22 IEEE A&E SYSTEMS MAGAZINE MARCH 2015 Band Pass Filter Bank Design (250–500 MHz) for Radio Astronomy Application Based on Metamaterial ZOR Techniques Sougata Chatterjee, Anil Raut, Suresh Kumar Front End Group, Giant Metrewave Radio Telescope Pune, India INTRODUCTION M HWDPDWHULDO 070 LV DQ DUWLｿFLDO FRPSRVLWH PDWHULDO IRU ZKLFK ZH FDQ FKDQJH LWV HOHFWURPDJQHWLF SURSHUWLHV >@ 7KH HTXLYDOHQW FLUFXLW DSSURDFK RI 070 ZDV GHYHORSHG E\ &DOR] DQG ,WRK >@ DQG 6DQDGD HW DO >@ DQG WKLV DSSURDFK KDV OHG WR WKH FRQFHSW RI FRPSRVLWH ULJKW DQG OHIWKDQGHG &5/+ PDWHUL DOV 7KLV FRQFHSW IXOO\ WDNHV LQWR DFFRXQW WKH SDUDVLWLF ULJKWKDQGHG 5+ HIIHFWV ZKLFK LV XQDYRLGDEOH LQ D SUDFWLFDO DSSOLFDWLRQ 7KH ]HURWKRUGHU UHVRQDWRU =25 KDV WKH PRGH QXPEHU ]HUR DQG LWV UHVRQDWRU OHQJWK LV LQYDULDQW RI LWV ZDYHOHQJWK 6DQDGD HW DO >@ ｿUVW SURSRVHG 070=25 DQG UHDOL]HG LW LQ PLFURVWULS FRQｿJXUDWLRQ 8VLQJ WKH 070=25 WHFKQLTXH VHYHUDO UHVHDUFKHUV >@ｱ>@ KDYH GHVLJQHG EDQG SDVV ｿOWHUV %3)V LQ GLIIHUHQW IUHTXHQF\ EDQGV 7KH *LDQW 0HWUHZDYH 5DGLR 7HOHVFRSH *057 LV WKH ZRUOGｶV ODUJHVW PHWHU ZDYHOHQJWK UDGLR WHOHVFRSH VHH 6ZDUXS HW DO >@ ,Q WKH FXUUHQW XSJUDGH RI WKH *057 UHFHLYHU V\VWHP ｱ 0+] ZH KDYH UHGHVLJQHG %3)V XVLQJ 070=25 WHFKQLTXHV LQ WKH IRO ORZLQJ EDQGV ｱ ｱ ｱ DQG ｱ 0+]  G% EDQGZLGWK $ OLWHUDWXUH VXUYH\ VKRZV WKDW ORZIUHTXHQF\ GHVLJQ ZLWKLQ D FRQVWUDLQHG VL]H KDV QRW EHHQ SUHYLRXVO\ DWWHPSWHG 7KLV DU WLFOH GHVFULEHV EULHﾀ\ D XQLW FHOO RI 070=25 DQG SURFHHGV IXUWKHU LQWR WKH GHVLJQ RI D ｿYHSROH %3) DW D ｱ 0+] EDQG 8VLQJ D SDUDPHWULF DSSURDFK RXU GHVLJQV ZHUH RSWLPL]HG WR REWDLQ D JRRG EDQGZLGWK DQG JRRG UROORII UHVSRQVH 7KH VLPXODWLRQ ZDV FDUULHG RXW XVLQJ PHWKRG RI PRPHQWV $'6 VRIWZDUH 7KH IDEULFDWHG %3) ZDV LQVWDOOHG LQ WKH XSJUDGHG *057 V\VWHP >@ MTM-ZOR BPF DESIGN FOR 420–520 MHZ 7KH XQLW FHOO RI D 070 WUDQVPLVVLRQ OLQH 7/ LV D VHULHV FRQ VLVWLQJ RI D VKXQW FDSDFLWRU C L  DQG DQ LQGXFWRU L L  ZKHUH WKH SURSDJDWLRQ FRQVWDQW ȕ LV QHJDWLYH LQ D VSHFLｿF IUHTXHQF\ EDQG )LJXUH  7KLV W\SH RI 7/ LV FDOOHG D SHULRGLFDOO\ OHIWKDQGHG WUDQVPLVVLRQ OLQH 3/7/ 3DUDVLWLF 5+ HIIHFWV KDPSHU WKH GH VLJQLQJ RI D SXUH 3/7/ KHQFH WKH 070 ORDGHG OLQH LV FDOOHG D &5/+ 7/ >@ >@ ,Q WKH &5/+ 7/ WKH UHVRQDQFH FRQGLWLRQV DUH DV IROORZV   Authors’ current address: S. Chatterjee, A. Raut, S. Kumar, Front End Group, Giant Metrewave Radio Telescope (GMRT), NCRA-TIFR, Pune-410504, India, E-mail: (sougata.sameer@ gmail.com). 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. 8QLW FHOO PRGHO RI 0707/ Figure 2. ,QWHUGLJLWDO FDSDFLWRU ZLWK JURXQGHG VWXE