Design And Development Of Bandwidth Enhanced Metamaterials For Rf Filters And Antennas

Abstract

Today s wireless communication demands higher frequency bandwidth to meet data newlinerate and channel capacity requirement. The latest wireless technologies like telecommunication (5G) (frequency, 3300-5000 MHz) andWireless Local Area Network (WLAN) (frequency, 2400-2500 MHz and 5151-5850 MHz) include additional frequency bands to get higher data rates and large channel bandwidth. So, the present work is done towards design of miniaturized multiband or wideband metamaterial unit cell, radio Frequency (RF) filters and antenna for 5G and WLAN application. Here initially, a frequency tuning technique is proposed using Tri-Ring Resonator (TRR) to develop wideband stopband RF filter for narrow frequency band without altering unit cell dimension. Later, the traditional method of increasing number of order to increase frequency bandwidth operation is used to design and develop wideband stopband RF filter. The frequency tuning technique is adapted to improve wideband stopband RF filter response further with 3rd order TRR. Using frequency tuning technique, the filter rejection bandwidth is improved from 5% to 20% with 3rd order TRR. Next proposed design consists of a new Compact Bend Triangular Resonator (CBTR), which is single negative unit cell, but it shows low rejection and narrow band resonance. The CBTR performance is improved by implementing 4th order CBTR and called as a Quad Compact Bend Triangular newlineResonator (QBTR). The QBTR used as a unit cell and is loaded in microstrip line newlineto develop stopband RF filter, where 27.32% bandwidth is achieved for 20 dB rejection with 3rd order QBTR. The metasurface also have received considerable attention in recent years. These structures are normally periodic in nature. The metasurface are considered very promising and it is used to suppress interference, surface wave, RF coupling and to increase directivity of antenna. In this research study ground backed QBTR is proposed as metasurface. The ground backed QBTR shows wideband operating range (55.3%) for inphase reflection.