Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Making electromagnetic wavelets II: Spheroidal shell antennas   In the companion paper, a coherent charge-current distribution for radiating
electromagnetic wavelets was constructed on an oblate spheroidal surface S_a.
Its main drawback was the necessity of including magnetic along with electric
charges, making the sources impossible to realize. Here we show how this
difficulty can be overcome by using Hertz potentials to generate a
charge-current distribution due solely to bound electric charges. However, this
distribution still appears difficult to realize because it consists of multiple
surface layers on S_a. We show how it can be replaced by a simple volume
distribution on a spheroidal shell. Our method generalizes the usual
construction of equivalent Huygens sources, based on boundary conditions on an
interface between electromagnetic media, by allowing the transition to be
gradual without incurring addition complexity.

34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex