International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
www.irjet.net
PERFORMANCE ANALYSIS OF PLANAR BANDPASS FILTER WITH DIFFERENT ORDERS Hrishika1, Priyanka Pradhan2 1 M-Tech Student, Department of Electronics & Telecommunication Engineering,
Lakshmi Narain College of Technology, Indore M.P. INDIA
2 Assistant Professor, Department of Electronics & Telecommunication Engineering,
Lakshmi Narain College of Technology, Indore M.P. INDIA ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Filter is a very essential component in modern
and return loss as detailed in [4], reduce the size as detailed in [5], cost reduction as detailed in [6], variable frequency as detailed in [9], variable bandwidth as detailed in [9]. Having analyzed various works of literature, it is essential to analyse the effect of order while filter design.
communication system as it is used to separate out desired signal from entire range of frequency so as to process the signal to acquire the required output. In this work bandpass filters are designed on microstrip patterns through coupled line topology by using the design equations available in literatures at 4.9 GHz frequency on FR4 substrate with dielectric constant 4.5 and same is implemented in commercial simulation software. Subsequently, the coupled line filter topology is attempted with different orders namely 3rd order, 4th order, and fifth order and the effect various orders in filter performance is analysed in terms of insertion loss, return loss, bandwidth, roll-off etc. Further, a comparative analysis is carried out among all the designs and feasibility of practical implementation is discussed in this article.
In this research work, a microstrip-based coupled line filter is designed on FR-4 substrate using the design equations available in the literature [10]. Subsequently, similar type of filters are designed with different orders namely third order, forth order and fifth order. All the mentioned filters are simulated in Keysight ADS software and comparative analysis is carried out among their performances. In the end the feasibility for practical implementation of the same is detailed in this article.
2. DESIGN PRINCIPLE
Key Words: Bandwidth, Filter, pass band, microstrip, stop band, roll-off, etc.
In order to design a band pass filter, firstly a low pass filter prototype is designed and subsequently same is extrapolated to band pass filter. In the process of designing microstrip based coupled line filters following equations are employed-
1.INTRODUCTION Modern communication system is being migrated from VHF band to UHF and SHF bands hence all the systems need to be realised at mentioned frequency bands. In communication system filter is very important aspect as it allow the desired frequency signal to pass and eliminate the unwanted frequency signals [1]. The performance of filter also getting refined day by day and insertion loss, return loss, bandwidth, roll off etc. have become key performance indicators for any filter. Now a day’s most of the filters are operated at microwave frequency band and on that frequency band, designing a filter using lumped components is practically not possible hence the design approach is shifted towards other alternative technologies namely waveguide based filter [2], microstrip based filter [4], meta-material based filter [3], LTCC filters [8], SAW filter [7], SIW based filter [5] etc. Among the available technologies, microstrip based filters are best choice for this study and for commercial applications too, as it has ability to work at high frequency, small size, light weight, low cost and feasibility to integrate with other components.
-----(3) where g0 , g1 ,..., gN are the element values of a ladder-type low pass prototype with a normalized cut-off frequency Ωc =1. The fractional bandwidth of a band pass filter, defined as FBW, is equal to:
A lot of research is carried out on microstrip based filter design to improve the performance in terms of insertion loss
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