By Robin Collyns
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3) With an r between 4 and 10. The material can consist of ceramic, quartz, or alumina. Although there are materials with r much higher than 10, one should be careful in using these materials. As is discussed later, they can significantly reduce the antenna’s radiation efficiency. A single microstrip patch can be excited either by a coaxial probe or by a microstrip transmission line as shown in Fig. 1-17. For an array of microstrip patches, the patches can be combined either with microstrip lines located on the same side of the patches or with microstrip-lines/striplines designed on separate layers placed behind the ground plane.
As an example, for a rectangular patch with relatively dielectric constant of r, substrate thickness of h, and patch dimensions of w l as that shown in Fig. 4-1) Introduction 45 h w Equivalent Slots Fig. 1-18. Microstrip patch with two equivalent radiating slots. Yin G jB Yc jB G Fig. 1-19. Equivalent network of microstrip patch element. where Cmn is a constant that depends on the feed location, w and l dimensions, and the dielectric constant. Due to the very thin substrate, the fields are assumed to be z-directed only with no variation in the z-direction.
1-18. Microstrip patch with two equivalent radiating slots. Yin G jB Yc jB G Fig. 1-19. Equivalent network of microstrip patch element. where Cmn is a constant that depends on the feed location, w and l dimensions, and the dielectric constant. Due to the very thin substrate, the fields are assumed to be z-directed only with no variation in the z-direction. The most important dominant mode is the TM10 mode, which can be obtained if the dimension l is approximately g /2 ( g is the effective wavelength in the dielectric).
Did Spacemen Colonise the Earth? by Robin Collyns