A compact circular‐ring antenna for ultra‐wideband applications

Abstract

destructive technique. It also requires a physical contact with the detected material, which is not always possible. On the other hand, this MIBS system is much simpler, smaller, and cheaper than any LIBS system, because it utilizes low-cost microwave components and could be realized as a portable tool. Yet, the microwave-drill-based MIBS technique is not considered as a substitute for the LIBS technology but more likely as a low-cost extension for specific field applications.The MIBS analyses and identification, demonstrated here by a simple algorithm, could be performed as well by various commercial programs with larger databases and more sophisticated algorithms available for LIBS systems. Such a program (e.g., AvaLIBS-Specline-A or similar) could be incorporated in the MIBS system to include additional elements.Besides technical improvements (like extension toward IR and UV spectral ranges, increasing the sampling rate, and improving optical resolution and sensitivity), the localized microwave-based AES could be incorporated with additional spectroscopic methods such as atomic absorption spectroscopy and atomic florescence spectroscopy in order to verify the identification of the elements in the detected bulk material. Similar microwave excitation concepts might be considered also for the detection of larger molecules and even chemical or biological agents. REFERENCES1.

Design, Investigation and Measurement of A Compact Ultra Wideband Antenna for Portable Applications

“…The total dimension of the UWB antenna is optimized to a compact size of 20 × 24.5 mm 2 , which is smaller than other existing antennas of the literature [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][38][39][40][41][42] and is suitable for the applications in portable devices. In order to achieve the wideband operations and performance investigation of the proposed antenna configurations a fullwave, method-of-moment (MoM) code based commercially available electromagnetic simulator Zeland IE3D version 12 is used.…”

“…Some asymmetric CPW-fed UWB antennas can also be found in reported literatures [31][32][33][34], but they are either of complex structure or of big shape for portable device applications. The printed structures described in [38][39][40][41][42] provides ultra wide bandwidth with some advanced techniques, however, fails provide competitively compact size. …”

Design of a wideband planar antenna on an epoxy-resin-reinforced woven-glass material

“…The value of the width and length of the transmission line is set at 2.75 mm and 6 mm, respectively, so that the input impedance of the feeding of the antenna becomes equivalent to 50 W. A copper cladding 35 μm is used to metalise the patch, feed line and the ground plane of the proposed antenna. The overall dimension of the designed wideband antenna is optimized to a compact size of 29 mm × 20.5 mm, which is much smaller than the antennas proposed in 9,[12][13][14] and very suitable to be integrated into portable communication devices.…”

A Circular-Ring Monopole Antenna with a Half-Circular Ring and Ground Slot for WLAN/WiMAX Triple-Band Operations

“…This proposed antenna is made of expensive materials, unlike the conventional FR4 materials. The circular-ring, printed monopole antenna [13], the M-shaped antenna surrounded by a ring monopole [14] for wideband operations, the band-notched circular-ring monopole antenna [15][16][17], the CPW dual-ring loop antenna for dual-band operation [18], the ring monopole UWB antenna with a band notch [19] and the compact-ring monopole antenna for Wi-BAN [20], and the CPW-fed circular-ring monopole with an inverted T-strip line for dual-band operation [21] have already been proposed. In this study, a novel microstrip-fed monopole antenna for WLAN and WiMAX band applications was designed.…”

“…Among printed monopole antennas, the circular-ring monopole antenna [5][6][7][13][14][15][16][17][18][19][20][21], the ring monopole antenna with double-coupled C-shaped strips [5], the dual-band ringshaped antenna [6], and the ring monopole antenna with a defected ground plane [7] for WiMAX/WLAN application have been studied. In particular, the double-coupled C-shaped strips [5] antenna is designed and fabricated at a substrate with a relative permittivity of 2.65.…”