Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A novel dual-band balun based on the dual structure of composite
  right/left handed transmission line   Utilizing the opposite phase shifting property of a standard Composite
Right/Left Handed (CRLH) transmission line (TL) and a dual structure of CRLH
(D-CRLH) TL, a dual-band balun is designed. The dual-band balun is formed by a
1x2 (3-dB) splitter with a D-CRLH phase-shifting line in the top branch and a
CRLH phase-shifting line in the bottom branch. The performance of the balun is
verified with circuit simulation at 2.4 GHz and 5.0GHz. The balun exhibits a
very wide bandwidth for differential output phase, the return loss is well
below -100dB, and the insertion losses |S12| and |S13| are around -3.03dB at
both frequencies.

9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio