A Practical Approach to Modeling Doubly Curved Conformal Microstrip Antennas - Abstract (original) (raw)
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Conformal Antennas and Integrated Design Procedures
At present radio communications and radio assistance services aboard aircrafts and helicopters are generally scattered among a number of antennas and sensors across the whole airframe. This policy, which is probably convenient from the point of view of equipment procurement, inevitably causes installation problems on medium/small aircraft, helicopters and UAVs, where only a reduced portion of the airframe surface is usually available for antenna location. Consequently, performance reductions have to be accepted, both due to antenna pattern distortion from the aircraft structures and to EMI among the sensors. This problem will probably become even more serious on multi-role vehicles, where different requirements have to be satisfied depending on the mission goal. A possible solution to the problem of antenna proliferation could be found in the field of conformal and multi-band antennas. An activity of analysis, modelling and evaluation has been performed and has dealt with the follow...
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.
This paper presents a generalized approach to derive the dyadic Green's function of arbitrary multilayer structures in planar, cylindrical and spherical coordinate systems. It is based on a full-wave equivalent-circuit representation that makes it possible to apply simple network analysis techniques. The planar stratified structures may be laterally bounded or open, the cylinders or spheres circumferentially closed or limited sectors. The procedure can be extended to other coordinate systems and anisotropic materials by means of a generalized transmission-line approach. For a demonstration of the applicability of this method, the derivation of the dyadic Green's functions in spectral domain of some commonly used cylindrical and spherical microstrip structures is presented.
A New Analytical Performance Model for a Microstrip Printed Antenna
acamedics.com
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 input impedance, return loss, voltage standing wave ratio and electric and magnetic fields is introduced in this paper. These parameters are given for TM 10 mode and TM 01 mode Epsilam-10 ceramic-filled Teflon substrate material.
Rigorous analysis of conformal microstrip patch antennas using the FDTD method
Microwave and Optical Technology Letters, 2003
corresponds to about 0.92-wavelength of the operating frequency at 5.5 GHz. The selection of the 50-mm spacing between the two monopoles was found to provide an optimal or near-optimal antenna gain enhancement for operating frequencies across the antenna's upper band (5.2/5.8-GHz bands). In addition, the sizes of the larger monopole in the center and the two smaller monopoles at the array's two sides were determined with the aid of the commercially available simulation software Ansoft High Frequency Structure Simulator (HFSS) in order to achieve two separate wide bandwidths to cover the 2.4/5.2/5.8-GHz bands. Also note that, for feeding the two smaller monopoles, two 100⍀ microstrip lines are used, which are printed on the substrate's front surface and oriented along the top edge of the ground plane in the back surface. The two 100⍀ microstrip lines are then connected to a 50⍀ microstrip line feeding the center monopole at the feed point.
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.
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.
2016
Conformity of the antenna to the mounting surface is the most essential requirement of modern communication system, whether it be antenna mounted on vehicles or airborne applications primarily due to the aero dynamical advantages of such antennas. In this paper we present the analysis of a inset microstrip line fed patch on cylindrical substrate with electrically small radius of 0.1 times free space wavelength. We try to analyse the effect that the bending has on the resonant frequency, inset length of the feed line of the patch antenna. We present the design dimensions, S11 & Radiation pattern results for the designed conformal patch antenna. KeywordsCylindrical Microstrip Patch Antenna (CMPA), Inset Microstrip Line Feed, Impedance Bandwidth, VSWR, Angular Width.
Progress In Electromagnetics Research M
In the design of a conformal patch antenna array, a special care must be taken regarding the placement of elements and curvature bending. Presently, the authors try to explain the effect of these two factors on the key parameters such as return loss, mutual coupling, gain and directivity. Here, the analyses of parameters are done under the consideration of dielectric coated two-element antenna array model. This paper attempts to examine the characteristics of the dielectric coated conformal antenna array by varying its inter element spacing on the changing cylindrical geometry. The twoelement conformal array is considered in E-plane and H-plane configurations, and its parameters are analyzed using full wave analysis and verified by HFSS tool. A comparative study shows that the E-plane configuration gives better result than H-plane configuration.
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...