Arrangement for connecting selected antennas to a radio for transmitting and receiving
AssigneeGeneral Electric Company
InventorsRalph Etherington, Joe B. Linker, Jr.
Life of this patent
Estimating the term…
Abstract
A single terminal for a radio transmitter and receiver is connected to a first antenna for transmitting, and simultaneously to the first antenna or a second antenna for receiving. The connection is provided by a three port circulator having a first port connected to the first antenna, a second port connected through a quarter wavelength transmission line to a PIN diode and the second antenna, and a third port connected to the radio terminal. The radio transmitter is normally connected to the first antenna through the circulator, and the first or the second antenna is selectively and simultaneously connected to the radio receiver depending upon the conductive condition of the PIN diode.
Claims8
An improved arrangement for selectively coupling first and second antenna terminals to a single radio terminal, comprising:
- a. a circulator having first, second, and third terminals and arranged so that energy applied to said first terminal becomes available at said second terminal, that energy applied to said second terminal becomes available at said third terminal, and that energy applied to said third terminal becomes available at said first terminal;
- b. means coupling said first circulator terminal to said first antenna terminal;
- c. means coupling said third circulator terminal to said radio terminal;
- d. a transmission line having a length that is an odd multiple, including unity, of a quarter wavelength at a selected radio frequency;
- e. means coupling a first end of said transmission line to said second circulator terminal;
- f. means coupled to a second end of said transmission line for selectively applying a very low or very high impedance thereto;
- g. and means coupling said second end of said transmission line to said second antenna terminal.
An improved arrangement for selectively coupling a single terminal associated with a radio transmitter and receiver to first and second antennas comprising:
- a. a circulator coupled to said single terminal and to said first antenna terminal for applying signals from said radio transmitter to said first antenna;
- b. and control means coupled to said circulator and to said second antenna for selectively causing signals from said first antenna to be applied to said single terminal for receiving at the same time said transmitter signals are applied to said first antenna, and for alternatively and selectively causing signals from said second antenna to be applied to said single terminal for receiving at the same time said transmitter signals are applied to said first antenna.
Dependencies are inferred from the claim text.