Welcome to the forum!
You can insert
\centering in that cell, but then also use
\arraybackslash and the
array package.
By the way, while commonly variables are written using an italic/cursive font, operators, units, and other expressions are usually written upright. There are commands for this, such as
\sin and
\cos. You can define new operators or use
\mathrm for Roman (upright) font. Like this:
Code: Select all
\documentclass{article}
\usepackage[font=sc]{caption}
\usepackage{array}
\newcommand*{\AM}{\mathrm{AM}}
\newcommand*{\RF}{\mathrm{RF}}
\newcommand*{\IF}{\mathrm{IF}}
\newcommand*{\DC}{\mathrm{DC}}
\begin{document}
\begin{table}[ht]
\caption{Current amplitude response at low frequencies in the mmw band (small signal regime)}
\centering
\begin{tabular}{lp{8cm}}
\hline\hline
& \centering\arraybackslash $i(2\omega_{\RF}\pm\omega_{\IF})$\\
\hline
OB2B& \begin{equation}
\Re P_0 m_{\AM}m_{\RF}^2\sin^2 \varphi_{\DC} \label{gain_OB2B}
\end{equation}\\
SSMF& \begin{equation}
\Re P_0 m_{\AM}m_{\RF}^2\sin^2 \varphi_{\DC}(1\pm j \alpha \kappa P_0 \beta L \omega_{\RF}) \label{gain_SSMF}
\end{equation}\\
\hline\hline
\end{tabular}\label{gainTable1}
\end{table}
\end{document}
You can also check good modern books in your field of science how they display operators, units, and other text in mathematical equations.
You could also consider using small caps instead of writing caption texts all in capital letters, which some may not consider good style. Using
\textsc,
\scshape, or the
caption package with
sc. Click on "Run LaTeX here" to see how it looks.
Stefan
