Synthesis and Design Of Microwave Components

RF analog filters play a key role in any wireless communication RF front end.  An early development of microwave filters stared in 1937. Back then filters are mostly used in communication systems developed for World War II.  The first reported technique for filter design is known as image

Project Title

Synthesis and Design Of Microwave Components

Project Area of Specialization

Internet of Things

Project Summary

RF analog filters play a key role in any wireless communication RF front end.  An early development of microwave filters stared in 1937. Back then filters are mostly used in communication systems developed for World War II.  The first reported technique for filter design is known as image parameter method. Later on, researchers have proposed different design techniques using lumped elements. Moreover, in 1940 a precise design method was introduced with two specific design steps, the first step was a determination of transfer function that met the required specifications, then using a frequency response estimated by transfer function. The second step was to synthesize the circuit using Darlington synthesis method. Moreover, extensive work was done on fabrication techniques which includes Waveguide, Stripline, Bulkwave, SAW and many more.

Generally, filters are used for frequency spectrum allocation and preservation, interference reduction, receiver’s protection, elimination of unwanted harmonics and Intermodulation products generated from nonlinear devices, signal processing and spectrum shaping and frequency multiplexing. Due to all the above-mentioned application, it is evident that the quantity of filters used in a wireless communication system is diametrically increased.

In accordance with the frequency response, filters are categorized into four types which are lowpass, highpass, bandpass, and bandstop. The most used filter type in a wireless communication system is a bandpass filter. A typical example of bandpass filter in a wireless system is to transmit or receive certain band of frequencies while suppressing the rest of the frequencies. With every new wireless technology standards, the need for analog filters is indispensable. In recent years, the IEEE standard 802.24 is standardizing the 5G wireless local area network (WLAN) operating at 5.5 GHz. In order to fulfill the given frequency band specifications for 5G WLAN, the broadband bandpass filter is designed and fabricated in the recent years. However, the back compatibility with 2.4 GHz WLAN is also required for existing systems. Alongside local area network, WiMAX transceiver can be incorporated for wide area coverage. To fulfill the requirement of such heterogeneous systems a multi-band bandpass filter is highly desired. There are several design techniques of multiband filters have been reported. However, these designs are complex, difficult to fabricate due to parameter limitations.

Project Objectives

The main objective of  this project is to synthesis and design the microstrip components for RF front end devices such as microwave filters (Low pass, High pass, Band pass, Band stop) Antennas, power dividers etc. 

Project Implementation Method

There are three main objectives of this project:

• The theoretical model of proposed triple band bandpass filter.
• Based on theoretical results, microstrip, and full-wave EM simulation will be conducted on Advanced Design System.
• To validate the proposed design microstrip fabrication will be done on Roger substrate.

Benefits of the Project

Miniaturized RF components are one major challenge in the development of future wireless communications systems. Systems like 5th generation WLAN works on wide bandwidth of 5.15 to 5.85 GHz. Moreover, the back compatibility with 2.4 GHz WLAN is also required for existing systems. Alongside local area network, WiMAX transceiver can be incorporated for wide area coverage. To fulfill the requirement of such heterogeneous systems a multi-band bandpass filter is highly desired. There are several design techniques of multiband filters have been reported. However, the reported designs are complex, difficult to fabricate due to parameter limitations. In this proposal, an exact synthesis and design procedure of proposed filter will be presented. Moreover, a compact, low cost, and easily fabricated tri-band bandpass filter will be validated.

Technical Details of Final Deliverable

This project will present different types of microstrip filters using multiple resonators. The electrical design parameters will be converted to physical parameters using line calculator. Using the extracted physical parameters, a micro strip-based circuit will be designed to incorporate the substrate losses. . . . The micro strip design will be translated into a layout for full-wave EM simulation. The co-simulation optimization and tuning will be performed to minimize the substrate and line bending losses. The final layout shows very stable electrical performance. To validate the proposed triband band pass filter design, Micro strip-based fabrication is done using Roger Duroid substrate 5880. The measurements are done on Agilent Network Analyzer N5242A. The simulated and measured results show good agreement. 

Final Deliverable of the Project

Hardware System

Type of Industry

Telecommunication

Technologies

Others

Sustainable Development Goals

Industry, Innovation and Infrastructure

Required Resources

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