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Design of Dual-Band Bandpass Filters for Cognitive Radio Application of TVWS Band
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ABSTRACT

This paper presents a novel design for dual-band bandpass filters. The proposed filters are applicable to the carrier aggregation of the TV white space (TVWS) band and long-term evolution (LTE) band for cognitive radio applications. The lower passband is the TVWS band (470–698 MHz) whose fractional bandwidth is 40 %, while the higher passband is the LTE band (824–894 MHz) with 8 % fractional bandwidth. Since the two passbands are located very close to each other, a transmission zero is inserted to enhance the rejection level between the two passbands. The TVWS band filter is designed using magnetic coupling to obtain a wide bandwidth, and the LTE band filter is designed using dielectric resonators to achieve good insertion loss characteristics. In addition, in the proposed design, a transmission zero is placed with cross-coupling. The proposed dual-band bandpass filter is designed as a two-port filter (one input/one output) as well as a three-port filter (one common input/two outputs). The measured performances show good agreement with the simulated performances.


KEYWORD
Cognitive Radio , Cross Coupling , Dual-Band BPF , TV White Space
참고문헌
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OAK XML 통계
이미지 / 테이블
  • [ Fig. 1. ]  Conventional bandpass filter configuration for the TV white space (TVWS) band.
    Conventional bandpass filter configuration for the TV white space (TVWS) band.
  • [ Fig. 2. ]  Bandpass filter with cross couplings between nonadjacent resonators: (a) designed circuit and (b) simulated results.
    Bandpass filter with cross couplings between nonadjacent resonators: (a) designed circuit and (b) simulated results.
  • [ Fig. 3. ]  Designed bandpass filter for the TV white space (TVWS) band with cross couplings.
    Designed bandpass filter for the TV white space (TVWS) band with cross couplings.
  • [ Fig. 4. ]  Frequency responses of two bandpass filters for the TV white space (TVWS) band (solid=with cross couplings, dotted=without cross couplings).
    Frequency responses of two bandpass filters for the TV white space (TVWS) band (solid=with cross couplings, dotted=without cross couplings).
  • [ Fig. 5. ]  Designed LTE-band bandpass filter: (a) conventional circuit and (b) circuit with transmission zeros.
    Designed LTE-band bandpass filter: (a) conventional circuit and (b) circuit with transmission zeros.
  • [ Fig. 6. ]  Simulated frequency performances of Fig. 5(a) and (b).
    Simulated frequency performances of Fig. 5(a) and (b).
  • [ Fig. 7. ]  Designed dual-band bandpass filter (two ports).
    Designed dual-band bandpass filter (two ports).
  • [ Fig. 8. ]  Designed dual-band bandpass filter with a common input port and two output ports (three ports).
    Designed dual-band bandpass filter with a common input port and two output ports (three ports).
  • [ Table 1. ]  Parameter for two-port dual-band bandpass filter
    Parameter for two-port dual-band bandpass filter
  • [ Table 2. ]  Parameter for three-port dual-band bandpass filter
    Parameter for three-port dual-band bandpass filter
  • [ Fig. 9. ]  Simulated and measured S-parameters of proposed two-port dual-band handpass filter.
    Simulated and measured S-parameters of proposed two-port dual-band handpass filter.
  • [ Fig. 10. ]  Simulated and measured S-parameters of proposed three-port bandpass filter.
    Simulated and measured S-parameters of proposed three-port bandpass filter.
  • [ Fig. 11. ]  Photograph of the proposed designs: (a) two-port(3.1 cm × 4.2 cm) and (b) three-port (diplexer; 3.1 cm × 4.2 cm)
    Photograph of the proposed designs: (a) two-port(3.1 cm × 4.2 cm) and (b) three-port (diplexer; 3.1 cm × 4.2 cm)
  • [ Table 3. ]  Performance summaries of the dual-band bandpass filter
    Performance summaries of the dual-band bandpass filter
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