Band-notched Planar Monopole Antenna Research Articles

Design and analysis of a compact WiMAX and WLAN band notched planar monopole antenna for UWB and bluetooth applications

In this manuscript, a compact UWB with dual band-notched planar monopole antenna is investigated. The band notched characteristics at WiMAX and WLAN is obtained by connecting two pairs of stubs to the modified ground plane. The size of proposed antenna is 25(W) × 30(L) × 1.6(H) mm3 which consists of a fork shaped structure as a main radiating element and excited with a 50-Ω microstrip line. The proposed antenna covers Bluetooth frequency band (2.4-2.48 GHz) along with UWB spectrum without increasing the size of the antenna. The measured operating frequency of the proposed antenna is from 2.4 to 12.8 GHz along with WiMAX and WLAN band-notched. Moreover, the measured gain of the proposed antenna varies between 2 and 6 dBi except notched band. At notched frequencies, it is −1 and −6 dBi at WiMAX and WLAN, respectively. The total antenna efficiency varies from 80% to 95% except notched frequency bands. The radiation patterns and time domain characteristics are also analyzed and found suitable for the modern UWB applications. Finally, a prototype of dual band-notched antenna is manufactured and its characteristics are measured using network analyzer. The simulated and measured results are found in close agreement.

A Novel Band-Notched Planar Monopole Antenna for Ultrawideband Applications

In this letter, a novel planar monopole antenna with a variable frequency band-notch characteristic for ultrawideband (UWB) applications is presented. The UWB property is achieved by embedding two shorted rectangular quarter-wavelength resonators. Two other L-shaped quarter-wavelength resonators coupled to the radiating patch are also used in order to generate the frequency band-stop performance and control antenna characteristics such as band-notch frequency and its bandwidth. The designed antenna has a stopband of 5-5.9 GHz while maintaining wideband performance from 3.1 to 11 GHz with VSWR <; 2.

A Compact Band-Notched Planar Monopole Antenna from 3 to 24 GHz

A compact ultra-wideband (UWB) microstrip-fed planar monopole antenna with the band-notched characteristic is presented. This antenna comprises an annular-shape radiating element and a tuning stub which is inserted into the annular structure to obtain the band-notched characteristic. The notch frequency can be easily adjusted from 5 to 6.3 GHz by tuning the length of the stub. The VSWR characteristic from (3–24 GHz) and quasi omni-directional radiation pattern is observed. The proposed antenna is suitable for all UWB communication applications and prevents interference with the WLAN systems.

Design of a Band-Notched Planar Monopole Antenna Using Genetic Algorithm Optimization

Genetic algorithm (GA) optimization is applied to the design of planar monopole antennas, which exhibit both ultrawideband (UWB) operation and a narrow-band frequency notch. Such an antenna is useful in applications involving wideband communications where it is desired to mitigate interference with other radio systems colocated with the operating band. It is demonstrated in this paper that traditional band-notched planar monopole antennas exhibit asymmetry in radiation patterns within the notch band such that the attenuation provided by the antenna varies as a function of azimuth angle, which lowers the effective bandwidth of the notch. A GA optimizer, which uses of a weighted sum cost function related to impedance matching and radiation patterns at frequencies within both the wide operating band and narrow notch band, is used to improve the performance of the band-notch planar monopole antenna. A two-dimensional (2-D) matrix chromosome is used in the GA to represent a wide-range on planar element shapes. It is shown that the GA generates antenna designs that exhibit equal wideband performance as traditional band-notched designs, but have improved azimuth plane radiation pattern symmetry, which widens the effective notch bandwidth. The GA-generated antenna design is measured and compared with simulation

Novel Planar Monopole UWB Antenna with 5-GHz Band-Notched Characteristic

This paper presents a novel band-notched planar monopole antenna with a compact size of 25×20×1.6 mm3 for ultra-wideband (UWB) applications. The proposed antenna is composed of an asymmetric annular-ring patch and an stair-style ground plane. An inverted-T structure is employed to realize a band rejection. It is demonstrated to provide a wide bandwidth (VSWR<2) from 2.8 GHz to 11.6 GHz including a 5-GHz band-notched characteristic with satisfactory omni-directional radiation patterns. Good agreement has been obtained between the simulated and experimental results.

Multiple band-notched planar monopole antenna for multiband wireless systems

A multiple band-notched planar monopole antenna for multiband wireless systems is presented. The proposed antenna consists of a wideband planar monopole antenna and the multiple U-shape slots, producing band-notched characteristics. In order to generate two band-notched characteristics, we propose that three U-shape slots are required. This technique is suitable for creating ultra-wideband (UWB) antenna with narrow frequency notches or for creating multiband antennas.