A Selective Wideband Bandpass Filter With Wide Stopband Using Mixed Lumped-Distributed Circuits

IF 4.6 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Circuits and Systems II: Express Briefs Pub Date : 2022-03-09 DOI:10.1109/TCSII.2022.3173472

Vinay B. Narayane;Girish Kumar

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引用次数: 3

Abstract

In this brief, a wideband bandpass filter with extremely wide spurious-free stopband and high selectivity is presented. The filter consists of a wideband bandpass cell cascaded with sharp-rejection wide-stopband low-pass filters (WSLPFs), both designed using a mix of lumped and distributed elements. The proposed wideband bandpass cell, consisting of two series LC resonators and shunt-connected open-ended microstrip stubs, produces a three-pole passband with two transmission zeros on its opposite sides. The LC resonators provide suppression of spurious transmission peaks arising due to the main stub, which is further enhanced by the auxiliary stubs in the wideband cell and the WSLPFs. The design technique imbibes the effects of the self-resonating frequencies of the lumped components, and thus enable the filter to achieve the stopband extension irrespective of their size and make. A prototype of the proposed filter, designed at 1.25 GHz with 62.4% bandwidth, shows the stopband extended up to 18.6 times the center frequency with minimum rejection of 19 dB. The selectivity factor of the passband, defined as the 3-dB to 30-dB bandwidth ratio, is 0.65. The maximum filter dimension is less than a quarter of the wavelength at the center frequency, providing a miniature design.

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基于混合集总分布式电路的宽阻带选择性宽带带通滤波器

本文介绍了一种具有超宽无杂散阻带和高选择性的宽带带通滤波器。该滤波器由一个宽带带通单元组成，该单元与锐抑制宽阻带低通滤波器（WSLPF）级联，两者都是使用集总和分布式元件的混合设计的。所提出的宽带带通单元由两个串联LC谐振器和并联的开放式微带短截线组成，在其相对侧产生具有两个传输零点的三极通带。LC谐振器提供对由主短截线引起的寄生传输峰值的抑制，该寄生传输峰值通过宽带单元和WSLPF中的辅助短截线而进一步增强。该设计技术吸收了集总组件的自谐振频率的影响，从而使滤波器能够实现阻带扩展，而与它们的尺寸和制造无关。所提出的滤波器的原型设计在1.25GHz，带宽为62.4%，阻带扩展到中心频率的18.6倍，最小抑制为19dB。通带的选择性因子，定义为3dB与30dB的带宽比，为0.65。最大滤波器尺寸小于中心频率下波长的四分之一，提供了一种微型设计。

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来源期刊

IEEE Transactions on Circuits and Systems II: Express Briefs 工程技术-工程：电子与电气

CiteScore

7.90

自引率

20.50%

发文量

883

审稿时长

3.0 months

期刊介绍： TCAS II publishes brief papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: Circuits: Analog, Digital and Mixed Signal Circuits and Systems Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic Circuits and Systems, Power Electronics and Systems Software for Analog-and-Logic Circuits and Systems Control aspects of Circuits and Systems.