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Miniaturized dual-band filter with return loss bandwidth and transmission zero control

  • Di Lu (a1) (a2), N. Scott Barker (a2) and Xiao-Hong Tang (a1)

Abstract

In this paper, a compact dual-band bandpass filter (DB-BPF) using new dual-mode resonator-loaded resonators (DM-RLRs) is presented and investigated to simultaneously achieve controllable return loss (RL), bandwidth (BW) and transmission zeros (TZs), and the simple strategy for this type of filter design is proposed. The DB-BPF consists of two high-flexibility DM-RLRs with separated electric and magnetic coupling (SEMC). Specifically, the proposed DM-RLR provides the DB-BPF with center frequency control as well as RL control, and SEMC is utilized for the BW and TZ control. To facilitate the design, a simple optimization-based design strategy is proposed and employed, resulting in an example layout. Finally, the example filter, with center frequencies of 1.57 GHz (channel 1 for GPS) and 3.5 GHz (channel 2 for WiMAX), is fabricated and measured. The measurement insertion loss and RL are 0.9/0.9 and 17/20 dB. The fabricated DB-BPF also exhibits a compact size of 0.12λg × 0.08λg at 1.57 GHz.

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Corresponding author

Corresponding author: D. Lu Email: ludi888abc@hotmail.com or dl3ap@virgina.edu

References

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Keywords

Miniaturized dual-band filter with return loss bandwidth and transmission zero control

  • Di Lu (a1) (a2), N. Scott Barker (a2) and Xiao-Hong Tang (a1)

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