Waveguide apparatus and method for dual polarized and dual frequency signals
AssigneeVitalink Communications Corporation
InventorsJames M. Janky, Albert L. Horley
Life of this patent
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Abstract
A waveguide apparatus guides a first pair of horizontally polarized transmit and receive frequency signals independently of and in parallel with a second pair of vertically polarized transmit and receive frequency signals. The waveguide apparatus is constructed to operate across the 3.7 to 6.425 GigaHertz band with a very narrow bandwidth for the transmit frequency and a very narrow bandwidth for the receive frequency and with a single size of rectangular waveguide for separating the transmit and receive frequencies. This construction simplifies frequency separation filtering techniques and provides effective operation over this broad band with an apparatus which is efficient in terms of space, compact and implemented by a simple package.
Claims22
A waveguide apparatus for guiding a first pair of horizontally polarized transmit and receive frequencies independently of and in electrical parallel with a second pair of vertically polarized transmit and receive frequencies between a feed horn and related transmitter or receiver units,
- said waveguide apparatus being constructed to operate across the 4 to 6 GigaHertz band with a very narrow bandwidth for the transmit frequency and a very narrow bandwidth for the receive frequency and with a single size of rectangular waveguide for separating the transmit and receive frequencies,
- said waveguide apparatus comprising,
- polarization junction means connectable to an end of the feed horn and effective to separate the horizontally polarized receive frequency from the vertically polarized receive frequency as the receive frequencies flow from the horn toward the receive units and effective to guide the separated horizontally and vertically polarized transmit frequencies into joint flow through the common feed horn to the antenna,
- first frequency separating means for separating the vertically polarized pair of transmit and receive frequencies of very narrow bandwidth at opposite ends of the 4 to 6 GigaHertz band into separate flow paths for the transmit and receive frequencies at one end of the separating means and effective to maintain electrical isolation between the associated transmitter and receiver units while guiding the frequencies to and from the polarization junction means through a common flow path at the other end of the separating means,
- second frequency means for separating the horizontally polarized pair of transmit and receive frequencies of very narrow bandwidth at opposite ends of the 4 to 6 GigaHertz band into separate flow paths for the transmit and receive frequencies at one end of the separating means and effective to maintain electrical isolation between the associated transmitter and receiver units while guiding the frequencies to and from the polarization junction means through a common flow path at the other end of the separating means, and
- wherein the separate flow paths for the transmit and receive frequencies in the first and second frequency separating means are rectangular and have the same internal height and width dimensions so that a single size of waveguide separates the transmit and receive frequencies, and
- coupling means connected between the polarization junction means and the second frequency separating means for guiding the horizontally polarized transmit and receive frequencies between the second frequency separating means and the polarization junction means.
A waveguide apparatus for guiding a first pair of horizontally polarized transmit and receive frequencies independently of and in electrical parallel with a second pair of vertically polarized transmit and receive frequencies between a feed horn and related transmitter or receive units,
- said waveguide apparatus being constructed to operate across the 3.7 to 6.425 GigaHertz band with a very narrow bandwidth for the transmit frequency and a very narrow bandwidth for the receive frequency and with a single size of rectangular waveguide for separating the transmit and receive frequencies,
- said waveguide apparatus comprising,
- polarization junction means connectable to an end of the feed horn and effective to separate the horizontally polarized receive frequency from the vertically polarized receive frequency as the receive frequencies flow from the horn toward the receiver units and effective to guide the separated horizontally and vertically polarized transmit frequencies into joint flow through the common feed horn to the antenna,
- said polarization junction means including a throat, two side ports and septum means in the throat for dividing the E-field of the horizontally polarized receive frequency in two equal parts while turning each of the two parts of the E-field 90 degrees from the direction of flow from the feed horn to a related side port, said septum means being effective to pass the vertically polarized frequencies in a straight line through the throat,
- first frequency separating means for separating the vertically polarized pair of transmit and receive frequencies of very narrow bandwidth at opposite ends of the 3.7 to 6.425 GigaHertz band,
- second frequency separating means for separating the horizontally polarized pair of transmit and receive frequencies of very narrow bandwidth at opposite ends of the 3.7 to 6.425 GigaHertz band,
- each of the first and second frequency separating means comprising,
- a generally Y-shaped waveguide having a leg portion for guiding both the transmit and the receive frequencies, a first branch providing a port for the transmit frequency, a second branch providing a port for the receive frequency, and a junction at which the transmit port, the receive port and the leg portion of the Y-shaped waveguide join together,
- filter means in the receive port only and having band pass structure for passing the receive frequency and band stop structure for stopping the transmit frequency,
- susceptance block means in the transmit port for narrowing down the waveguide, and therefore increasing the cut-off frequency, to prevent receive frequency energy from propagating through the transmit frequency port,
- tuning screws associated with the susceptance block means for providing compensating susceptance to balance out the susceptance introduced by the block means,
- coupling means connected between the ports of the polarization junction means and the second frequency separating means for guiding the horizontally polarized transmit and receive frequencies between the second frequency separating means and the polarization junction means,
- said coupling means including two, symmetrical 180 degree H-plane bends with each bend having a first end connected to a related port of the polarization junction means, two 90 degree E-plane bends and a junction with one end of each E-plane bend connected to an end of a related H-plane bend and with the other end of the E-plane bend connected to the junction, and
- wherein the junction is connected to the leg portion of the second frequency separating means and the leg portion of the first frequency separating means is connected to the throat of the polarization junction and
- wherein all the ports in the Y-shaped waveguides for the first and second frequency separating means are rectangular and have the same internal height and width dimensions.
A frequency separator waveguide apparatus constructed to operate across the 4 to 6 GigaHertz band with a very narrow bandwidth for the transmit frequency and a very narrow bandwidth for the receive frequency and with a single size of rectangular waveguide for separating the transmit and receive frequencies,
- said waveguide apparatus comprising,
- a generally Y-shaped waveguide having
- a leg portion for guiding both the transmit and the receive frequencies,
- a first branch providing a port for the transmit frequency existing in a very narrow bandwidth at one end of the 4 to 6 GigaHertz band,
- a second branch providing a port for the receive frequency existing in a very narrow bandwidth at the opposite end of the 4 to 6 GigaHertz band, and
- a junction at which the transmit port, the receive port and the leg portion of the Y-shaped waveguide join together,
- filter means in the receive port only and having band pass structure for passing the receive frequency and band stop structure for stopping the transmit frequency, and
- wherein each port is rectangular shaped and has the same internal dimensions as each other port and the ratio of the broadwall to the narrow wall of each port equals 2.2.
Dependencies are inferred from the claim text.