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A novel dual-band design of planar monopole antenna is presented in this paper. Printed on a dielectric substrate and fed by a 50 Ω microstrip line, a planar monopole antenna is demonstrated to generate two separate resonant modes to cover 2.4/5.2 GHz WLAN (wireless local area network) bands with satisfactory radiation properties. The impedance bandwidths of the proposed antenna are 600 MHz centered at 2.65Hz and 1.15GHz centered at 5.12 GHz for S11 < -10 dB. The parameters which affect the performance of the antenna in terms of its frequency domain characteristics are investigated. [ABSTRACT FROM AUTHOR]

This paper presents a novel microstrip patch antenna for three-frequency and broad-band application, consisting of a 120 degree isosceles triangle with five stubs which are loaded at the bottom edge of the triangle. By adjusting lengths of these stubs, the antenna's operating frequency ratios can be tuned, and the three frequencies have the similar broadside radiation characteristics. Moreover, it is found that two separate resonate frequencies can be connected to increase bandwidth of the proposed antenna. [ABSTRACT FROM AUTHOR]

A coplanar waveguide-fed uniplanar multi-folded slot antenna that has impedance bandwidth enough to cover UWB systems is presented. The -10 dB return loss bandwidth of the antenna spans from about 3 GHz to about 11 GHz. Parametric study is presented. Details of the proposed ultra-wideband design are described and simulation results are presented and discussed in this paper. [ABSTRACT FROM AUTHOR]

Novel dual-band and broad-band designs of a slot antenna with a cross-shaped stub are presented in this paper. For dual-band operation, the antenna's operating frequency ratio can be tuned by adjusting size of the cross-shaped stub. When proper design is achieved, the antenna can generate two separate resonant modes to cover 2.4/5.2 GHz (wireless local area network) WLAN bands. The simulated impedance bandwidths of the proposed antenna are 260 MHz centered at 2.44 GHz and 610 MHz centered at 5.36 GHz for S11 < -10 dB. Furthermore, it is found that two separate resonate frequencies can be connected to cover the frequency ranges of the digital communication system, personal communication system, international mobile telecommunication, and 2.4GHz WLAN. The bandwidth of the wideband antenna is 1.49 GHz centered at 2 GHz. Details of the proposed dual-frequency and broad-band designs are described and simulation results are presented and discussed in this paper. [ABSTRACT FROM AUTHOR]