{"title":"Wideband Tunable RF Filters for Channel Selection in Crowded Spectral Bands","authors":"Sanghoon Park, Ki-Jin Kim, Kwang-Ho Ahn, Hyeon-Woo Lee","volume":82,"journal":"International Journal of Electronics and Communication Engineering","pagesStart":1342,"pagesEnd":1347,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/17182","abstract":"
It is very effective way to utilize a very wide tunable filter in co-existing multi-standards wireless communications environment. Especially, as the long term evolution (LTE) communication era has come, the multi-band coverage is one of the important features required for the RF components. In this paper, we present the frequency conversion technique, and so generate two types of RF filters which are specially designed for the superb tunable ability to support multiple wireless communication standards. With the help of a complex mixing structure, the inherent image signal is suppressed. The RF band-pass filter (BPF) and notch filter achieve 1.8dB and 1.6dB insertion losses and 18 dB and 17 dB attenuations, respectively. The quality factor show greater than 30.<\/p>\r\n","references":"[1] W. D. Yan and R. R. Mansour, \u201cTunable dielectric resonator bandpass \r\nfilter with embedded MEMS tuning elements,\u201d IEEE Trans. Microw. \r\nTheory Tech., vol. 55, no. 1, pp. 154\u2013160, Jan. 2007. \r\n[2] I. Reines, A. Brown, M. El-Tanani, A. Grichener, and G. Rebeiz, \u201c1.6\u20132.4 \r\nGHz RF MEMS tunable 3-pole suspended combline filter,\u201d in Proc.IEEE \r\nMTT-S International Microwave Symposium Digest, 15\u201320 June 2008, \r\npp. 133\u2013136. \r\n[3] N. Shigekawa, K. Nishimura, T. Suemitsu, H. Yokoyama, and K. \r\nHohkawa, \u201cSAW filters composed of interdigital schottky and ohmic \r\ncontacts on AlGaN\/GaN heterostructures,\u201d IEEE Electron Device Lett., \r\nvol. 28, no. 2, pp. 90\u201392, Feb. 2007. \r\n[4] F. Shiba, M. Yamazaki, O. Iijima, and H. Yatsuda, \u201cGPS SAW filter \r\nusing a wafer level technique,\u201d in Proc. IEEE Ultrasonics Symposium, \r\n28\u201331 Oct. 2007, pp. 937\u2013940. \r\n[5] A. Yoshizawa and Y. Tsividis, \u201cA channel-select filter with agile blocker \r\ndetection and adaptive power dissipation,\u201d IEEE J. Solid-State Circuits, \r\nvol. 42, no. 5, pp. 1090\u20131099, May 2007. \r\n[6] Y. Palaskas and Y. Tsividis, \u201cPower-area-DR-frequency-selectivity \r\ntradeoffs in weakly nonlinear active filters,\u201d in Proc. International \r\nSymposium on Circuits and Systems ISCAS \u201903, vol. 1, 25\u201328 May 2003, \r\npp. I\u2013453\u2013I\u2013456. \r\n[7] A. Yoshizawa and Y. Tsividis, \u201cA channel-select filter with agile blocker \r\ndetection and adaptive power dissipation,\u201d IEEE J. Solid-State Circuits, \r\nvol. 42, no. 5, pp. 1090\u20131099, May 2007. \r\n[8] Y. Palaskas and Y. Tsividis, \u201cPower-area-DR-frequency-selectivity \r\ntradeoffs in weakly nonlinear active filters,\u201d in Proc. International \r\nSymposium on Circuits and Systems ISCAS \u201903, vol. 1, 25\u201328 May 2003, \r\npp. I\u2013453\u2013I\u2013456. \r\n[9] H. Khatri, L. Liu, T. Chang, P. S. Gudem, and L. E. Larson, \u201cA SAW-less \r\nCDMA receiver front-end with single-ended LNA and single-balanced \r\nmixer with 25% duty-cycle LO in 65nm CMOS,\u201d in Proc. IEEE Radio \r\nFrequency Integrated Circuits Symposium RFIC 2009, 7\u20139 June 2009, \r\npp. 13\u201316. [10] J. Mitola III, \u201cCognitive radio for flexible mobile multimedia\r\ncommunications,\" in Proc. IEEE International Workshop on Mobile\r\nMultimedia Communications, 15-17 Nov. 1999, pp. 3-10.\r\n[11] IEEE 802.22 Working Group, http:\/\/www.ieee802.org\/ 22\/.\r\n[12] FCC, \u201cIn the matter of unlicensed operation in the TV broadcast bands:\r\nsecond report and order and memorandum opinion and order,\u201d Tech. Rep.\r\n08-260, Nov. 14 2008.\r\n[13] S. Haykin, \u201cCognitive radio: brain-empowered wireless communications,\u201d\r\nIEEE J. Sel. Areas Commun., vol. 23, no. 2, pp. 201\u2013220, Feb\r\n2005.\r\n[14] E. Au, G. Chouinard, and Z. Lei, \"IEEE P802.22 wireless RANs receiver\r\nperformance evaluation criteria,\" IEEE 802.22-08\/0326r2,\r\nhttp:\/\/www.ieee802. org\/22\/, Dec. 2008.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 82, 2013"}