A planar monopole UWB antennas with rounded patch and ground plane possessing improved impedance matching

Abstract

A planar monopole UWB antenna with rounded patch and rounded truncated ground plane for ultra-wideband applications is investigated. The geometry of the antenna is optimized to obtain a minimum return loss. The antenna provides the return loss better than À15 dB in almost the entire (3.1-10.6) GHz frequency band and good radiation characteristics. The simulated and experimental results are in a good agreement.

Design and fabrication of ultra wide-band antenna with band notching property using t-shaped defected ground structure

“…Varying feed techniques/structures like double feed [6], trident feed [7], meandering feed [8], T shaped stub [9], 3 offset stub [10], fan shaped stub antenna [11] have also been tried in past to enhance the antenna bandwidth. Antenna band width enhancement have also been reported in literature by the variation in ground plane shape like notched ground [12], saw tooth ground [13], rounded CPW ground [14], tapered CPW ground [15], coaxial line [16] etc.…”

“…But there is a probability that UWB user in WiMax, WLAN environment may be effected [17] with high signal transmission level of WLAN/WiMax. In efforts to reduce the interference from narrow band systems [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] meandered ground stubs have been used [18][19] to notch single, dual-band or Triple band. Further, by making slots in ground, bands from 3.3 to 3.7GHz, 3.7 to 4.2 GHz and 5.2 to 5.8 GHz have been notched to overcome electromagnetic interference [20], but they suffers from gain uniformity, impedance bandwidth etc.…”

Wideband and UWB Antennas for Wireless Applications: A Comprehensive Review

“…The need to satisfy these important requirements has given rise to a strong research activity that led to the development of a large class of antennas. In this context, of particular interest are the wideband [33][34][35][36][37][38], the multiband [39][40][41][42][43][44][45][46][47][48], and the UWB printed monopole antennas, simple [49][50][51][52][53][54][55][56][57] and with notched bands to avoid interference with other radio communication systems [58][59][60][61][62][63][64][65][66][67][68] or those suitable for supporting the circular polarization [33,[69][70][71]. A large class of geometries (rectangular, circular, elliptical, triangular, hexagonal, annular, etc.)…”

Ultra-Wideband Antenna and Design

“…The printed square monopole antenna with symmetrical saw-tooth ground plane obtains the impedance bandwidth ratio of 5.5:1 (2.9~16GHz). Considering high concentration of currents in the corners of the patch or ground, Melo et al [31] studied a rounded monopole patch with a rounded truncated ground plane. It provides an impedance bandwidth ratio of larger than 4.7:1 (2.55 ~12 GHz).…”