Abstract
The method of this paper is based on change in the geometrical shape of the reflectarray plane which is similar to a concave shape and with this changing, it is tried to make the incident waves orthogonal as much as possible in order to remove the phase error caused by incident wave variation. The other benefit of this work is omitting frequency change error caused by path difference between reflectarray antenna bandwidth. Two types of reflectarray antennas operating at X-band frequency with a linear polarization are considered in this design: concave and flat reflectarray antennas with the diameter of 135 mm. elements which are used in this paper are variable-size patches. The proposed reflectarray antenna (concave) approximately has 25% 3-dB bandwidth which shows an increment in bandwidth about 18% compared to flat reflectarray antenna.
Highlights
Reflectarray antennas are the new generation of traditional parabolic reflectors
The first one is the usage of identical microstrip patches connected to variable-length delay lines [4]
In flat reflectarray with using previous equation, we can make the elements of the center plane and trapezoidal planes inphase but the major problem is making these elements inphase together
Summary
Reflectarray antennas are the new generation of traditional parabolic reflectors. They are combination of both printed phased arrays and parabolic reflectors [1]. The technique which is used in this paper is based on making the ground plane in form of a concave in order to cause the incident waves become orthogonal to the patches and reducing the frequency change error for increasing the bandwidth. For the first part of design a suitable degree (α) is required in which the maximum of reflection waves are situated in the main beam direction In this design, the reflectarray shape is considered as a square in which each side is 135 mm. With considering the ground plane size (135 mm) and with considering f/D to 1, we locate the phase center of the horn antenna in the 135 mm distance from the center of concave plane and examine the directivity according to the variation in α degree. The maximum directivity indicates the maximum reflection waves in the main beam direction
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