Download - Band Pass Filter Bank Design (250–500 MHz) for Radio Astronomy Application Based on Metamaterial ZOR Techniques

22 IEEE A&E SYSTEMS MAGAZINE MARCH 2015

Band Pass Filter Bank Design (250–500 MHz) for Radio Astronomy Application Based on Metamaterial ZOR TechniquesSougata Chatterjee, Anil Raut, Suresh KumarFront End Group, Giant Metrewave Radio Telescope Pune, India

INTRODUCTION

M

MTM-ZOR BPF DESIGN FOR 420–520 MHZ

CL LL

Authors’ current address: S. Chatterjee, A. Raut, S. Kumar, Front End Group, Giant Metrewave Radio Telescope (GMRT), NCRA-TIFR, Pune-410504, India, E-mail: ([email protected]). Manuscript received October 24, 2014, and ready for publica-tion December 16, 2014. DOI No. 10.1109/MAES.2015.140072. Review handled by M. De Santos. 0885/8985/15/$26.00© 2015 IEEE

Figure 1.

Figure 2.

MARCH 2015 IEEE A&E SYSTEMS MAGAZINE 23

fse fsh fL fR fO

fse is equal fsh

where n LK K

where W S

where

kg

h t

Figure 3. Figure 4.


Band Pass F i l ter Bank Design for Radio Astronomy Appl icat ion Based on Metamater ia l ZOR Techniques

W L S

n Wg LgCL

LR LLCR

/

BPF BANDWIDTH AND ROLL-OFF CONTROL

(L L L

Table 1.

Specifications for Five-Pole Filter for 420–520 MHz

Item Specification

Central frequency(f0) 470 MHz

Bandwidth (6dB) 100 MHz

Insertion loss < 3 dB

Return loss in the pass band 10 dB

Sharp skirt (Attenuation at fue+30 MHz)

20 dB

Figure 5.

Figure 6.


Chatter jee, Raut , and Kumar

MTM-ZOR-BASED FILTER BANK DESIGN

SIZE REDUCTION OF FILTER

USING MTM-ZOR

Figure 7.

Figure 9.

Figure 8.



Table 2.

Design Dimensions of the Filter After Modification to the Frequency Range of

420–520 MHz (All Dimensions Are in Millimeters)

Design Parameter 420-520 MHz

ZOR-1 W, S, Wp, L 0.527, 0.11, 0.125, 8.7595

WF , LF 0.8, 5.6

Ls1, Ls2, ls3, ls4

,Ws8.01, 4.005, 2.0025, 2.0035, 0.555

LIRC, WIRC 3.1, 0.3

ZOR-2 W, S, Wp, L 0.562, 0.11, 1.35, 6.52

Ls1, Ls2, Ls3, ls4, Ws 8.9957, 4.49785, 2.248925, 2.248925, 0.69

LIRC, WIRC 2.5, 0.7

ZOR-3 W, S, Wp, L 0.585, 0.11, 1.21, 6

Ls1, Ls2, Ls3, Ws 9.9546, 4.9773, 4.9773, 0.69

LIRC, WIRC 2.5, 0.7

Table 3.

Fabricated Design of the Modified Filter and Its Experimental Results

Design Parameter Expected Achieved

Band width (6 dB) 420–520 MHz 411–517 MHz

Insertion loss 2.0–3.0 dB (470 MHz) 2 dB (470 MHz)

Return loss 10 dB over the band 10 dB over the band

Higher frequency cutoff +30MHz 30 dB (550 MHz) 32 dB (547MHz)

Table 4.

Design Dimensions for the Four Subband Filters That Were Fabricated (All Dimensions Are in Millimeters)

420–520 MHz 360–460 MHz 300–400 MHz 240–340 MHz

ZOR-1 W, S, Wp, L 0.527, 0.11, 0.125, 8.7595

0.54, 0.11, 0.16, 10.5 0.587, 0.1, 0.165, 11.9 5.45, 0.1, 0.267, 18.364

WF , LF0.8, 5.6 4.5, 0.8 0.9, 5 0.8, 5

Ls1, Ls2, ls3, ls4

, Ws8.01, 4.005, 2.0025, 2.0035, 0.555

8.854, 4.4595, 2.22745, 2.22745, 0.555

9.85, 4.925, 2.4625, 2.4625, 0.555

10.85, 5.425, 2.7125, 2.7125, 0.555

LIRC, WIRC 3.1, 0.3 4.1, 0.3 4.2, 0.2 4.2, 0.2

ZOR-2 W, S, Wp, L 0.562, 0.11, 1.35, 6.52 0.555, 0.11, 1, 8.67 0.571, 0.1, 0.9, 9.5 0.55, 0.1, 1.1, 14.6

Ls1, Ls2, Ls3, ls4, Ws 8.9957, 4.49785, 2.248925, 2.248925, 0.69

9.8341, 4.9701, 2.4585, 2.4583, 0.69

11.35, 5.675, 2.8375, 2.8375, 0.69

12.35, 6.175, 3.0875, 3.0875, 0.69

LIRC, WIRC 2.5, 0.7 2.5, 1 2.5, 0.9 2.5, 1.2

ZOR-3 W, S, Wp, L 0.585, 0.11, 1.21 0.54, 0.11, 0.95, 7.763 0.565, 0.1, 0.8, 9 0.56, 0.1, 1.1, 13.9

Ls1, Ls2, Ls3, Ws 9.9546, 4.9773, 4.9773, 0.69

10.82, 5.14, 2.57, 0.69 12.35, 6.175, 6.175, 0.69

13.35, 6.675, 6.675, 0.69

LIRC, WIRC 2.5, 07 2.5, 1 2.5, 0.9 2.5, 1.2



Figure 10.



CONCLUSION

ACKNOWLEDGMENTS

Figure 11.

Figure 12.

Figure 13.

Table 5.

Measured Results for the Other Three Subbands

Design Parameter Achieved (Expected) Achieved (Expected) Achieved (Expected)

Band width(6 dB) 352–454 MHz

(360–460 MHz)

311–405 MHz

(300–400 MHz)

255–343 MHz

(240–340 MHz)

Insertion loss 1.96 dB (400 MHz)

(2.0–3.0 dB (400 MHz))

1.79 dB (350 MHz)

(2.0–3.0 dB (350 MHz))

1.81 dB (290 MHz)

(2.0–3.0 dB (290 MHz))



REFERENCES

Uspekhi Fizicheskikh Nauk,

IET Microwaves, Antennas & Propagation,

Proceedings of the 39th European Microwave Conference,

Progress in Electromagnetics Re-search C,

IEEE Microwave and Wireless Components Letters,

Electromagnetics Metamaterial: Transmission Line Theory and Microwave Application.

Current Science,

IOP Conference Series: Material Science and En-gineering.