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SIMPLE REALIZATION OF FLOATING GROUND IN RF CONNECTOR

IP.com Disclosure Number: IPCOM000004708D
Original Publication Date: 2001-Apr-16
Included in the Prior Art Database: 2001-Apr-16
Document File: 1 page(s) / 4K

Publishing Venue

Motorola

Related People

Hartmut Mack: AUTHOR

Abstract

SIMPLE REALIZATION OF FLOATING GROUND IN RF CONNECTOR

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SIMPLE REALIZATION OF FLOATING GROUND IN RF CONNECTOR

by Hartmut Mack

INTRODUCTION

Radio communication systems are challenged by tunnels because the tunnel influences radio signal propagation.

In railway tunnels, additional antennas can be implemented by coaxial radiating cables in parallel to the rails. The cables are coupled to devices with metal housings. It is required to block any unwanted direct current (d.c.) signals from the cables to the housings, but to forwards radio frequency (r.f.) signals only.

SOLUTION

As illustrated by the figure, the cable (1) is mechanically attached to the housing (4) by a connector (2). The outer conductor of the cable (1) is galvanically connected to a thread (3).

When the connector (2) is inserted into the housing (4), an insulator (7) blocks d.c. current by galvanically isolating the thread (3) from the housing (4).

The thread (3) is attached to its counterpart, a nut (5) that presses a printed circuit board (PCB, 6) to the inside (9) of the housing (4). The PCB (6) has layers A and B bridged by 4 SMD-capacitors (8).

Layer B is galvanically connected to the inside (9) of the housing (4). The r.f. signal goes from the thread (3), via the nut (5), the layer A, the capacitors (8) and the layer B to the inside (9) of the housing (4).

[See the accompanying PDF file for the Figure]