Binod Kr Kanaujia

A CPW-Fed Compact UWB Microstrip Antenna

A novel coplanar waveguide (CPW)-fed compact ultrawideband (UWB) microstrip antenna is proposed for ultrawideband applications. The proposed antenna posseses a method to minimize the monopole antenna by loading of inverted L-strip over the conventional monopole patch antenna to lower the height of the antenna. The ground was vertically extended toward two sides of the single radiator. Therefore, the large space around the radiator that is usually wasted can be effectively saved. The antenna is practically fabricated and simulated. Measured results show a good agreement with simulated results. The prototype with overall size of

Circularly Polarized Arrowhead-Shape Slotted Microstrip Antenna

25 \times 25 \times 1.6\ {\hbox{mm}}^3

An inverted L-strip UWB microstrip antenna

achieves good impedance matching, constant gain, stable radiation patterns, and constant group delay over an operating bandwidth of 2.6-13.04 GHz (10.44 GHz).

Square-ring microstrip for CP Operation

A novel single-feed arrowhead-shape slotted microstrip antenna for circular polarization (CP) is proposed. To achieve CP radiation and antenna size reduction, an arrowhead-shaped slot is embedded in the first quadrant along the diagonal axes of a square patch. Thus, the structure is asymmetric, and good-quality CP performance can be achieved by adjusting the size of the slot. The antenna is simulated and practically fabricated. Measured results confirm the validity of this design and show a good agreement with simulated results. The antenna generates CP radiation at 911 MHz with an overall size of 87 × 87 × 4.572 mm 3. The fabricated antenna shows an impedance bandwidth of 35.0 MHz (888.0-923.0 MHz) with 8.0 MHz (908.0-916.0 MHz) 3-dB axial-ratio bandwidth (ARBW).

Triple-band antenna combining Minkowski and modified Sierpinski fractal geometry

A novel inverted L-strip UWB microstrip antenna is proposed for ultra wide band applications. The proposed antenna posses a method to minimize the monopole antenna by loading of inverted L-strip over the conventional monopole patch antenna to lower the height of the antenna. The ground was vertically extended toward two sides of the single radiator. The antenna is practically fabricated and simulated. Measured results shows a good agreement with simulated results. The prototype with overall size of 25 mm × 25 mm × 1.6 mm achieves good impedance matching, constant gain, stable radiation patterns, and constant group delay over an operating bandwidth of 2.6-13.04 GHz (10.44 GHz).

Annular-ring antenna for UWB applications

A square-ring microstrip antenna for CP Operation is proposed. Theoretical modal for an antenna is developed using modal cavity model and circuit theory concept. The proposed antenna is also simulated with MoM-based simulator. Theoretical and simulated results show good agreement with earlier reported experimental results. Antenna has a reduced antenna size and centre frequency as compared to the conventional circularly polarized square microstrip antenna with truncated corners at a given operating frequency. Square-ring with truncated corner shows 19% size reduction as compared to conventional CP microstrip antenna.

Design of dual band-notched UWB antenna

In this letter, a novel single-layer single-probefeed compact antenna is proposed for triband operation. In comparison to the previous triple band fractal antennas, the antenna dimension has a compact size of 25mmx25mm. Various iterations of the proposed fractal antenna are compared, and finally an optimized design is presented and fabricated. The proposed design is combination of minokwski and modified sierpinski carpet fractal patch antenna. The simulated and measured results show that the proposed fractal antenna can be used for WLAN/WiMAX applications.

Compact Cross Shaped Slit Circularly Polarized Microstrip Antenna for GNSS Applications

In this article, a compact design and experimental study of microstrip-line fed annular-ring shaped antenna is presented. The antenna consists of two annular-rings that are diagonally attached to each other with a semi-circular ring and a modified L-shaped ground plane. The proposed antenna provides a ultra wide bandwidth from 3.0 to 15 GHz with 10-dB return loss, which evidently covers entire UWB band (3.1-10.6 GHz). In addition, the antenna has a significantly compact size of 25×25×1.6 mm3. The measured and simulated results confirm the usefulness of the antenna for ultra wideband applications.

Design of quad band 2×2 planar microstrip array

A CPW feed UWB microstrip antenna with dual band-notched characteristics for WiMAX (3.3-3.7 GHz) and WLAN (5.15-5.825 GHz) band rejection is proposed. The overall antenna size is 25 mm × 25 mm × 1.6 mm. By cutting a L-shape slot in the ground plane WLAN band can be restricted and a stub is used between the two inverted L-shape structure of patch for rejection of the WiMAX band. The measured results demonstrate that the proposed antenna has good omnidirectional radiation patterns with appreciable gain across the operating bands. The measured impedance bandwidth defined by VSWR <; 2 of 11.7 GHz (2.7-14.4 GHz), with the two notched bands of 3.1-3.8, and 4.8-5.8 GHz, is obtained.

An annular-ring slot antenna with pair truncated corners for CP operation

A compact single feed circularly polarized micro strip antenna with cross shaped slits is proposed for GNSS (Global Navigation Satellite System) applications. In this paper, four cross shaped slits are embedded at the corners of a cross slot loaded square patch thus improving axial ratio bandwidth. In addition, five cross slots are cut on the ground plane for achieving better compactness and superior return loss. The proposed structure is about 60% compact in size when compared with the conventional micro strip antenna design. It has also been observed that the resonant frequency is highly dependent on length and width of the centred cross slot and embedded corner cross slits. The 3-dB axial ratio bandwidth achieved is 2.2%.