Miniaturised UWB antenna with dual‐band rejection of WLAN/WiMAX using slitted EBG structure

Abstract

This study presents a new slitted electromagnetic bandgap (EBG) structure to filter undesired wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) bands in the ultra‐wideband (UWB) spectrum. A simple UWB antenna which consists of a microstrip tapered feed line, a circular patch and a defected ground structure is used as a reference antenna. The antenna is then integrated with a slitted EBG structure near the feed line to notch two interfering bands. The created notched bands by the EBG structure can be independently controlled. Owing to structural symmetry of the proposed antenna, the size can be reduced by approximately half to form a miniaturised antenna. The miniaturised antenna has the same full‐size antenna characteristics with little change in the notched bands specifications. Frequency domain measurement results show that the full‐size and miniaturised antennas have a flat transfer function, and a group delay variation of about 0.5 ns in the entire UWB band except for the notched bands.

Upper Wlan Band Notched Uwb Monopole Antenna Using Compact Two via Slot Electromagnetic Band Gap Structure

“…Recently, many authors have proposed the use of EBG structures near the feed line of the monopole antenna to reject the interfering bands in the UWB spectrum with minimal effect on the radiation properties of the antenna [16][17][18][19][20][21][22][23][24][25]. In [16], four CMT EBG structures are placed near the feed line of circular-shaped UWB monopole antenna to obtain band notch at the center frequency of 5.5 GHz.…”

Antennas for UWB Applications

“…One popular commercial application is the wireless USB (WUSB) which is designed to achieve 480 Mbit/s at distances up to 3 m and 110 Mbit/s at up to 10 m. PAN communications involve mobile handheld devices, in which case the used antennas should preferably have omnidirectional patterns with compact size and planar designs [1,2]. Considering that UWB spectrum is shared with other technologies and standards such as the 3.6 GHz IEEE 802.11y wireless local area networks (WLAN) (3.6575-3.69 GHz), 4.9 GHz public safety WLAN (4.94-4.99 GHz), and 5 GHz IEEE 802.11a/h/j/n WLAN (5.15-5.35, 5.25-5.35, 5.47-5.725, 5.725-5.825 GHz), all operating within the Federal Communication Commission (FCC) designated UWB band, of 3.1-10.6 GHz, the design of reconfigurable notch-band antennas has attracted a lot of attention [3][4][5] since they can potentially filter out the unwanted interferer.…”

Compact Uwb Antenna With Tunable Band-Notch Characteristics Using Varactor Diode

“…To avoid such potential interferences from these unwanted narrowband signals, band rejection features are required. In recent years, various design methods of UWB antenna with band-notch characteristic have been investigated [8][9][10][11][12][13][14][15][16][17]. Some conventional approaches carve differently shaped slots on radiating patches and adding stubs [8,9], insertion of resonator structures such as split ring resonator (SRR), CSRR, and electric ring resonator (ERR) [10][11][12], using parasitic strips [13] and Electromagnetic Band Gap Structures (EBG) [14][15][16][17].…”

“…However, UWB antenna's band-notched frequency [8][9][10][11][12][13][14][15][16][17] needs to be controlled and should be tunable to avoid fabrication errors and to meet the real-time reconfigurability. Thus, the reconfigurable technique has received considerable attention in wireless communications field.…”