An active‐passive cascaded bandpass filter with an 88 kHz–1.1 GHz bandwidth on substrate‐integrated suspended line platform

This letter proposes an active‐passive cascaded bandpass filter based on the substrate‐integrated suspended line platform for the first time. By cascading an active‐RC highpass circuit with a passive‐LC lowpass filter circuit, the proposed filter achieves a GHz bandwidth, an extremely low cut‐off fr...

Full description

Saved in:
Bibliographic Details
Published in:Microwave and optical technology letters 2023-02, Vol.65 (2), p.541-547
Main Authors: Yang, Zhuojun, Ma, Kaixue, Wang, Yongqiang, Yan, Ningning
Format: Article
Language:English
Subjects:
active‐passive cascaded structure
bandpass filter (BPF)
DC‐offset cancellation (DCOC)
low cut‐off frequency
SISL platform
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This letter proposes an active‐passive cascaded bandpass filter based on the substrate‐integrated suspended line platform for the first time. By cascading an active‐RC highpass circuit with a passive‐LC lowpass filter circuit, the proposed filter achieves a GHz bandwidth, an extremely low cut‐off frequency, and a controllable in‐band gain. It has the advantages of compact size, DC‐offset cancellation, and self‐packaging. As proof of concept, a sixth‐order bandpass filter was designed and fabricated. The measured 3‐dB bandwidth is from 88 kHz to 1.1 GHz with a 5.8 dB in‐band gain, and the circuit area is only 0.021 × 0.022 λg, where λg is the guided wavelength at 0.55 GHz.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.33537