Triple band‐notched UWB antenna based on SIR‐DGS and fork‐shaped stubs

Abstract

A compact CPW-fed triple band-notched antenna for ultra-wide bandwidth (UWB) application is presented. By introducing an stepped impedance resonator-defected ground structure (SIR-DGS) and fork-shaped stubs, three sharp notches are achieved at frequencies of 3.5, 5.68 and 7.48 GHz. The proposed antenna working from 2.8 to 11.3 GHz with a voltage standing wave ratio of <2 is demonstrated, except for the selected notched bands. The main advantage of the antenna is that the frequency of the notched band can be tuned easily in a wide frequency range. A good agreement between the measurement and the simulation was achieved. The measurements confirm that the technique introduces negligible antenna radiation pattern distortion, except at the triple-notched frequencies. Introduction: The Federal Communication Commission announced permitting of 3.1-10.6 GHz for ultra-wide bandwidth (UWB) applications in 2002. Antennas, as a key component of the UWB system, have been widely investigated by many researchers. However, antenna designs still face many challenges, including impedance matching, radiation patterns and so on. On the other hand, in the designated band for UWB systems, there exist several relatively narrow frequency bands used by other wireless systems such as worldwide interoperability for microwave access (WiMAX) operating at 3.3-3.7 GHz, C-band satellite communication systems operating at 3.7-4.2 GHz, IEEE 802.11a/n operating at 5.15-5.825 GHz, the downlink of X-band satellite communication systems operating at 7.25-7.75 GHz and the Earth Exploration Satellite Service (EESS) operating at 8.025-8.4 GHz. To avoid interference, various UWB antennas with one or multiple bandnotched characteristics have recently been developed [1-5]. Nevertheless, many band-notched antenna designs in the literature cannot adjust to suit for all avoidable interferences. In this Letter, a printed UWB antenna with three band notches is presented. By introducing the stepped impedence resonator-defected ground structure (SIR-DGS) and the fork-shaped stubs, three sharp notches are achieved. The fork-shaped stubs structure on the radiation patch achieves a dual band-notched performance for the IEEE 802.11a/n and the X-band satellite communication systems, and the SIR-DGS structure inserted in the ground plane obtains the band-notched characteristic for the WiMAX. Compared with the previous antennas in [1-5], a larger adjusted range can be obtained. The details of the antennas design and the results are discussed below.

An Electrically Small Antenna Using Defected Ground Structure for Rfid, GPS and Ieee 802.11 a/B/G/S Applications

“…The transmission line with DGS gives a higher effective impedance and also introduces high slow wave effect, which provides rejection band in some frequency range. Different shapes such as rectangular, circular, dumbbell, spiral, L-shaped, concentric ring, hairpin, square, hexagon-shaped and many more DGS structures have been proposed in the literature [18,19]. DGS structure is employed in the CPW feed for enhancing the bandwidth, and the gain of patch antenna is proposed in [20].…”

A Compact Wideband Slot Antenna for Universal Uhf Rfid Reader

“…Recently, DGS has been speedily developed within the UHF RFID system. It consists in etching a certain geometrical shape in the antenna ground plane [12]. It can be dependent on the performance desired to make the surface current distribution in the ground plane, control the propagation of the electromagnetic waves through the substrate layer and produce the slow wave effect [13,14].…”

Compact Tri-Band Notched Characteristics UWB Antenna for WiMAX, WLAN and X-Band Applications

“…The conventional methods to achieve band-notched function are by etching different shapes of slots in the radiating patch or in the ground plane [9][10][11][12][13], or by using parasitic elements in the aperture area of the antenna [14,15] or by embedding a slit in the feed line that leads to a sudden change in the impedance in the notched band [16,17]. An ultra-wide band antenna with dual band-notched characteristics with an impedance bandwidth from 2 to 13.7 GHz and 50×40 mm 2 size, and U-shaped defected patch structure as well as ∏-shaped defected patch structure are applied to obtain a dual band-notched characteristics covering WiFi and WiMAX, are presented in [18].…”