A new planar monopole antenna that covers 3G, Bluetooth, WiMAX, and the UWB bands but exhibits dual band-notched characteristic is presented. By etching one quasi-complementary split-ring resonator (CSRR) in the feed line, dual notched frequency bands centered at 5.3 and 7.4 GHz are obtained. To achieve the lower resonance over the 3G band, the transmission-line-based metamaterial (TL-MTM) loading is employed to gain the benefit that the radiation pattern is orthogonal to other resonance modes. The proposed antenna has been successfully simulated and measured. Experimental results indicate that the proposed antenna yields an impedance bandwidth of 2-12.5 GHz with VSWR<; 2, except the dual notched bands of 5.0-5.5 and 7.2-7.6 GHz. Furthermore, good group delay and transmission characteristics can be achieved in the UWB band.

Planar Antenna for 3G/Bluetooth/WiMAX and UWB Applications With Dual Band-Notched Characteristics

In this paper, a new compact circular monopole ultra- wideband antenna with multiple narrow bands notched is proposed, which is implemented by using the existing techniques, such as loading a L-type band-stop filter, inserting a split ring resonator (SRR), and the method we proposed that connecting L branches on the radiation disk Four sharp notches at 24GHz, 35 GHz, 55 GHz, and 76 GHz are achieved separately The measured VSWR shows a good agreement with the simulation results The radiation patterns are obtained from Ansoft HFSS simulations and verified by CST Microwave Studio The results prove that this kind of antenna can be applied in the UWB communication systems to avoid interference with other wireless systems, such as the 24GHz WLAN, 35 GHz WiMax, and 58 GHz WLAN etc The parameters determining the antenna's band notched characteristic are discussed

https://www.jpier.org/PIER/pier84/19.08072801.pdf

A Compact Ultra-Wideband Microstrip Antenna with Multiple Notches

A compact dual band-notched ultra-wideband slot antenna with sharp band-notched characteristics and controllable notched bandwidths is presented. The antenna is formed by a rectangular slot with chamfered corners on a printed circuit board ground plane, a T-shaped stub and two sets of compound band- notched structures. The compound band-notched structures are employed to generate desired lower and upper rejected bands with satisfactory skirt characteristics and su-cient rejection bandwidths. Moreover, the bandwidth of either the lower or upper rejected band can be independently adjusted by changing the size and location of the corresponding band-notched structure. Finally, a UWB slot antenna with two rejected bands at WiMAX/WLAN frequencies is successfully simulated, designed, and measured, showing good impedance matching, stable gain and near omnidirectional radiation patterns.

/pdf/improved-dual-band-notched-uwb-slot-antenna-with-3dw7ow2y6r.pdf

Improved Dual Band-Notched UWB Slot Antenna with Controllable Notched Bandwidths

In this paper the maximum sidelobe level (SLL) reductions without and with central element feeding in various designs of three-ring concentric circular antenna arrays (CCAA) are examined using a real-coded Evolutionary Programming (EP) to finally determine the global optimal three-ring CCAA design. Standard real-coded Particle Swarm Optimization (PSO) and real-coded Particle Swarm Optimization with Constriction Factor and Inertia Weight Approach (PSOCFIWA) are also employed for comparative optimization but both prove to be suboptimal. This paper assumes non-uniform excitation weights and uniform spacing of excitation elements in each three-ring CCAA design. Among the various CCAA designs, the design containing central element and 4, 6 and 8 elements in three successive concentric rings proves to be such global optimal design set with global minimum SLL (−39.66 dB) as determined by Evolutionary Programming.

Design of Concentric Circular Antenna Array with Central Element Feeding Using Particle Swarm Optimization with Constriction Factor and Inertia Weight Approach and Evolutionary Programing Technique

Since the release by the Federal Communications Commission (FCC) of a bandwidth of 7.5GHz (from 3.1GHz to 10.6GHz) for ultra wideband (UWB) wireless communications, UWB is rapidly advancing as a high data rate wireless communication technology. As is the case in conventional wireless communication systems, an antenna also plays a very crucial role in UWB systems. However, there are more challenges in designing a UWB antenna than a narrow band one. A suitable UWB antenna should be capable of operating over an ultra wide bandwidth as allocated by the FCC. At the same time, satisfactory radiation properties over the entire frequency range are also necessary. This paper focuses on UWB planar printed circuit board (PCB) antenna design and analysis. Studies have been undertaken covering the areas of UWB fundamentals and antenna theory. Extensive investigations were also carried out on the development of UWB antennas from the past to present. First, the planar PCB antenna designs for UWB system is introduced and described. Next, the special design considerations for UWB antennas are summarized. State-of-the-art UWB antennas are also reviewed. Finally, a new concept for the design of a UWB antenna with a bandwidth ranging from 2GHz-11.3GHz is introduced, which satisfies the system requirements for S-DMB, WiBro, WLAN, CMMB and the entire UWB . KeywordsUltra wideband, planar PCB Antenna and bandwidth.

/pdf/ultra-wideband-antennas-past-and-present-354vzxme2g.pdf

Ultra wideband antennas: past and present

This paper presents a novel band-notched elliptical slot antenna for Ultra Wide-Band (UWB) communication, which is printed on a dielectric substrate of RT/duroid 6006 with relative permittivity (er) of 6.0, thickness of 1.27 mm, and fed by an elliptical open ended microstrip line connected to the 50 Ω main line. This antenna is designed to be used in frequency band of 3.1–10.6 GHz. Bandnotched characteristics of antenna to reject the frequency band of 5.15–5.825GHz, which is limited by IEEE 802.11a, is realized by parasitic inverted-U strip attached to the elliptical slot plane. Effects of varying the parameters of parasitic inverted-U strip on performance of proposed antenna have been investigated. The antenna with optimal parameters obtained from parametric study is fabricated and measured. It is observed that the simulation and experimental results have good agreements with each other. 128 Fallahi, Kalteh, and Golparvar Roozbahani

/pdf/a-novel-uwb-elliptical-slot-antenna-with-band-notched-330t5wtcys.pdf

A novel uwb elliptical slot antenna with band-notched characteristics

The suitable use of an array antenna at the base station of a wireless communication system can result in improvement in signalto-interference ratio (SIR). In the present work, we consider circular array (CA) and concentric circular antenna array (CCAA) that are used for smart antenna systems. The performance criteria for SIR improvement is employed in this paper, is the spatial interference suppression coefficient. We first develop the expression of this figure of merit for CCAA and then analyze and compare the SIR performance for various configurations of eight and nine elements of CA and CCAA, with and without the element in the center by using circular patch antenna are provided. In addition, the effect of mutual coupling (MC) is taken into account.

/pdf/effect-of-mutual-coupling-and-configuration-of-concentric-3651066b3e.pdf

Effect of Mutual Coupling and Configuration of Concentric Circular Array Antenna on the Signal-to-Interference Performance in CDMA Systems

In this paper, a novel band-notched circular slot (BNCS) antenna for ultra-wideband (UWB) communication is proposed. This antenna is comprised of a circular stub that excite similar-shaped slot aperture. The proposed antenna is designed on the RO4350B substrate with thickness of 500"m and relative permittivity ("r) of 3.4 to operate in UWB band released by the US's Federal Communications Commission (FCC) in 2002 (i.e., 3.1{10.6GHz). To reject the frequency band of 5.15{5.825GHz, which is limited by IEEE 802.11a and HIPERLAN/2, an inverted-cup strip is parasitically attached to the feed layer. The size of our proposed antenna is 50 £ 50mm 2 , and this antenna has good radiation characteristics. Efiects of varying the parameters of parasitic inverted-cup strip on performance of the proposed antenna have been studied. The antenna with optimal parameters obtained from parametric study is fabricated and measured. It is observed that the simulated and experimental results have good agreement with each other.

https://www.jpier.org/pierc/pierc12/10.09123007.pdf

Design of a Band-Notched Microstrip Circular Slot Antenna for UWB Communication

In this paper, a new notch frequency circular slot antenna is proposed for ultra wide-band (UWB) applications. Antenna is printed on a dielectric substrate of RO4350B with relative permittivity (epsivr) of 3.4 and thickness of 500 mum. Antenna is fed by a circular open ended microstrip line is connected to a 50 Omega main line. This antenna is designed to use in UWB band released by FCC in 2002 (3.1-10.6 GHz). Band notched characteristics to reject the frequency band of 5.15-5.825 GHz which is limited by IEEE 802.11a are realized by parasitically attaching inverted-cup strip to the slot plane. Effects of varying the parameters of parasitic strip on the performance of antenna have been investigated.

A novel microstrip-fed UWB circular slot antenna with 5-GHz band-notch characteristics

In this paper a novel band-notched elliptical slot antenna for ultra-wideband (UWB) communication is proposed which is comprised of elliptical stub that excite similar-shaped slot aperture. The proposed antenna is designed on a substrate RT/duroid 6006 with thickness of 1.27 mm and relative permittivity (er) of 6.0 to operate in UWB band released by FCC in 2002 (i.e., 3.1–10.6 GHz). To reject the frequency band of 5.15–5.825 GHz, which is limited by IEEE 802.11a and HIPERLAN/2, an inverted-U-shaped strip is parasitically attached to the feed layer. The size of our proposed antenna is 45×50 mm2, which results in desirable radiation characteristics. Effects of varying the parameters of parasitic inverted-U strip on performance of proposed antenna have been studied. The antenna with optimal parameters obtained from parametric study is fabricated and measured. It is observed that the simulation and experimental results have good agreements with each other.

Rajab Fallahi

Papers

A novel uwb elliptical slot antenna with band-notched characteristics

Effect of Mutual Coupling and Configuration of Concentric Circular Array Antenna on the Signal-to-Interference Performance in CDMA Systems

Design of a Band-Notched Microstrip Circular Slot Antenna for UWB Communication

A novel microstrip-fed UWB circular slot antenna with 5-GHz band-notch characteristics

5-GHz band-notched UWB elliptical slot antenna fed by microstrip line