Download Millimeter-Wave Antennas: Configurations and Applications by Jaco du Preez, Saurabh Sinha PDF
By Jaco du Preez, Saurabh Sinha
This e-book comprehensively stories the state-of-the-art in millimeter-wave antennas, lines very important fresh advancements and gives info on a variety of antenna configurations and functions. whereas basic theoretical elements are mentioned every time invaluable, the publication basically makes a speciality of layout rules and ideas, manufacture, size recommendations, and useful effects. all of the quite a few antenna forms scalable to millimeter-wave dimensions is taken into account separately, with assurance of leaky-wave and surface-wave antennas, published antennas, built-in antennas, and reflector and lens platforms. the ultimate chapters tackle the topic from a platforms standpoint, delivering an summary of assisting circuitry and analyzing intimately diversified millimeter-wave purposes, together with high-speed instant communications, radio astronomy, and radar. The colossal volume of data now to be had on millimeter-wave structures could be daunting for researchers and architects coming into the sector. This ebook bargains readers crucial suggestions, assisting them to achieve a radical figuring out in response to the latest examine findings and serving as a valid foundation for knowledgeable decision-making.
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Extra resources for Millimeter-Wave Antennas: Configurations and Applications
Fig. 8 Substrate/superstrate structure of a two-dimensional leaky-wave antenna Fig. 9 Construction of a partially reflecting surface using metal patches 32 2 Leaky-Wave Antennas Larger rectangular microstrip elements will result in a narrower beamwidth. This structure is very suitable for photolithographic fabrication. A similar conﬁguration to the one shown in Fig. 9 is to replace the patches with slots. Conversely, smaller slots will result in a narrower beamwidth, and it should be noted that the surface wave feeding the antenna is directed in the y-direction (rather than in the x-direction as with the microstrip array).
11. The work also illustrated the differences between the leaky-wave properties of the TE20 and TE10 modes, concluding that the TE20 mode exhibits improved radiation properties compared to the TE10 mode. Discussed earlier in this chapter, the design highlighted the importance of substrate permittivity and slot periodicity with regard to radiation efﬁciency, directivity, and frequency scanning capability. Several other reports on leaky-wave antennas based on substrate integrated waveguides have surfaced in recent years.
7. The fundamental mode that propagates along the Goubau line is bounded. It can therefore be used as a leaky-wave antenna by adding dipole sources along the Fig. 6 The Goubau transmission line in its planar form 30 2 Leaky-Wave Antennas Fig. 7 Transverse dipole array with a Goubau transmission line. Note once again the absence of a ground plane transmission line. The transverse planar dipole sources are periodic perturbations along the line and they give rise to an inﬁnite number of space harmonics.