Compact Bandwidth-Extended CRLH-TL based Monopole Antenna

Enhanced Monopole Antenna for On-Chip E-Band Applications

“…For years, in order to improve the gain, directivity, and radiation efficiency while keeping the size of the antennas small, different types of metamaterials have been proposed, such as artificial magnetic conductors [1,2], high-impedance surfaces [3,4], electromagnetic band rejecting structures [5], doubly negative materials [6,7], zero-order resonators [8], composite left-righthanded metamaterials [9], and metasurfaces [10] and the use of split ring resonators and their complement [11][12][13].…”

A Tri-mode Hybrid Antenna for Quad-band Applications

“…Narrow bandwidth restricts the ability of ZOR antennas to satisfy the communication needs of modern multifunctional smart devices. To achieve a wider bandwidth, two methods have been adopted in recent literature [10][11][12][13][14][15][16][17][18][19]. The first method is to lower the Q-factor of the ZOR by changing the distributed element values [10][11][12][13][14][15].…”

“…The first method is to lower the Q-factor of the ZOR by changing the distributed element values [10][11][12][13][14][15]. The second method is to excite another working mode of the ZOR antenna, such as the first negative order resonance (FNOR) mode, the first positive order resonance (FPOR) mode, and then combine them to yield a wider bandwidth [16][17][18][19]. Although these methods have widened the bandwidth of ZOR antenna to some degree, the improvement is relatively limited.…”