RADIO RELAY SYSTEMS

• US 3,865,990 A
• Filed: 03/22/1973
• Issued: 02/11/1975
• Est. Priority Date: 03/22/1972
• Status: Expired due to Term

• Current Assignee: Friedrich Kuenemund
• Original Assignee: Friedrich Kuenemund
• Inventors: Kuenemund, Friedrich
• Primary Examiner(s): Griffin, Robert L.
• Assistant Examiner(s): Bookbinder, Marc E.
• Application Number:
  US05/343,854
• Time in Patent Office: 691 Days
• Field of Search: 179/15FD 325/3 333/1,1.1,6,28 343/176,200,202
• US Class Current: 370/339
• CPC Class Codes: H01P 1/213 combining or separating two or more different frequencies H01P1/215 takes precedence
• CPC Class Codes: H04B 7/00 Radio transmission systems, i.e. using radiation field H04B10/00, H04B15/00 take precedence
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003

Abstract

A radio relay system in which a multiplex link is formed between a transmitting station and a receiving station via a plurality of adjacent high frequency channels comprising a group. Each channel has a channel filter in each station connected to an associated circulator that forms part of a cascade of circulators fed by or feeding the associated antenna. The filter elements of the group are connected in mutually opposite sequences relative the associated antenna with the circulator most remote from each antenna having a circulation direction opposite to that of the other circulators in the respective cascade.

Claims

1. A radio relay system in which several adjacent high frequency channels are combined to form a high frequency group, comprising:

a transmitting station including a transmitting antenna, a plurality of first three-arm circulators connected in cascade to said antenna, and a plurality of first channel band pass filters each connected to an arm of a respective first circulator, said first filters arranged with the filter centered at the highest channel frequency connected to the first circulator adjacent said transmitting antenna and the filter centered at the lowest channel frequency connected to the circulator farthest from said transmitting antenna; and

a receiving station incLuding a receiving antenna, a plurality of second three-arm circulators connected in cascade to said receiving antenna, and a plurality of second channel band pass filters each connected to an arm of a respective second circulator, said second filters arranged with the filter centered at the lowest channel frequency connected to that second circulator which is adjacent said receiving antenna and the filter of the highest channel frequency connected to the circulator which is farthest from said receiving antenna, the circulation direction of said farthest first and second circulators being opposite to that of the remaining circulators of the respective circulator cascades, a first resonator in said transmitting station connected to the arm of said farthest first circulator which follows the arm connected to the respective channel filter as viewed in the direction of circulation and a second resonator in said receiving station connected to the arm of said farthest second circulator which precedes the arm which is connected to the respective channel filter as viewed in the direction of circulation.

2. A radio relay system according to claim 1, wherein said resonators have the same structure as the filters connected to the respective circulators.

3. A radio relay system in which several adjacent high frequency channels are combined to form a high frequency group, comprising:

a transmitting station including a transmitting antenna, a plurality of first three-arm circulators connected in cascade to said antenna, and a plurality of first channel band pass filters each connected to an arm of a respective first circulator, said first filters arranged with the filter centered at the highest channel frequency connected to the first circulator adjacent said transmitting antenna and the filter of the lowest channel frequency connected to the circulator which is farthest from said transmitting antenna; and

a receiving station including a receiving antenna, a plurality of second three-arm circulators connected in cascade to said receiving antenna, and a plurality of second channel band pass filters connected to an arm of a respective second circulator, said second filters arranged with the filter of the lowest channel frequency connected to that second circulator which is adjacent said receiving antenna and the filter of the highest channel frequency connected to the circulator which is farthest from said receiving antenna, the circulation direction of said circulators being the same in the respective circulator cascades, a first resonator in said transmitting station connected to the arm of said farthest first circulator which follows the arm which is connected the respective channel filter as viewed in the direction of circulation, and a second resonator in said receiving station connected to the arm of said farthest second circulator which precedes the arm which is connected to the respective channel filter as viewed in the direction of circulation.

4. A radio relay system according to claim 3, wherein said resonators have the same structure as the filters which are connected to the respective farthest circulators.