Binod Kumar Kanaujia

Design of Compact F-Shaped Slot Triple-Band Antenna for WLAN/WiMAX Applications

This communication presents a small, low-profile planar triple-band microstrip antenna for WLAN/WiMAX applications. The goal of this communication is to combine WLAN and WiMAX communication standards simultaneously into a single device by designing a single antenna that can excite triple-band operation. The designed antenna has a compact size of

Analysis of Gunn integrated annular ring microstrip antenna

19 \times 25\;\text{mm}^{2}

Design of Koch Fractal Circularly Polarized Antenna for Handheld UHF RFID Reader Applications

(

Design considerations for the development of the annular ring microstrip antenna

0.152 \lambda_{0}\;\times 0.2 \lambda_{0}

Analysis and Design of Gap-Coupled Annular Ring Microstrip Antenna

). The proposed antenna consists of F-shaped slot radiators and a defected ground plane. Since only two F-shaped slots are etched on either sides of the radiator for triple-band operation, the radiator is very compact in size and simple in structure. The antenna shows three distinct bands I from 2.0 to 2.76, II from 3.04 to 4.0, and III from 5.2 to 6.0 GHz, which covers entire WLAN (2.4/5.2/5.8 GHz) and WiMAX (2.5/3.5/5.5) bands. To validate the proposed design, an experimental prototype has been fabricated and tested. Thus, the simulation results along with the measurements show that the antenna can simultaneously operate over WLAN (2.4/5.2/5.8 GHz) and WiMAX (2.5/3.5/5.5 GHz) frequency bands.

Defected Ground Structure: Fundamentals, Analysis, and Applications in Modern Wireless Trends

The analysis conducted on Gunn integrated annular ring microstrip antenna and evaluation of various parameters such as input impedance, voltage standing-wave radio voltage standing wave ratio (VSWR), return loss, bandwidth, radiation pattern, beamwidth, etc., as a function of bias voltage and threshold voltage reveals that the Gunn loaded patch offers wider tunability, better matching, enhanced radiated power as compared to the patch alone. Bandwidth of the Gunn loaded patch improves to 11.07% over the 7.9% bandwidth of the patch whereas the radiated power is enhanced by 3.7 dB as compared to the patch.

Triple Band Notched UWB Antenna Design Using Electromagnetic Band Gap Structures

In this study, a novel design of circularly polarized antenna based on Koch fractal geometry is presented and experimentally investigated. Circular polarization and size reduction are achieved by placing two asymmetric Koch fractal geometries on x-and y-planes of the single-probe feed square radiator. Further, to tune resonant frequency around the 911MHz, four arrow-shaped slots are inserted in diagonal axes of the square radiator. It is perceived that compact size of the antenna can be achieved by increasing the overall size of the arrow-shaped slots and indentation angles of Koch fractal geometry. The antenna is fabricated on FR4 substrate with a size of 54 × 54 × 1.6 mm3 (0.162λ0 × 0.162λ0 × 0.0048λ0 at 900 MAbstract-In this study, a novel design of circularly polarized antenna based on Koch fractal geometry is presented and experimentally investigated. Circular polarization and size reduction are achieved by placing two asymmetric Koch fractal geometries on xand y-planes of the single-probefeed square radiator. Further, to tune resonant frequency around the 911MHz, four arrow-shaped slots are inserted in diagonal axes of the square radiator. It is perceived that compact size of the antenna can be achieved by increasing the overall size of the arrow-shaped slots and indentation angles of Koch fractal geometry. The antenna is fabricated on FR4 substrate with a size of 54 × 54 × 1.6 mm3 (0.162λ0 × 0.162λ0 × 0.0048λ0 at 900 MHz) and tested to validate the proposed design. The 3-dB axial-ratio bandwidth and impedance bandwidth of the proposed antenna design are found to be 8 MHz (907.0-915 MHz) and 37.0 MHz (891.0-928.0 MHz), respectively. The measured results confirm that the proposed design covers US radio-frequency identification (RFID) band (902-928 MHz) and can be used for RFID short-range reading applications.Hz) and tested to validate the proposed design. The 3-dB axial-ratio bandwidth and impedance bandwidth of the proposed antenna design are found to be 8 MHz (907.0-915 MHz) and 37.0 MHz (891.0-928.0 MHz), respectively. The measured results confirm that the proposed design covers US radio-frequency identification (RFID) band (902-928 MHz) and can be used for RFID short-range reading applications.

Bandwidth enhancement of L-probe proximity-fed annular ring microstrip slot antenna

The design considerations for development of the annular ring microstrip antenna are considered and consequently various parameters such as input impedance, VSWR, return loss and radiation pattern have been theoretically investigated as a function of frequency for different feed locations with a view to optimizing the feed location for proper matching and radiation. It has been observed that resonance occurs at 3.285 GHz, which is invariant with feed location. The antenna behaves as an RL network below resonance and as an RC network above resonance and shows perfect matching at a feed location of 3.35 cm from the centre. The percentage bandwidth is found to decrease and radiated power to increase with increasing ratio of outer to inner radius of the ring antenna.

Triple band circularly polarized compact microstrip antenna with defected ground structure for wireless applications

Theoretical investigation conducted on gap-coupled annular ring microstrip antenna is found to exhibit frequency tunability with the gap. The various parameters of the antenna such as input impedance, VSWR, return loss, and radiation pattern have been investigated as a function of gap length and feed point. It is found that the various parameters of gap-coupled microstrip antenna depend heavily on the gap length and feed points.

Double MOS loaded circular microstrip antenna for frequency agile

Slots or defects integrated on the ground plane of microwave planar circuits are referred to as Defected Ground Structure. DGS is adopted as an emerging technique for improving the various parameters of microwave circuits, that is, narrow bandwidth, cross-polarization, low gain, and so forth. This paper presents an introduction and evolution of DGS and how DGS is different from former technologies: PBG and EBG. A basic concept behind the DGS technology and several theoretical techniques for analysing the Defected Ground Structure are discussed. Several applications of DGS in the field of filters, planar waveguides, amplifiers, and antennas are presented.