Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extending the scanning angle of a phased array antenna by using a
  null-space medium   By introducing a columnar null-space region as the reference space, we design
a radome that can extend the scanning angle of a phased array antenna (PAA) by
a predetermined relationship (e.g. a linear relationship between the incident
angle and steered output angle can be achieved). After some approximation, we
only need two homogeneous materials to construct the proposed radome layer by
layer. This kind of medium is called a null-space medium, which has been
studied and fabricated for realizing hyper-lenses and some other devices.
Numerical simulations verify the performance of our radome.

14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph