Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-profile Button Sensor Antenna Design for Wireless Medical Body Area
  Networks   A button sensor antenna for wireless medical body area networks (WMBAN) is
presented, which works through the IEEE 802.11b/g/n standard. Due to strong
interaction between the sensor antenna and the body, an innovative robust
system is designed with a small footprint that can serve on- and off-body
healthcare applications. The measured and simulated results are in good
agreement. The design offers a wide range of omnidirectional radiation patterns
in free space, with a reflection coefficient (S11) of -29.30 (-30.97) dB in the
lower (upper) bands. S11 reaches up to -23.07 (-27.07) dB and -30.76 (-31.12)
dB, respectively, on the human body chest and arm. The Specific Absorption Rate
(SAR) values are below the regulatory limitations for both 1-gram (1.6 W/Kg)
and 10-gram tissues (2.0 W/Kg). Experimental tests of the read range validate
the results of a maximum coverage range of 40 meters.

25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn