Electromagnetic Band Gap Structures in Antenna Engineering
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It helps you to understand EBG applications in antenna engineering through an abundance of novel antenna concepts, a wealth of practical examples, and complete design details. The first book covering EBG structures and their antenna applications, this provides a dynamic resource for engineers, and researchers and graduate students working in antennas, electromagnetics and microwaves.
Understand EBG theory, analysis and applications with this authoritative survey which includes a wealth of practical examples, and complete design details.
Electromagnetic Band Gap Structures: Practical Tips and Advice for Antenna Engineers
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Analysis of a Novel Electromagnetic Bandgap Structure for Simultaneous Switching Noise Suppression
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Orlandi, "Accurate and efficient analysis of planar electromagnetic band-gap structures for power bus noise mitigation in the GHz band", Progress In Electromagnetics Research B, Vol. Shahparnia, Ramahi, M. Elek, Francis, G. Peng, C. Ruan, and J. Bao, G. Ruvio, and M. Kamgaing, and O.
Learn More - opens in a new window or tab Any international shipping is paid in part to Pitney Bowes Inc. Use the link below to share a full-text version of this article with your friends and colleagues. Forgot your password? As the gap decreases the stop band shifts towards the lower end due to an increase in the capacitance value. There are 3 items available. The inductor L 2 is due to microstrip lines connected with the centre patch and the capacitance C 2 is due to the dielectric between the microstrip line and ground.
Open Journal Systems. User Username Password Remember me. Font Size. Some of the theoretical analyses and models for the EBG structures are available in references [].
- Electromagnetic Band Gap Structures in Antenna Engineering - giuliettasprint.konfer.eu.
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Many techniques are presented for design of dual band and multiband EBG structures in the open literature but most of them are having narrow or small bandwidth []. In [19], double U type slot is made in the patch to generate multiple band, [20] uses a fractal structure to generate the dual band characteristic, while [21] uses a spiral type structure to generate multiband characteristic. In this paper, single band and dual band EBG structures having wide bandwidth have been proposed. The periodic nature of microstrip circuits is used to get dual band EBGs. Equivalent circuits of proposed EBGs are also presented.
The orientation of paper is such that, in the second section, single band EBGs are proposed and discussed while in the third section dual band EBGs are proposed and discussed. The material used is FR-4 substrate having dielectric constant 4.
To validate the simulation results, the EBGs are fabricated and tested. In this section, three different types of single band EBGs are proposed. The new EBGs are cross hair type, Swastika type and hexagonal patch type. The analyses of all the EBGs have been done by using microstrip line method.
Fan Yang, University of Mississippi, Yahya Rahmat-Samii, University of California, Los Angeles. Subjects: RF and Microwave Engineering, Electronic, Optoelectronic Devices, and Nanotechnology, Engineering, Wireless Communications. 5 - Patch antennas with EBG structures. This comprehensive, applications-oriented survey of Electromagnetic Band Gap ( EBG) engineering explains the theory, analysis, and design of EBG structures.
First, the ground plane is printed on one side of the substrate and the EBG array with via on the other side. Next, on another substrate, a 50 ohms line is printed without ground and the two structures are stacked as shown in Figure 1. Then the two ends of the 50 ohms line are connected to two ports and the S 21 is measured using proper excitation.
The transmission response of mushroom type EBG depends upon the size of the patch, diameter of via and the gap between the unit elements.
Holdings: Electromagnetic band gap structures in antenna engineering
The transmission characteristic also depends upon the thickness of the substrate and the substrate material used. The gap between the unit elements is taken as 1 mm, the via diameter 0. It can be seen from figure that as the patch size increases, the stop band shifts towards the lower frequency side and this is due to an increase in the capacitance value. For a mushroom type EBG, the value of capacitance 'C', inductance 'L' and resonance frequency f 0 are given by 1 , 2 and 3 respectively [2].
It is made by modification of the mushroom type EBG. It consists of a patch and a number of microstrip lines. The microstrip lines provide extra inductance as compared to the mushroom type EBG. The diameter of the via is 0. The transmission response of this EBG depends upon the width of the microstrip lines and gap between the unit elements.
As the width increases, the resonance frequency shifts towards the higher frequency side due to a decrease in the inductance value. As the gap decreases the stop band shifts towards the lower end due to an increase in the capacitance value. For the maximum bandwidth, the gap is optimized and found to be 0.
It can be seen from the figure that as the unit element size increases, the stop band shifts towards the lower frequency side due to an increase in the capacitance. The discontinuity in the cross hair type introduces capacitance; hence better resonance is obtained than cross hair. The inductor L is due to the via and capacitor C is due to the dielectric between the centre patch and the ground. The inductor L 2 is due to microstrip lines connected with the centre patch and the capacitance C 2 is due to the dielectric between the microstrip line and ground.
The capacitor C 1 is due to the gap between the two outer microstrip lines. The diameter of via is again taken as 0. The measured band of the swastika type EBG is seen shifted towards the higher frequency side; it is due to the fabrication constraint which keeps a little air gap between the EBG and the 50 ohm line and this air gap shifts the band towards the higher side. It can be seen from the figure that as g1 increases, the resonance frequency shifts towards the higher frequency side due to decrease in the capacitance value.
It is also observed that as gap g 1 increases, the bandwidth increases if dB bandwidth is considered. It can seen from the figure that as the via diameter increases, the stop band shifts towards the higher frequency side this is due to a decrease in the via inductance. It can be seen from the figure that the swastika type EBG has the lowest frequency of operation and highest bandwidth.
A hexagonal patch has been selected instead of the rectangular patch used in case of mushroom type EBG. The hexagonal patch has a side length of 4 mm and the diameter of via used is 1. FR-4 is used for the substrate having thickness of 1. The measured bandwidth obtained is 1 GHz 3. Table 1 shows the comparison of the dB cut-off frequencies and bandwidths of single band EBGs. From the comparison, it can be concluded that the Swastika type EBG has better performance in terms of bandwidth and compactness.
The microstrip circuit is periodic in nature, so the response of the circuit repeats after a certain frequency. This property can be utilized to develop a dual band EBG.
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- Electromagnetic Band Gap Structures in Antenna Engineering: Fan Yang, Yahya Rahmat-Samii: giuliettasprint.konfer.eu.
- Electromagnetic Band Gap Structures: Practical Tips and Advice for Antenna Engineers;
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Although all the EBG structures are capable of giving dual band nature, the size and shape of EBGs are crucial to get dual band in the desired frequency range. In this section, three different types of EBGs are designed for dual band. Finally, the cut-off frequencies and bandwidths of these EBGs are compared with a mushroom type EBG having same dimensions.