Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rectangular and Circular Antenna Design on Thick Substrate   Millimeter wave technology being an emerging area is still very undeveloped.
A substantial research needs to be done in this area as its applications are
numerous. In the present endeavor, a rectangular patch antenna is designed on
thick substrate and simulated using SONNET software, also a novel analysis
technique is developed for circular patch antenna for millimeter wave
frequency. The antenna is designed at 39 GHz on thick substrate and has been
analyzed and simulated.The results of the theoretical analysis are in good
agreement with the simulated results.

20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int