On-chip single-to-balanced multicoupled line bandpass filters with good selectivity

Yo Shen Lin, Chiou Wen You, Chin Lung Tsai

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

In this work, on-chip single-to-balanced bandpass filters with good selectivity are proposed. The functions of bandpass filter and balun are integrated using a simple multicoupled line structure along with capacitive loadings. The use of inductor is avoided such that the proposed single-to-balanced bandpass filters can achieve very compact size when implemented on chip. They can be designed with the desired bandpass response and reference impedances through the proposed equivalent-circuit models and design equations. In addition, by introducing two cross-coupled capacitors, one tunable transmission zero can be achieved in either the lower or upper stopband to improve the selectivity. Specifically, two third-order single-to-balanced bandpass filter designs in commercial pHEMT process on 4-mil GaAs substrate with different transmission zero locations are presented. The circuit size is less than 1.02 mm × 0.86 mm for a center frequency of 5.5 GHz and a bandwidth of about 18.18%. The corresponding electrical size is only 0. 054λ g × 0.045λ g at the center frequency. Good selectivity and balanced performance are demonstrated.

Original languageEnglish
Article number6075288
Pages (from-to)3322-3330
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Volume59
Issue number12 PART 2
DOIs
StatePublished - Dec 2011

Keywords

  • Balun
  • bandpass filter
  • coupled-line
  • GaAs
  • transmission zero

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