Design of Reconfigurable Monopole Antenna With Switchable Dual Band-Notches for Uwb Applications

Abstract

A reconfigurable antenna with on-demand single-band or dual-band rejection capability for ultra-wideband (UWB) applications is presented. A modified monopole structure is integrated with a U-shaped slot and an open-ended slot to realize band-rejection. The antenna operates in four modes: a full UWB (3.1-10.6 GHz) coverage antenna, a UWB antenna with a single-band WiMax or wide local area network (WLAN) rejection, and a UWB antenna with dual-band WiMax/WLAN rejection. On-demand single and dual-band rejections are implemented by controlling two slots using two PIN diodes. Thus, the adopted control technique is quite easy and requires low operating power. Details of the design process and reconfiguration mechanism are presented. The band-rejection performance is explained by return loss and surface current distribution at single-band mode. A prototype is built on a Rogers substrate and tested to validate the performances. The antenna exhibits stable radiation characteristics and almost flat gain responses across the whole band, while significantly gain reduction is achieved at the rejected bands. Therefore, this antenna is suitable for high-performance UWB systems in WiMax/WLAN dense environments with the aim to improve signal quality, system capacity, and communication efficiency.

A compact flower slotted dual band notched ultrawideband antenna integrated with Ku band for ultrawideband, medical, direct broadcast service, and fixed satellite service applications

“…For the proposed FSA, the realized gain is −2.10 dBi at 5.6 GHz and -1.91 dBi at 7.4 GHz represents the antenna eliminates WLAN and X-band signals. Moreover, the gain varies from 2.21 to 3.55 dBi, except at notched bands over operating frequencies of FSA represents the proposed FSA gain is more stable than the reported antennas [22][23][24][25][26][27][28][29][30][31][32][33][34] in Table 3.…”

Twelfth mode on-demand band notch UWB antenna for underlay cognitive radio

“…Merits like low power consumption, wide impedance bandwidth, constant gain, jamming immunity and higher capacity [1] combined with the wide range of applications including imaging systems, target localization and automotive applications [2], [3] lead ultra-wideband (UWB) systems to pick an increasing interest in the world of wireless communications since its declaration by Federal Communications Commission (FCC) in 2002 [4]. Unfortunately, many wireless technologies are coexist within the range 3.1-10.6 GHz that is allocated for UWB.…”

“…This depends on the ON/OFF state of the PIN diode within the U-shape slot in the feed line of [1] and the triangular-shape slot in the patch of [13]. Two PIN diodes are used in [2] and [14] to configure the antenna in an UWB mode or WiMax/WLAN rejection modes. These two diodes are used across the feed-line U-shape and line-shape slit of the patch in [2], while they link the L-shape radiator stub and L-shape ground slit in [14].…”

“…Two PIN diodes are used in [2] and [14] to configure the antenna in an UWB mode or WiMax/WLAN rejection modes. These two diodes are used across the feed-line U-shape and line-shape slit of the patch in [2], while they link the L-shape radiator stub and L-shape ground slit in [14].…”