Antenna Pattern Retrieval From Reflection Coefficient Measurements With Reflective Loads

Abstract

Abstract-This paper presents a new method for antenna pattern retrieval from reflection coefficient measurements. A reflective load with known reflective properties is placed close to the aperture of the antenna under test. The reflection coefficient of the antenna is measured at the antenna feed with multiple different reflective loads. The antenna pattern is then solved from the measurements with an inversion method. This paper derives and verifies the analytical foundations needed to implement the method, and demonstrates the method both by simulations and experiments for a pyramidal horn antenna at 30 GHz.

On the One-Antenna Gain Measurement Method in Probe Station Environment at mm-Wave Frequencies

“…A radiation pattern retrieval technique was presented in [76], in which the reflection coefficient was recorded when a metal plate was moved above the AUT and the AUT aperture field distribution was retrieved numerically, then the radiation pattern is calculated by a near-field to far-field transformation. An antenna radiation pattern measurement method based on AUT reflection coefficient was reported in [77], in which a PEC plate and a PEC-dihedral corner reflector were placed in front of a high-gain horn antenna.…”

Lessons Learned about the Design and Active Characterization of On-Body Antennas in the 2.4 GHz Frequency Band

“…To avoid the electromagnetic compatibility problems caused by the metallic support of the transmitter (Tx) antenna, a non-conductive PVC (polyvinyl chloride) support was manufactured, since this material has dielectric properties similar to air. This solution has already been used in other works because of its low cost and because it allows to manufacture very robust structures by assembling plumbing pipes and joints [53][54][55][56]. The effects of this type of support have been considered negligible in some studies [57].…”

Antenna Measurements at Millimeter Wavelengths - Overview

“…In published 2port measurements at 50−110 GHz the AUT connected with the GSG probe is one port, while the other port with a horn antenna is moved around utilizing, e.g., a robotic arm [8], [9], [10], [11]. More recently, we have at Aalto University developed a 1-port method (see Figure 2), where the radiation field of the AUT is disturbed with a movable flat piece of good conductor and the radiation pattern and also the antenna gain are retrieved from the reflection measurements [12], [13].…”