# An Accurate Circuit Model for Photoconductive Antennas

## TL;DR

This paper introduces a novel, accurate circuit model for THz photoconductive antennas that captures frequency-dependent behavior, enabling better prediction and analysis of their performance.

## Contribution

A new equivalent circuit model for THz photoconductive antennas is proposed, incorporating frequency dependence and carrier screening effects, validated against experimental data.

## Key findings

- Model shows excellent agreement with measurements
- Captures frequency-dependent behavior of antennas
- Enables improved design and analysis of THz antennas

## Abstract

THz photoconductive antennas are among the most popular devices for THz wave generation and detection. A novel and accurate circuit is proposed to model the performance of such antennas, especially those which are frequency dependant. The suggested equivalent circuit consists of an external source voltage, a source input admittance, a loss resistance related to the electrode loss resistance, a frequency-dependant capacitance associated with capacitive behavior of the gap between the electrodes, and a controlled voltage dependant source representing the screening of photo-carriers. Based on this model, the radiation from a simple frequency dependent antenna, i.e. a dipole antenna, is investigated. Excellent agreement is observed between the obtained results by the proposed equivalent circuit model and those by measurement.