Band-notched UWB printed antenna with an inverted-L-slotted ground (original) (raw)
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Abstractņ A planar ultra-wideband antenna with dual band-notched characteristics is proposed. The main features of the proposed antenna are the extremely compact dimensions and band-notched characteristics that are obtained without modifying the radiator. The dual band-notched characteristics are achieved by a pair of mirror U-shaped slots and an inverted U-shaped slot at the conductorbacked plane. The measured results of the manufactured (15 mm × 15 mm) antenna on 1.6 mm FR4 substrate show that the antenna operates with VSWR less than two over the frequency band from 3 GHz to 11.2 GHz. That wideband is featured by the existence of two notched bands VSWR is more than five aimed at suppressing any interference from IEEE802.11a WLAN 5 GHz (5.15 GHz -5.825 GHz) and ITU 8 GHz (8.025 GHz -8.4 GHz) band. The antenna has a desirable VSWR level, radiation pattern, and gain characteristics for ultra wideband frequency band range.
Progress In Electromagnetics Research M, 2017
An octagonal shape monopole antenna with dual band-notched features used for ultra-wide band applications is presented. The monopole antenna has good impedance matching from 3.4 GHz to 12 GHz. The dual notched bands are achieved by using a U-shaped parasitic strip and meandered slot etched in the radiating patch. The first band notched is achieved using meandered slot to reduce the interference with WIMAX from 3.3 to 3.9 GHz. The second band notched is achieved using a U-shaped parasitic strip placed above the ground plane to eliminate the interference with WLAN from 5.2 GHz to 5.9 GHz. The proposed antenna is designed, simulated and measured. The measured result shows that the antenna structure achieves (VSWR < 2) from 3.2 to 10.8 GHz. Also, the simulated radiation pattern and current distribution at different frequencies are presented. The measured and simulated results confirm that the proposed antenna is suitable for UWB applications. 1. INTRODUCTION The Federal Communications Commission (FCC) approved rules for the commercial operation of ultrawide band (UWB) within the range of 3.1 GHz to 10.6 GHz [1], and as a result, the design and implementation of UWB systems have attracted much attention for communication systems. The UWB communication systems have several advantages such as enabling high data rates, increased communication security, low power consumption and simple hardware configuration in practical applications [2]. UWB antennas have to meet many requirements such as small size, omnidirectional radiation patterns, high and stable gain across the whole band, and they can be made compatible to RF components [3-8]. The Wireless LAN applications (5 GHz-6 GHz) and WiMAX applications (3.3 GHz-3.9 GHz) technologies occupy small portions of the UWB band, which introduce interference between them. In order to eliminate this interference, the antenna is designed to have band-notched features. Researchers have proposed several techniques to design band-notched antennas [9-17]. In this paper, a UWB antenna with dual band-notched characteristics is presented. First, a UWB antenna is designed, which exhibits radiating characteristics in the frequency band 3.4 GHz-12 GHz. Second, a U-shaped parasitic strip and meandered slot are used to achieve the band-notched characteristics. The first notch is achieved at frequency band (3.3 GHz-4.1 GHz). The second notch is achieved at frequency band (5.1 GHz-6 GHz). The detailed design of the antenna is introduced. The commercial software CST microwave studio was employed in the full wave simulations. 2. UWB ANTENNA CONFIGURATION The configuration of the UWB octagonal monopole antenna is illustrated in Fig. 1. The radiating element is designed in the form of octagonal shape, and the antenna is fed using 50 Ω microstrip line.
2013 30th National Radio Science Conference (NRSC)
A novel proximity-fed UWB printed annular slot antenna with dual frequency band-notched performance is presented. By attaching a parasitic arc-strip to the microstrip feed line and etching an arc-slot in the ground plane of the antenna, dual frequency band-notched characteristics are achieved. Details of the antenna design are given. The proposed antenna is simulated, fabricated and measured. The proposed antenna has an impedance bandwidth of 2.94-9.02 GHz for VSWR≤2, with dual frequency band-notched at 3.30-4.21 GHz and 4.93-6.01 GHz which reserved for IEEE 802.16 and IEEE 802.11a standard applications. The antenna shows good impedance matching, stable gain, high radiation efficiency and nearly omnidirectional radiation patterns over the entire operated UWB frequency band excluding the two rejected bands. The input admittance of the proposed antenna is modelled as SPICE-compatible equivalent circuit using Vector Fitting technique to get an electrical circuit model of the antenna. High accuracy results are obtained and the validity of the modelling method is verified.
Progress In Electromagnetics Research B, 2013
A design and analysis of a novel proximity-fed printed slot antenna with 3.5/5.5 GHz dual band-notched characteristics are presented. To obtain an ultra-wideband (UWB) response, a circular patch with a rectangular conjunction arm is etched concentrically inside a ground plane aperture. The antenna is proximity-fed by a microstrip line with an open shunt stub on the other side of the substrate. The designed antenna satisfies a −10 dB return loss requirement in the frequency band from 2.7 to 17 GHz. In order to obtain dual band-notched properties at 3.5 and 5.5 GHz, an open ring slot is etched off the circular patch and a π-shaped slot is etched off the microstrip feeding line, respectively. A curve fitting formulation is obtained to describe the influences of the notched resonators on the corresponding notched frequencies. The proposed antenna is designed, simulated and fabricated. The measured data show a good agreement with the simulated results and the equivalent circuit results through the use of a modified Vector Fitting technique for a rational function approximation. The proposed antenna provides almost omnidirectional radiation patterns, relatively flat gain and high radiation efficiency over the entire UWB frequency excluding the two rejected bands.
A Planar UWB Monopole Antenna with On-Ground Slot Band-Notch Performance
2013
─ A planar monopole antenna with variable frequency band-notch characteristic for ultra wideband applications is presented. The proposed antenna consists of a truncated ground plane and a radiating rectangular patch. By employing two L-shaped strips on the top edge of the ground plane, the ultra wideband property is achieved. Electromagnetic interference (EMI) from IEEE 802.11a can be avoided for a wideband antenna with a stop-band. For a notched frequency band, two L-shaped slits are embedded on the ground plane. The designed antenna has a stopband of 5 GHz to 5.9 GHz while maintaining wideband performance from 3.1 GHz to 10.6 GHz for VSWR < 2. Index Terms ─ Band-notched, slot, slit, and ultra wideband.
Proceedings of INDICON 2009 - An IEEE India Council Conference, 2009
Planar ultrawideband (UWB) antenna with an Eshaped slot for a 5/6 GHz band notched characteristics is presented. The antenna is a planar structure and has a compact area of 25x25 mm 2 , which covers the frequency band from 3.1 GHz to 10.6 GHz (2 VSWR ≤). The antenna has a circular slot cut in the ground plane and a circular patch is printed within that. A 50-coplanar waveguide (CPW) transmission line is used to feed the printed circular metal patch. By removing an Eshaped slot from the circular patch, band rejected property in the WLAN band is obtained. The compact antenna has the promising performance including broadband impedance matching, consistent radiation pattern and stable gain.
STUDY OF ELLPITICAL SLOT UWB ANTENNAS WITH A 5.0--6.0 GHz BAND-NOTCH CAPABILITY
Progress In Electromagnetics Research C, 2010
Two microstrip fed ultra-wideband (UWB) antennas with different band rejection techniques are presented in this paper. The designed antennas consist of a defected ground plane with an elliptical slot and two different radiator shapes. The first design is composed of a half circular ring radiator element while the second one uses a crescent shaped radiator. The radiators are fed by a 50 Ω microstrip line with a tapered microstrip transition to ensure good impedance matching. The calculated impedance bandwidth of the proposed antenna ranges from 3 GHz to 14 GHz with relatively stable radiation patterns. To achieve band-notch characteristic in the 5.0-6.0 GHz WLAN frequency band, two different techniques have been implemented. The first technique uses a C-shaped slot etched in the ground plane while the other one uses another C-shaped slot in the feed line.
Design and Analysis of Compact UWB Antenna with Band Notch Characteristics
2017
Small, printed rectangular slot antenna for ultra-wideband (UWB) applications is proposed in this article. In this proposed antenna, inverted T-shaped conductor backed plane used to achieve the UWB coverage by increasing the impedance bandwidth of the rectangular slot antenna. Then frequency band notched performance can be achieved by using rotated C-shaped conductor backed plane around the inverted T-shaped conductor backed plane. Then band width can be controlled by etching inverted T-shape in the square radiating patch on the top layer. The proposed antenna has a very small size which is 21 mm x 26.8 mm. The antenna has VSWR < 2 for the UWB from 3.0811 to 10.737 GHz except for the band notch from 5.1429 to 5.9523 GHz for this VSWR > 5. Keywords T-shaped conductor backed plane, rectangular slot antenna, rotated C-shaped conductor-backed plane, UWB application, SMA, FR4. INTRODUCTION In UWB communication systems, the design of antenna having wideband characteristics and compa...