtain the lowpass characteristics in Ka band and employed at output port of Ka band power amplifier. The harmonics of the power amplifier have been suppressed by the PBG of output port and the proposed PBG has suppressed the second harmonic to 40dBc around 50 GHz. The improvements of IMD and PAE of the amplifier employing the PBG structure are obtained $15\%$ and $25\%$, compared with those of the conventional Ka band power amplifier, respectively.

Power Amplifier Design using the Novel PBG Structure for Linearity Improvement and Size Reduction (선형성 개선과 크기 축소를 위한 새로운 PBG 구조를 이용한 전력증폭기 설계)

  • Choi, Jae-Won;Seo, Chul-Hun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.7
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    • pp.29-34
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    • 2007
  • This paper presents a novel photonic bandgap (PBG) structure for size reduction and linearity improvement in power amplifier. The proposed structure is a two-dimensional (2-D) periodic lattice patterned on a dielectric slab that does not require nonplanar fabrication process. Throughout the experi-mental results, this structure has more broad stopband and high suppression performance than conventional three cell PBG and distorted uniplanar compact-PBG (DUC-PBG). This new PBG structure can be applied with power amplifier for linearity improvement. The 3rd intermodulation distortion (IMD3) of the power amplifier using new PBG structure is -36.16 dBc for (code division multiple access) CDMA applications. Compared with power amplifier without the proposed PBG structure, improved IMD3 is -13.49 dBc.

Improvement of Low Pass Filler Using New PBG Structure (새로운 PBG 구조를 이용한 저역통과 여파기 성능 개선에 관한 연구)

  • 이승재;서철헌
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.7A
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    • pp.852-857
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    • 2004
  • In this research, we suggested a new PBG cell with wide stopband. In order to improve the characteristics of the insertion loss, return loss, and ripple, we used two overlapped cells. One is small cell which is made in inside and the other is large cell which is made in outside. The inner cell stops the high band and the outer cell stops the low band. As a result, the new PBG cell had a wide stop band. Insertion loss was about 40dB in stopband and the ripple, and the return loss was improved. Also, the passband is broaden by employing new PBG cells.

Design of a Doherty Power Amplifier Using the Spiral PBG Structure for Linearity Improvement (나선형 구조의 PBG를 적용한 도허티 전력증폭기의 선형성 개선)

  • Kim, Sun-Young;Seo, Chul-Hun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.1
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    • pp.115-119
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    • 2008
  • In this paper, the linearity of Doherty power amplifier has been improved by applying a new Photonic Bandgap(PBG) structure on the output of amplifier. The reposed spiral PBG structure is a two-dimensional(2-D) periodic lattice patterned on a dielectric slab that does not require nonplanar fabrication process. This structure has more broad stopband and high suppression performance than the conventional three cell PBG. Also, It has a sharp skirt property. We obtained the 3rd-order intermodulation distortion(IMD3) of -33dBc for CDMA applications with that of maintaining the constant power added efficiency(PAE), the IMD3 performance is improved as much as -8 dB compared with a Doherty power amplifier without PBG structure. Moreover, the physical length of PBG is shortened, therefore the whole amplifier circuit size is considerably reduced.

Harminic Suppression of Band Pass Filter Using Photonic Band Gap Structure (PBG 구조를 이용한 대역통과 여파기 고조파 억제에 관한 연구)

  • Seo Chulhun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.1
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    • pp.69-72
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    • 2004
  • A bandpass filter has been designed by employing the PBG structure and the aperture on the ground together in this paper. The harmonics of band pass filter have been suppressed by employing the PBG structure and the bandwidth of it has been broadened by using the aperture on the ground. The three kinds of PBG structures has been combined to suppress the harmonics of the filter The center frequency of filter is 2.2 GHz and the bandwidth has been increased from $40\%$ by the aperture and all harmonics were suppressed about 35dBc by the PBG. The insertion loss has been reduced 3.0dB to 2.6dB.

Study on millimeter wave power amp employing PBG (PBG를 이용한 밀리미터웨이브 대역 고출력 증폭기에 대한 연구)

  • 임석순;서철헌;김태원;박규호;송희석
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.165-168
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    • 2002
  • 본 논문에서는 밀리미터 웨이브 대역의 PBG(photonic band gap)를 적용한 고출력 증폭기를 설계하였다. 증폭기의 선형성과 효율을 개선하기 위하여 PBG를 증폭기의 2차 고조파를 제거하도록 설계하였다. 또한 기존의 PBG형태와 비슷한 성능을 가지면서도 출력 라인을 따라서 구현되는 PBG의 길이는 감소하도록 PBG를 변형하여 최적화 시켰다.

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Design of Bandpass Filters using Microstrip Line PBG (마이크로스트립 PBG를 이용한 대역통과 여파기 설계)

  • Lee, Chang-On;Kim, Sang-Tae;Shin, Chull-Chai
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.361-365
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    • 2003
  • In this paper, we proposed the effective serial connection methodology of PBG resonator with defect mode. We use the big difference of impedance ratio in connection region, for example dual PBG, for serial connection. This method reduces the PBG cells and is able to control the pole of bandpass filters. This result in flexibility in design of bandpass filter. Our PBG bandpass filter is modeled by using the ideal transmission line model. This model is very easy, fast, and effective for PBG structure.

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Design of Microstrip Line Bandpass Filter using Photonic Bandgap Structures (Photonic Bandgap 구조를 이용한 마이크로스트립 라인 대역통과 여파기 설계)

  • 김태일;김명기;박익모;임한조
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.4
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    • pp.611-621
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    • 2001
  • This paper presents a design methodology of bandpass filter by using defect modes in photonic bandgap (PBG) structures. PBG structures are realized with alternating section of microstrip line arranged in a periodical manner. A passband is created within the stopband of PBG structures with defect modes, which can be generated by changing the period of certain part of PBG structure. We also extract a simple equivalent circuit of a bandstop filter by using several LC sections.

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