Wide band rectangular microstrip antenna using symmetric T‐shaped feed

Abstract

give the limitation of high pump powers, all the devices present almost the same XL (around Ϫ1.5 dB).For the soliton regime, in all the devices there is a decrease of XL for pump powers around 1 W, which is the energy of the fundamental soliton. For high pump powers, all devices present a second peak, and decreased XL is detected. For the L/10 device, the minimum (Ϫ3.7 dB) is around 8 W.The increase of the pump power results in high-order solitons and pulse compression; in this situation the bandwidth of the pulse increases and we can extrapolate the bandwidth of the device as the XL increases.Our study of the XL on the AOTF, operating with ultra-short optical solitons, provides possibilities for achieving high efficiency in ultrafast all-optical signal processing, especially for optical switches, filters, and optical transistors. The AOTF has attracted much attention in recent years, in part because it appears to be a suitable basis for multiwavelength optical cross-connects. It is probably the only known tunable filter capable of selecting several wavelengths simultaneously. This capability can be used to construct a multiwavelength router. ACKNOWLEDGMENTWe thank Funcap, CNPq, CAPES, and FINEP (Brazilian Agencies) for their financial support.

Shape enhancement and size reduction of UWB printed monopole antenna

“…The antenna that is intended to accomplish the operating bandwidth required by SPR is designed to be deployed on some dielectric substrate with shape enhancement and size reduction. Originally, it is developed from a rectangular microstrip antenna fed by a symmetric T-shaped [5] with some improvement and modification. The investigations are carried out to achieve the required characteristics as well as to obtain the compactness of the design.…”

Numerical Design of Ultra-Wideband Printed Antenna for Surface Penetrating Radar Application

“…The frequency range is chosen as a tradeoff of between the resolution and the depth of penetration. The proposed antenna is developed from a rectangular microstrip antenna fed by symmetric T-shaped [6]. Some methods such as resistive-loaded, abrupt transition and ground plane modification are included in the development to achieve the required specifications [7]- [11].…”

Triangular slot antenna with a double‐T‐shaped tuning stub for wideband operation

“…Techniques to enhance the bandwidth slot antennas have been reported [7][8][9][10]. In particular, wide-slot antennas have an attractive property of providing a wide operating bandwidth, especially for those with a modified tuning stub, such as a T-shaped stub [11][12][13], a fork-type stub [14], a circular stub [15], a triangular stub [16], a rectangular stub [5,17], and a fan-shaped stub [18]. Although many microstrip-fed wide-slot antennas have been proposed for wideband application, studies on the triangular slot with a double-T-shaped tuning stub for wider bandwidth have been rare.…”

“…A few attempts have been made to increase the bandwidth of CPW-fed slot [1,2] and monopole [3][4][5][6][7][8][9][10][11][12] antennas. The bandwidth ratio is less than 4.5:1 in [1][2][3][4][5][6][7][8][9][10][11].…”

“…The bandwidth ratio is less than 4.5:1 in [1][2][3][4][5][6][7][8][9][10][11]. In [12], the antenna with a bandwidth ratio of more than 6:1 is achieved, but with a larger size.…”