Samir Dev Gupta

Triple Band Notched UWB Antenna Design Using Electromagnetic Band Gap Structures

A circular monopole antenna for ultra wideband (UWB) applications with triple band notches is proposed. The proposed antenna rejects worldwide interoperability for microwave access WiMAX band (3.3 GHz–3.8 GHz), wireless local area network WLAN band (5.15 GHz–5.825 GHz) and X-Band downlink satellite communication band (7.1 GHz–7.9 GHz). The antenna utilises mushroomtype and uniplanar Electromagnetic Band Gap (EBG) structures to achieve band-notched designs. The advantages of band-notched designs using EBG structures such as notch-frequency tuning, triple-notch antenna designs and stable radiation pattern are shown. The effect of variation of EBG structure parameters on which notched frequency depends is also investigated. Fabricated and measured results are in good agreement with simulated ones.

Design of band-notched antenna with DG-CEBG

ABSTRACT Ultra-wideband (UWB) disc monopole antenna with crescent shaped slot for double band-notched features is presented. Planned antenna discards worldwide interoperability for microwave access (WiMAX) band (3.3–3.6 GHz) and wireless local area network (WLAN) band (5–6 GHz). Defected ground compact electromagnetic band gap (DG-CEBG) designs are used to accomplish band notches in WiMAX and WLAN bands. Defected ground planes are utilised to achieve compactness in electromagnetic band gap (EBG) structures. The proposed WiMAX and WLAN DG-CEBG designs show a compactness of around 46% and 50%, respectively, over mushroom EBG structures. Parametric analyses of DG-CEBG design factors are carried out to control the notched frequencies. Stepwise notch transition from upper to lower frequencies is presented with incremental inductance augmentation. The proposed antenna is made-up on low-cost FR-4 substrate of complete extents as (42 × 50 × 1.6) mm3.Fabricated sample antenna shows excellent consistency in simulated and measured outcomes.

Design of Antenna Conformal to Cylindrical Surface for Aircrafts

Microstrip antenna are widely used on planar surfaces but here it has been conformed to cylindrical surface at 10 GHz that finds application in missiles which can be modeled in the shape of cylinder. An inset microstripline feed has been used because of its simplicity and ease of practical manufacturing. Moreover it provides very small stray radiation from the feed. Simulation and optimization for single patch and cylinder has been carried out on CST Microwave studio.

Dual Band Notched EBG Structure based UWB MIMO/Diversity Antenna with Reduced Wide Band Electromagnetic Coupling

Abstract A dual band-notched MIMO/Diversity antenna is proposed in this paper. The proposed antenna ensures notches in WiMAX band (3.3–3.6 GHz) besides WLAN band (5–6 GHz). Mushroom Electromagnetic Band Gap (EBG) arrangements are employed for discarding interfering frequencies. The procedure followed to attain notches is antenna shape independent with established formulas. The electromagnetic coupling among two narrowly set apart Ultra-Wide Band (UWB) monopoles is reduced by means of decoupling bands and slotted ground plane. Monopoles are 90° angularly parted with steps on the radiator. This aids to diminish mutual coupling and also adds in the direction of impedance matching by long current route. S21 or else mutual coupling of fewer than 15 dB is established over antenna operating range. Two-port envelope correlation coefficient is lower than 0.02 in UWB range of 3.1 GHz–10.6 GHz. The shifting in notch frequencies by varying variables in formulas is also reported. The suggested antenna is designed on low budget FR-4 substrate with measurements as ( 58×45×1.6

Multiband Microstrip Antenna for 4G Mobile Application

58 \times 45 \times 1.6

Improvement in bandwidth using multidielectric patch antenna

) mm3. Simulated and measured results of fabricated antenna are found to be in close agreement.

Reflection Phase Characteristics of EBG Structures and WLAN Band Notched Circular Monopole Antenna Design

In proposed work which has been analyzed and designed on IE3D tools, we cut a different types of slot like Lslot, Z-slot, U-slot and finally got the result at our desired frequency that is for 4G application at 2300MHz. In this research, we achieved multiband which is a essential parameter of wireless communication. The VSWR, Return loss, Bandwidth, Directivity, Gain is acceptable for this application. We have VSWR = 1.18 & Return loss = -21.5 dB at 2270MHZ. For this design we use RT Duroid as a substrate material with dielectric constant 2.2. These characteristics make the designed antenna suitable for 4 G applications.

Design and analysis of rectangular microstrip patch antenna conformal on spherical surface

The aim of the paper is to improve the bandwidth of the microstrip patch antenna. In this paper patch antenna using multidielectric layer is designed which improves the bandwidth. This antenna can be used for the X-band (10 GHz) applications. The improved bandwidth can overcome the inherent limitations of the microstrip patch antenna i.e. the low bandwidth. Design of the multilayer patch antenna with suitable permittivity and height of the substrate gives the desired result. Also, analysis and comparison of the design with and without dielectric layer is performed. Analysis based on the return loss, bandwidth and efficiency are also done. The simulations are performed on the ADS Tool.