Ultra-Wideband Shorted Patch Antennas Fed by Folded-Patch With Multi Resonances

Abstract

Abstract-Novel designs of probe-fed broadband shorted patch antennas for ultra-wideband (UWB) applications are presented in this paper. In these designs, unequal resonance arms fed by a folded patch produce multi resonances to broaden the impedance bandwidth. In the first design, the antenna consists of an asymmetric E-shaped patch, a folded-patch feed and shorting pins. This antenna is achieved by four adjacent resonances with the measured −10 dB impedance bandwidth of 76.18%. The pins are utilized to miniaturize the size of the patch. By introducing a folded ramp-shaped feed in the similar structure with the first design, a wider bandwidth with the five resonances is obtained. This improved design introduces an antenna with an impedance bandwidth of more than 110% and a considerable size reduction compared to the first antenna. The antennas present resonance tuning ability within the impedance bandwidth by varying the length of unequal arms. In addition, parametric studies are performed by investigating the effects of different key parameters on obtaining optimal designs of the proposed antennas.

Design of a Novel Wideband Loop Antenna With Parasitic Resonators

“…The radiating patch is connected with the ground plane by a short pin and the height H approximately equals a quarter of the free space wavelength. This configuration is utilized for balanced excitation and high gains [9]. An SMA connector located underneath the ground plane is connected to the end of the coax feed-line.…”

“…The microstrip patch antenna is considered to be a typical structure to realize directional radiation pattern with low profile, but they commonly yield a narrow bandwidth. Recently, some directional wideband antennas with low profile have been investigated [7][8][9][10][11][12], such as the circular patch antenna [7] fed by a coaxial probe with a threedimensional transition structure, the L-shaped patch antenna [8] fed with Γ-shaped strip, and the antennas [9][10][11][12] fed by coaxial probes with capacitor patches. However, these antennas are very complex in structure.…”

Analysis on bandwidth enhancement of compact probe‐fed patch antenna with equivalent transmission line model

“…An asymmetric E-shaped patch with folded-patch technique provides UWB characteristics and the bandwidth is increased to 76.16% [25]. Moreover, the designs with shorted patches have been reported [26,27], which with the novel feeding technique, namely folded ramp-shaped feed produces multi resonances to expand the bandwidth to more than 110 and 130% for UWB operation. As reported in [28], compact patch antennas fed by folded ramp-shaped patch with unequal arms and centre pin are introduced for UWB applications.…”

Wide Slot Loop Antenna With Distance-Adjustable Back-Reflector for Multiple Narrowband Antennas Replacement

“…Nowadays, with the rapid development of smart and multifunctional communication systems, antennas and antenna arrays with wide frequency coverage and reliable radiation properties are demanded [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Among various kinds of antennas, the slot loop antenna (SLA) has raised research interests in academic and industrial fields for its simple configuration and good radiation properties.…”