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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Compact Multi-harmonic Suppression LTCC Bandpass Filter Using Parallel Short-Ended Coupled-Line Structure

  • Wang, Xu-Guang (Department of Radio Science & Engineering, Korea Maritime University) ;
  • Yun, Young (Department of Radio Science & Engineering, Korea Maritime University) ;
  • Kang, In-Ho (Department of Radio Science & Engineering, Korea Maritime University)
  • Received : 2008.07.06
  • Accepted : 2008.04.07
  • Published : 2009.06.30
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Abstract

This paper presents a novel simple filter design method based on a parallel short-ended coupled-line structure with capacitive loading for size reduction and ultra-broad rejection of spurious passbands. In addition, the introduction of a cross-coupling capacitor into the miniaturized coupled-line can create a transmission zero at the second harmonic frequency for better frequency selectivity and attenuation level. The aperture compensation technique is also applied to achieve a strong coupling in the coupled-line section. The influence of using the connecting transmission line to cascade two identical one-stage filters is studied for the first time. Specifically, such a two-stage bandpass filter operating at 2.3 GHz with a fractional bandwidth of 10% was designed and realized with low-temperature co-fired ceramic technology for application in base stations that need high power handling capability. It achieved attenuation in excess of -40 dB up to $4f_0$ and low insertion loss of -1.2 dB with the size of 10 mm ${\times}$ 7 mm ${\times}$ 2.2 mm. The measured and simulated results showed good agreement.

Keywords

References

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