User Manual

INTRODUCTION
Proprietary Information
Title: BEAMER Array System-
Assembly and Operation Manual
Doc. No.: 913000100 Rev.: 00
Page: 15 of 92
Band filter
Band filter
Micro-
Controller
Power
conditioner
PA
LNA
Figure 2: BEAMER block diagram
The antenna elements of the Tx and Rx channels are vertically and/or ± 45° slant polarized. The
separation between the receive and transmit antenna elements, and the resulting 20 dB of isolation,
enables the use of two separate band pass filters in front of the antenna elements instead of having to
use a much more complex diplexer structure.
The band pass filters (BPF) supply enough Tx/Rx channel isolation to ensure that the small amount of
Tx signal power and Tx wide band noise power leaking into the sensitive receive channel will not
degrade the Rx channel performance.
The Rx amplifier is a low noise amplifier with a high enough intercept point that several cellular
channels received simultaneously should not degrade each other's performance. The low noise and
high gain performance of this amplifier compensate for the high losses of the coaxial cable going
down from the Rx BEAMER front-end to the base station. The Tx Amplifier is a power amplifier that
enables up to 2 Watts average at the Tx antenna element of the BEAMER while compensating for
gain and power losses in the coaxial cable coming up from the base station.
1.2.1. BEAMER Family Modular Concept
The BEAMER family of products is modular. Each member can be attached to other modules to
establish a new product, matched to specific customer requirements. This concept is illustrated in the
following figure.