Effect of Varying Curvature and Inter Element Spacing on Dielectric Coated Conformal Microstrip Antenna Array (original) (raw)
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International Journal of Computer Applications, 2016
This geometry can offer certain characteristics that can't be achieve by planner antenna. Antenna is design to function in 2.4 GHz wireless radio band. This work present performance of 4-element conformal antenna array for cylindrical surface and observe effect of mutual coupling between patch. In this, angle is preserved to conform the shape to reduce extra drag. The radius of cylinder is considered to be atleast one quarter wavelength or slightly more. The simulated results shows its resonant frequency is not affected with change in curvature however the radiation patterns are significantly affected more in elevation direction and less in azimuth. Simulations has been carried on CST software.
Conformal microstrip printed antenna
In this paper, the comprehensive study of the conformal microstrip printed antenna is presented. The main advantages and drawbacks of a microstrip conformal antenna are introduced. The earlier researches in cylindricalrectangular patch and conformal microstrip array are summarized. The effect of curvature on the conformal Microstrip antenna patch on conical and spherical surfaces is studied. Some new flexible antenna is given for different frequencies. Finally, simulation software is used to study the effect of the curvature on the input impedance, return loss, voltage standing wave ratio, and resonance frequency.
SDFW Analysis of Mutual Coupling on Microstrip Antenna Array Conformal to Curved
Abstract— In this paper, Analysis of mutual coupling on microstrip patch antenna array conformal to curved surface is studied for both E-plane and H-plane. Far field radiation patterns and current distributions on individual patches have been obtained and plotted. The effect of E-plane and H-plane separation between radiating elements on mutual coupling coefficients has been analyzed.The approach makes use of the popular and rigorously used spectral domain full wave analysis method in conjunction with method of moment as numerical analysis tool. The electric field due to rectangular patch is obtained by solving integral equation which involves Green's function in spectral domain. The integral equations thus formed are converted into a system of linear equations by the use of method of moment. In the method of moment, the unknown patch current is expressed into a set of linear combination of entire domain basis function weighted by unknown coefficients which are determined after solving linear system of equation. After determining current distribution on the patch antenna, the input impedance and radiation characteristics are obtained. To incorporate the effect of mutual coupling, the scattering matrix is used to describe the multiport network and mutual coupling coefficients are then obtained from scattering parameters. Simulations are done using MATLAB 2007b. Mutual coupling coefficients for E-plane and H-plane coupling are calculated by varying elemental spacing in both E and H-plane.
Loop-Shaped Patch Antenna for Conformal Arrays to Minimize the Effects of Adjacent Conducting Skin
Journal of Electrical Engineering & Technology, 2020
This article proposes a novel method of designing a loop-shaped slot patch antenna using an extended cavity structure to reduce the influence of adjacent conducting vehicle skin. The proposed antenna consists of the radiating patch, loop shaped slot, and an extended cavity structure. The radiating patch is directly connected to a hybrid chip coupler to achieve a circular polarization property, and the extended cavity structure is employed to confine the near-field within the radiating patch that allows to have less influence of the conducting skin and to increase the effective permittivity of the proposed antenna. To verify the effectiveness of the proposed conformal array antenna, we fabricate 2 × 2 array antenna with and without an adjacent conducting skin, and its performances, such as bore-sight gains and 2-D radiation patterns are measured in a full anechoic chamber. The results confirm that the proposed antenna structure is suitable for elements of the conformal array, which is less affected by the conducting skin of the airframe.
IMAPSource Proceedings
There is growing interest in the use of additive manufacturing for the fabrication of RF devices due to fast prototyping capabilities and the use of less material as opposed to traditional fabrication techniques. In addition to the previously mentioned advantages, the aerosol jet printing method in particular allows for the conformal printing of RF components. This work models the effect of the bend radius on the return loss and radiation pattern of a dual-band (28 GHz and 39 GHz) mm wave patch antenna array design that will be aerosol jet printed. The antenna is modeled on a 5-mil thick flexible substrate (PET) and the simulation is run from 27 GHz to 40 GHz using HFSS. The return loss and radiation pattern results of the antenna are compared for various bend radii (0.25 in to 2 in) of the conformal surface the antenna is to be printed upon. Simulation results show a maximum frequency deviation of about 400 MHz on the return loss for the low (28 GHz) frequency band of the antenna w...
A Practical Approach to Modeling Doubly Curved Conformal Microstrip Antennas - Abstract
Journal of Electromagnetic Waves and Applications, 2003
Designers are increasingly integrating conformal microstrip antennas into the curved structures of either air or land vehicles. Quite often, these structures are doubly curved (e.g. curved along two orthogonal surface directions). This practice necessitates the development of accurate codes versatile enough to model conformal antennas with arbitrarily shaped apertures radiating from doubly curved surfaces. Traditional planar-structure-based design techniques are not well suited for this application. A hybrid finite element-boundary integral formulation appropriate for the high-frequency analysis and design of doubly curved conformal antennas is introduced in this paper. The novelty of this approach lies in its use of an asymptotic prolate spheroidal dyadic Green's function to model the physics of curved surface diffraction. To demonstrate the utility of this approach, the effects of curvature on the resonant frequency and input impedance of both a doubly curved conformal square and circular patch antenna are investigated. Different feed positions are also considered. Due to a paucity of published experimental data, the numerical results are benchmarked by comparison with the results for planar square and circular patch antennas. The planar results are obtained by using an experimentally validated planar finite element-boundary integral code.
Curvature has a great effect on fringing field of a microstrip antenna and consequently fringing field affects effective dielectric constant and then all antenna parameters. A new mathematical model for return loss mutual coupling coefficient as a function of curvature for two element array antenna is introduced in this paper. These parameters are given for TM 01 mode and using three different substrate materials RT/duroid-5880 PTFE, K-6098 Teflon/Glass and Epsilam-10 ceramic-filled Teflon.
The cylindrical geometry can o®er certain desirable antenna characteristics that are not provided by planar elements. In this paper, a three-element cylindrical conformal array antenna has been presented as a candidate for use in wireless communications and Radio Fre- quency Identi¯cation (RFID). Each element in the array is a microstrip fed rectangular patch antenna designed to resonate at 2.4 GHz. Once the desired results were obtained for a single element, each element in the conformal cylindrical array has been then designed using the same dimensions and parameters. Modeling and performance evaluation of the array has been carried out using the commercially available electromagnetic software CST Studio SuiteTM 2009. Sim- ulations have been conducted to study the performance of the proposed conformal array as well as the e®ects of small radius cylinder on mutual coupling and the radiation pattern of the array. The cylindrical radii in consideration are of about one quarter wavelengths or slightly more. The radius of cylinder used in simulation is taken to be 0.24¸ and 0.32¸. Compared with the existing cylindrical conformal antenna, the proposed array antenna possesses a reduction in cylindrical structure radius with acceptable ominidirectionality and gain needed for wireless communications and RFID applications.
Four Element Conformal Array Antenna for X-band and Ku-band applications
In this research, we proposed a design of array antenna which is conformal to the cylindrical surface for multiband operation. This Multiband operation can achieved by incorporating guard line section in +u,-u and +v plane which is shown in figure 1. Operating frequency for Single element microstrip antenna is 9.2 GHz. These Guard line 1, 2&3 resonating in X band at frequency 8.7GHZ and 11.8GHz for planner surface and resonating in Ku band at 15.38 GHz for non-planner surface (cylindrical surface). Array of two element and four element is introduce for conformal applications which needed large bandwidth operated at separated transmitter receiver frequency. When two or more frequency is needed apart from each other than the no. of antenna can minimize by using multiband antenna. Return loss, gain, directivity has been calculated from simulated results for proposed antenna by using CST software.