Abstract
This letter details the design and validation of a monolithic microwave integrated circuit (MMIC) active bandpass filter (BPF) with nonreciprocal and quasi-elliptic-type response. Its architecture is based on cascaded active frequency-selective stages. Each stage is shaped by a resonant cell that introduces one transmission pole or one pole and two transmission zeros (TZs). The overall filter exhibits a three-pole/two-TZ response. Each stage is comprised of two FETs with a passive resonant cell connected between them. The FETs introduce gain to counteract the loss of the MMIC components. Due to their near-unilateral behavior, a nonreciprocal transfer function is obtained. Thus, the proposed device functions as a co-designed BPF/isolator. The operating principles of the active BPF are characterized through simulated examples. For validation, a GaAs prototype was developed at <inline-formula> <tex-math notation="LaTeX">$X$</tex-math> </inline-formula>-band. It demonstrates a variable amount of gain in the forward direction of transmission and a highly isolated reverse transmission with <inline-formula> <tex-math notation="LaTeX">$>$</tex-math> </inline-formula>60 dB of isolation.
| Original language | English |
|---|---|
| Pages (from-to) | 1-4 |
| Number of pages | 4 |
| Journal | IEEE Microwave and Wireless Components Letters |
| DOIs | |
| Publication status | Accepted/In press - 2022 |
Keywords
- Active filter
- Band-pass filters
- bandpass filter (BPF)
- Computer architecture
- Field effect transistors
- GaAs
- Microprocessors
- monolithic microwave integrated circuit (MMIC)
- Resonant frequency
- Topology
- Transfer functions