• Title, Summary, Keyword: Spurious Harmonic Suppress

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Design of Half-Wavelength Low-PASS Filter with Wideband Rejection Characteristic (광대역 저지특성을 갖는 반파장 저역통과 여파기 설계)

  • Kim Young-Tae;Kim Young-Ju;Park Jun-Seok;Kim Hyeong-Seok;Lim Jae-Bong;Cho Hong-Goo
    • 한국정보통신설비학회:학술대회논문집
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    • pp.293-295
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    • 2003
  • In this paper, planar harmonic rejection low-pass filter is proposed to effectively suppress spurious response in stop-band. For suppress the unwanted signal such as spurious and harmonics, we presented a new design method controlled the higher order modes. The proposed low-pass filter was shown to suppress the spurious response by more than $20{\sim}40dB$ compared with conventional microstrip low-pass filters. The filter is evaluated by experiment and simulation with good agreement and shown to have attractive properties such as wide stop band range and low insertion loss.

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Design of a Compact Bandstop Filter-combined UHF-band CRLH Bandpass Filter to Suppress the Spurious in L-band (L대역 불요파 저감을 위한, UHF대역 CRLH 대역통과 여파기와 소형 대역저지 여파기의 결합 설계)

  • Eom, Da-Jeong;Kahng, Sung-Tek;Mok, Se-Gyoon;Song, Choong-Ho;Woo, Chun-Sik;Park, Do-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.1
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    • pp.104-109
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    • 2012
  • In this paper, we propose a way to improve the quality of L-band wireless communication from unfriendly influential factors lying in the neighboring RF bands. The UHF-band system has resonator components and they generate harmonics as the spurious in the L-band. Therefore, a metamaterial CRLH bandpass filter is designed for the purpose of system miniaturization and smaller insertion loss, and its spurious phenomenon is observed in the frequency domain. And its harmonics in the L-band are suppressed by a compact bandstop filter whose equivalent circuit is newly developed. The design methodology is validated by the equivalent circuit to be compared with commercial full-wave EM software simulations, where the spurious is dropped by 20dB. Also, the advantage of the proposed design is presented by the comparison where our filter is much smaller than the conventional parallel edge coupled filter by over 50%, with excellent harmonic suppression.

Microstrip Bandpass Filter for Spurious Resonant Mode Rejection using Metameterial Transmission Line (메타매질 전송선로를 이용한 불요 공진모드 제거용 마이크로스트립 대역통과 필터)

  • Yang, Doo-Yeong;Lee, Min-Soo
    • The Journal of the Korea Contents Association
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    • v.9 no.12
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    • pp.566-571
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    • 2009
  • In this paper, microstrip bandpass filter combined DCRLH metameterial-cells with a hairpin resonator is designed and fabricated to be transferred only fundamental passband signal, and removed a spurious resonant mode occurring when filter design using a microstrip transmission line is done. The bandpass filter is composed of CCRLH hairpin resonator and DCRLH interdigit metameterial-cells. The hairpin resonator with CCRLH property is implemented between two DCRLH interdigit metameterial-cells with DCRLH property, which is parallel to input port and output port. The interdigit metameterial-cells suppress spurious harmonics occurring on the higher order frequency and improve a filter performance. Insertion loss of the fabricated microstrip bandpass filter on the passband from 1.91GHz to 2.41GHz is 0.2dB, and attenuation on the stopband from 3GHz to 7.7GHz is bellower than -30dB. Therefore, this filter has a good performance for both mobile communications of WCDMA and wireless internet of WiBro.

Frequency Octupler for W-band Transceiver (W-대역 송수신기를 위한 주파수 8체배기)

  • Lee, Iljin;Kim, Wansik;Kim, Jongpil;Jeon, Sanggeun
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.18 no.6
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    • pp.195-200
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    • 2018
  • A W-band frequency octupler is implemented on 100-nm GaAs pHEMT process. The fabricated octupler can be used as a local oscillator or a signal source of W-band transceivers. Three common-source doublers are connected in cascade to multiply an input signal of 10.75 GHz to 83 GHz. A common-source amplifier is followed for each doubler to improve the conversion gain and suppress the unwanted harmonics. The fabricated octupler showes high output of more than 6 dBm in the 80 - 84 GHz band and achieved excellent spurious suppression performance over 20 dBc.

A Design of High Temperature Superconducting Low-Pass Filter for Broad-Band Harmonic Rejection (광대역 고조파 제거용 고온초전도 저역통과 필터의 설계)

  • Kwak, Min-Hwan;Kim, Sang-Hyun;Ahn, Dal;Han, Seok-Kil;Kang, Kwang-Yong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.78-81
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    • 2000
  • A new type low-pass filter design method based on a coupled line and transmission line theory is proposed to suppress harmonics by attenuation poles in the stop band The design formula are derived using the equivalent circuit of a coupled transmission line. The new low-pass filter structure is shown to have attractive properties such as compact size, wide stop band range and low insertion loss. The seventh-order low-pass filter designed by present method Ins a cutoff frequency of 0.9 GHz with a 0.01 dB ripple level. The coupled line type low-pass filter with stripline configuration was fabricated by using a high-temperature superconducting (HTS ; $YBa_2Cu_3O_{7-x}$) thin film on MgO(100) substrate. Since the HTS coupled line type low-pass filter was proposed with five attenuation poles in stop band such as 1.8, 2.5, 4, 5.5, 62 GHz. The fabricated low-pass filter has improved the attenuation characteristics up to seven times of the cutoff frequency Bemuse of good rejection of the spurious signals and harmonics, our low-pass filter is applicable to mobile base station systems such as cellular, personal communication systems and international mobile telecommunication(IMT)-2000 systems.

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