Microstrip Bandpass Filter Design using EDA Tolol such as keysight ADS and Ansys HFSS along with its Fabrication

1. Society for Applied Microwave Electronics Engineering & Research Kolkata
Center
Ministry of Electronics & Information Technology
Government of India
Work Based Learning (WBL-Level2)
Assessment-1
Duration : 9th September 2023 to 9th March 2024
Presented By
Gaurav Bharti
Co-ordinator Supervisor
Dr.Satyajit Chakraborty Mr. Aritra Banerjee
Scientist Scientist

2. Objective
Design of 5th Order Parallel Coupled
Microstrip Band pass filter
• To Design a 5th Order Parallel Coupled Microtrip
Bandpass Filter Which operates at the centre frequency of
4 GHz whose FBW%=12.5 % Having Passband Ripple 0.2dB
•To Gain Hands on experience of Designing & Simulation of
microstrip Bandpass Filter Followed by its Fabrication &
Testing.

3. Bandpass Filter Design specification:
• Centre Frequency : 4 GHz
• 3dB Bandwidth : 0.5 GHz
• Impedance : 50Ω
• Order of the Filter (n) : 5
• Fractional BW% : 12.5%
• Passband Ripple : 0.2dB
• Substrate : Rogers RT/Duroid 5880
• Dielectric constant(εr ) : 2.2
• tangential loss (tan δ) : 0.0004
• Substrate’s Thickness : 10 mil

4. The Normalized 5th Order Tchebyshev Low-pass
Prototype Filter’s Element Values
• n
• g values at (0.2dB rip
n g values at (0.2dB ripple)
L1-C1 1.3394
L2-C2 1.3370
L3-C3 2.1660
L4-C4 1.3370
L5-C5 1.3394
RL /Rs
1.0000
Further, Low-pass Prototype Filter is Impedance Scaled &
Frequency Transformed As Per Required Design Specification

5. Lumped Circuit Design

6. Simulation Graph of Lumped Circuit Design

7. Calculation of Admittance Inverter & even – Odd
Impedance
SN (ZoJ) Admittance
inverter
Zoe(even
impedance)
Zoo ( odd
Impedance)
J01 0.3827803943 76.46 38.18
J12 0.1466522784 58.40 43.74
J23 0.1153226824 56 44.89
J34 0.1153226824 56 44.89
J45 0.1466522784 58.40 43.74
J56 0.3827803943 76.46 38.18

9. Simulation Graph of S-parameter of ideal CLIN Schematic design

10. S-parameter simulation Graph of ideal CLIN Schematic design _ to show S(1,1) at 4 GHz

11. The next step of the filter Design is to find out physical Dimensions of
Coupled Lines Resonators that are based on even –odd and characterstic
impedances . Which is calculated using ADS Software tool – Linecal

12. Width, Spacing, Length of Coupled line as per Even and Odd
mode impedances calculated using ADS tool :- Linecal
Resonators W ( mm) S(mm) L( mm)
1 0.60 0.042 14.12
2 0.71 0.21 13.81
3 0.73 0.30 13.77
4 0.73 0.30 13.77
5 0.71 0.21 13.81
6 0.60 0.042 14.12

14. Microstrip Parallel Coupled Line Bandpass filter Design Based on even-odd Impedances's
physical parameters simulation Graph

15. Optimized and Tuned Physical
Dimensions
Resonators W ( mm) S(mm) L( mm)
1 0.32 0.125 13.88
2 0.63 0.21 13.88
3 0.125 0.26 13.63
4 0.125 0.26 13.63
5 0.63 0.21 13.88
6 0.32 0.125 13.88

17. Microstrip Parallel Coupled Line Bandpass filter optimized and tuned Design S parameter
Graph

18. Substrate Details

19. Layout generated from optimized schematic Design

20. S-Parameter Graph of Layout generated from optimized schematic

21. Optimized Layout Structure
Tapered sections have been used to connect Quarter wavelength line

22. Optimized Layout Graph (S- Parameter)

23. Ansys HFSS Simulated Layout

24. HFSS Simulated Layout

25. Ansys HFSS Simulated Layout Graph

26. Conclusion
Requirement Outcome
3dB Bandwidth (3.75GHz – 4.25
GHz)= 0.5 GHz
3dB Bandwidth (3.73GHz-
4.23GHz)= 0.5 GHz
Insertion Loss -1.50dB
Return Loss Min- -13dB
Max- -31.5dB
Filter’s Layout
dimension
Length= 98.800mm
Width = 5.46mm
Further work to be carried out
•Fabrication
•Testing

27. Thank You!