New PDF release: Microstrip Patch Antennas: A Designer's Guide

By Rod Waterhouse

ISBN-10: 1441953388

ISBN-13: 9781441953384

This useful gizmo offers the reader with a present review of the place microstrip patch antenna know-how is at, and helpful details on tips to layout this type of radiator for his or her given software and situation. useful layout instances are supplied for every objective.

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Additional resources for Microstrip Patch Antennas: A Designer's Guide

Example text

1 Microstrip Patch Antenna Concept 22 Simplistically when a voltage is applied to the feeding point the radiator, a current (or mode) will be excited on the patch and vertical electric fields will be generated between the patch and the ground plane. Because the now formed slots (between the edges of the patch and the ground-plane) are A/2 apart, the radiated fields will add constructively creating an efficient, resonant radiator. The radiation efficiency will depend upon the material used, as the confinement of the fields will be determined by the dielectric constant of the substrate and its height.

Therefore a compromise must be made between the overall size of the module and the mutual coupling between the elements. 11 (x". 12 shows the predicted return loss of the two circular patches as a function of frequency. Also shown in this diagram are the measured ISIII and ISzzI results obtained using a Wiltron 360 B network analyser connected to the two ports of the module. As the results show, the amount of coupling between the patches is relatively small, since experiment and theory are in good agreement.

2 Design Procedure For edge-fed patches mounted on relatively thin substrates, the design procedure for these antennas is relatively simple. 1) the width of a 50 Q feed line is calculated and the resonant length of the patch is calculated. 2) where Ee = (e, + 1)/2 There are probably better approximations for Ee , however, as this is only a starting point to an initial estimation, the extra effort to obtain a more accurate e, is not worth it. Once the approximate length has been calculated, the transmission line model or the cavity model can be used to give an estimation of the performance of the antenna.

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Microstrip Patch Antennas: A Designer's Guide by Rod Waterhouse


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