Quasi-static analysis of microstrip lines with variation of substrate thickness in transverse direction (original) (raw)
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Microwave and Optical Technology Letters, 2002
mm is inset 19.25 mm from the center of a patch edge. The coaxial aperture has radius 1.75 mm. The resonant frequency, resistance, and reactance were measured as 1.55 GHz, 128.1 ⍀, and 48.6 ⍀, respectively. A circular capacitor patch is added. The probe is now penetrating the radiating patch and is connected to the center of the capacitor patch. The radius of the hole in the radiating patch is 2 mm. The impedance was calculated for a range of structures. Four different antenna elements were fabricated and measured. For the fabricated structures the distance between the patch and the capacitor patch is 3.4 mm. The measured resonant frequency in all cases stayed at 1.55 GHz, as expected. In Figure 3, the resonant impedance is given for several distances d 2 between the radiating and capacitor patch and for capacitor patch diameters ranging from 5 to 35 mm. The agreement is very good for the resistance. A small shift is seen in the reactance. It is probably due to the use of the approximate slot model. It is clearly seen that the inductance of the probe can be canceled out by selecting the configuration with zero inductance and 50 ⍀ resistance. This allows the bandwidth to be broadened considerably. IV. CONCLUSION A network model is given for the calculation of the effect of a top capacitor patch on the impedance of a microstrip antenna. The main advantages of the procedure are that it is a very fast a posteriori procedure, it is easily implemented, and it gives full physical insight. Therefore, it is a very practical tool for antenna designers that want to use the concept of capacitive feeding.
, with emphasis on theoretical and practical design techniques. Available substrate materials are reviewed along with the relation between dielectric constant tolerance and resonant freqnency of microstrip patches. Several theoretical analysis techniques are summarized, including transmission-line and modal-expansion (cavity) techniques as well as numerical methods such as the method of moments and fmite-element techniques. Practical procedures are given for both standard rectangular and circular patches, as well as variations on those designs including circularly polarized microstrip patches. The quality, bandwidth, and efficiency factors of typical patch designs are discussed. Microstrip dipole and conformal antennas are summarized. Finally, critical needs for fnrther research and development for this antenna are identified.
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/comparative-analysis-of-bandwidth-enhancement-of-a-rectangular-microstrip-patch-antenna-using-capacitive-non-capacitive-coupled-feed https://www.ijert.org/research/comparative-analysis-of-bandwidth-enhancement-of-a-rectangular-microstrip-patch-antenna-using-capacitive-non-capacitive-coupled-feed-IJERTV4IS010446.pdf In the present Scientific, Technological scenario the use of Microstrip Antenna has raised tremendously because of its versatile features. So far as this paper is concerned, this paper presents a comparative study of a rectangular Microstrip patch antenna at Gigahertz (GHz) frequency using non contacting microstrip feed lines of length 14.5 mm and feed line of contacting length with superstrate. This means we created capacitive coupling between patch and feed line in the first case and in the later case Patch and Feed Line is connected well together. The results presented here are obtained using Ansoft High Frequency Structure Simulator (HFSS) 11.0 software which is based on full wave finite element method. In this designing a superstrate of thickness 5mm is also introduced to get the more precise results. Here it is very important to mention that the best performance of antenna i.e., below-10dB that we achieved in both Contacting and Non-Contacting cases, Bandwidth of 8% is obtained in contacting case and bandwidth of 6.4% is obtained when capacitive coupling is created between Patch and Feed Line. As a matter of course, we obtained resonance frequency of 17.2 GHz at solution frequency of 17.8 GHz.
IJERT-Analysis of Microstrip Antennas
International Journal of Engineering Research and Technology (IJERT), 2018
https://www.ijert.org/analysis-of-microstrip-antennas https://www.ijert.org/research/analysis-of-microstrip-antennas-IJERTCONV6IS13018.pdf Wireless technology is one of the main areas of research in the world of communication systems today and a study of communication systems is incomplete without an understanding of the operation and fabrication of antennas.This was the main reason for our selecting a project focusing on this field.The goal of this project is to analyse the Microstrip Patch Antenna which covers the GSM Band 0.8 to 1.9 GHz. This project covers study of basics and fundamentals of microstrip patch antenna. A series of parametric study were done to find that how the characteristics of the antenna depends on its various geometrical and other parameters. The various geometrical parameters of the antenna are the dimensions of the patch and ground planes and the separation between them and it also includes the dielectric constant of the substrate material.The parametric study also contains the study of different techniques for optimizing the different parameters of antenna to get the optimum results and performance. This is a simulation based study. The simulation of the antenna is carried out using Antenna magus simulation software and verified through matlab code. The simulation results of antennas indicate that the proposed antenna fulfils the excellent band characteristics for various frequency bands and showing the good return loss and radiation patters in the interested GSM band.
Design, Modeling, and performance Comparison of feeding techniques for a Microstrip Patch Antenna
Jurnal Teknologi, 2007
Microstrip patch antennas has a variety of feeding technique applicable to them. It can be categorized in accordance to the main power transfer mechanism from the feed line to the patch. Contacting feeds investigated in this work are coaxial probe feed and transmission line feed; while noncontacting feeds which are proximity-coupled-fed and the aperture-coupled-fed. This work is an effort to design, model, simulate, fabricate and measure all four different types of microstrip antenna's of noncontacting feed and contacting feed techniques on a similar sized, rectangular patch. Simulation is done using the circuit model (CM) derived from the Transmission Line Model (TLM), and is compared with another simulation set of feeding methods produced using the Method of Moments (MoM). Both methods are simulated on Microwave Office. This design intends to focus on studying the differences in measured and simulated parameters of the patch and its respective feeds, simulate it using MoM, and finally, the fabrication process. Radiation measurements are also presented. Designs for each feeding technique achieved the best return loss (RL) at the desired frequency range of 2.4 GHz. The fabricated hardware produced good RL, bandwidth (BW), and comparable radiation performance compared against simulation using MoM. All antennas produced maximum E-and H-plane co-and crosspolarization difference in the magnitude of -18 dB and half-power beam widths (HPBW) in the magnitude of 90 o .
Microstrip antenna analysis using the method of fundamental solutions
International Journal of Numerical Modelling-electronic Networks Devices and Fields, 2008
The method of fundamental solutions (MFS) is proposed for the analysis of microstrip patch antennas of arbitrary shape. The MFS consists mainly in approximating the solution of a problem by a linear combination of known fundamental solutions associated with source points located outside the domain. The implementation of the MFS is simple and computationally efficient. Simulation results are obtained for rectangular, circular and triangular microstrip patch antennas. The resonance frequency and input impedance results are in good agreement with those published in the literature. Two prototypes have been fabricated and tested. Good agreement has been obtained between the MFS simulations and the experimental results.