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Extra resources for 02.Antennas and Propagation

Sample text

Power Dividers Selecting the way RF power is combined or distributed within the array is a major architectural choice. Constrained (or often termed corporate) power divider networks can be fabricated using waveguide, coaxial line, stripline, or any of the various printed circuit transmission media like microstrip, slot line, and others. Aside from the choice of transmission medium, the most important choice is the selection of an organization for the aperture. Many arrays use a power divider network with as many ports as antenna elements.

Unmatched (a) and matched (b) two-way power dividers. Zs Zl k3 Zl (c) l3 Z5 Z3 l2 Z2 l1 Z1 Stripline Strip Microstrip Substrate (d) Figure 23. (a) Quarter-wave impedance transformer, (b) top view of a patch antenna, (c) microstrip edge feed with quarter-wave transformer, (d) multisection quarter-wave transformer. is also possible to obtain output signals in phase but with different power levels. Impedance matching circuits are another kind of antenna accessory. They are also manufactured in planar technology (2).

Again the elements at the front face of the array receive the distributed power, and phase shifters provide the necessary phase correction and scanning control. The back face of the array is short-circuited, so the RF signal goes through the phase shifter twice before it radiates. This tends to make reflectarrays somewhat more lossy and the phase shifter more tolerance sensitive than lens arrays. This feature, and undesirable feed blockage as indicated in Fig. 3(b), for low-angle radiation have made space-fed lens arrays the more popular choice for most space-fed systems.

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