Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Finding Optimal Total Active Reflection Coefficient and Realized Gain
  for Multi-port Lossy Antennas   A numerically effective description of the total active reflection
coefficient and realized gain are studied for multi-port antennas. Material
losses are fully considered. The description is based on operators represented
in an entire-domain port-mode basis, i.e., on matrices with favorably small
dimensions. Optimal performance is investigated and conditions on optimal
excitation and matching are derived. The solution to the combinatorial problem
of optimal ports' placement and optimal feeding synthesis is also accomplished.
Four examples of various complexity are numerically studied, demonstrating the
advantages of the proposed method. The final formulas can easily be implemented
in existing electromagnetic simulators using integral equation solver.

23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th