Dual band quadpack transmit/receive module

1. A multi-channel, dual-band, radio frequency (RF) transmit/receive (T/R) module, comprising:

a compact, RF manifold connector; and

at least four T/R channels, each including:

a notch radiator,

a diplexer with an input port coupled to the notch radiator, an upper-band port and a lower-band port,

a power amplifier, including at least one dual-band gain stage, coupled to the notch radiator,

a low noise amplifier, including n lower-band gain stages arranged in series and coupled to the lower-band port of the diplexer and m upper-band gain stages arranged in series and coupled to the upper-band port of the diplexer, where m is greater than n, and

a T/R cell, including a phase shifter, a signal attenuator and at least one dual-band gain stage, coupled to the power amplifier, the low noise amplifier and the manifold connector.

2. The T/R module of claim 1 , wherein the lower-band is Ku-band and the upper-band is Ka-band.

3. The T/R module of claim 2 , wherein the diplexer is approximately 0.28 inches in length, 0.16 inches in width and 0.03 inches in height.

4. The T/R module of claim 2 , wherein the diplexer includes:

an input port coupled to the notch radiator;

a Ku-band output port coupled to the lower-band gain stage of the low noise amplifier; and

a Ka-band output port coupled to the upper-band gain stage of the low noise amplifier.

5. The T/R module of claim 4 , wherein the diplexer includes a low-pass filter coupled to the input port and the Ku-band output port, and a high-pass filter coupled to the input port and the Ka-band output port.

6. The T/R module of claim 5 , wherein the low-pass filter is a rectangular waveguide and the high-pass filter is a stripline waveguide.

7. The T/R module of claim 5 , wherein the low-pass filter and the high-pass filter are separated by grounding walls that include ground plane vias.

8. The T/R module of claim 5 , wherein the low-pass filter has a cutoff frequency of approximately 20 GHz, and the high-pass filter has a cutoff frequency of approximately 28 GHz.

9. The T/R module of claim 2 , wherein the power amplifier dual-band gain stage includes at least one lower-band gain stage and at least one upper-band gain stage.

10. The T/R module of claim 9 , wherein the T/R cell dual-band gain stage includes at least one lower-band gain stage and at least one upper-band gain stage.

11. The T/R module of claim 1 , wherein the power amplifier includes high electron mobility transistors or pseudomorphic high electron mobility transistors.

12. The T/R module of claim 11 , wherein the low noise amplifier includes high electron mobility transistors or pseudomorphic high electron mobility transistors.

13. The T/R module of claim 2 , wherein the T/R channels are configured to transmit Ka and Ku band signals simultaneously.

14. An active electronically scanned array, comprising:

a beam steering computer;

a manifold coupled to the beam steering computer; and

a plurality of multi-channel, dual-band, radio frequency (RF) transmit/receive (T/R) modules, coupled to the manifold and arranged in a two-dimensional array, each module including:

a compact, RF manifold connector; and

at least four T/R channels, each channel including:

a notch radiator,

a diplexer, including an input port coupled to the notch radiator, a Ku-band output port coupled to a lower-band gain stage of a low noise amplifier with n gain stages arranged in series, a Ka-band output port coupled to a upper-band gain stage of the low noise amplifier with m gain stages arranged in series, where m is greater than n, a low-pass filter coupled to the input port and the Ku-band output port, and a high-pass filter coupled to the input port and the Ka-band output port,

a power amplifier, coupled to the notch radiator, including at least one Ku/Ka band gain stage,

a low noise amplifier, including at least one Ku-band gain stage and at least one Ka-band gain stage, coupled to the diplexer, and

a T/R cell, including a phase shifter, a signal attenuator and at least one Ku/Ka-band gain stage, coupled to the power amplifier, the low noise amplifier and the manifold connector.

15. The array of claim 14 , wherein the low-pass filter is a rectangular waveguide, the high-pass filter is a stripline waveguide and the low-pass and high-pass filters are separated by grounding walls that include ground plane vias.

16. The array of claim 14 , wherein the low-pass filter has a cutoff frequency of approximately 20 GHz, and the high-pass filter has a cutoff frequency of approximately 28 GHz.

17. The array of claim 14 , wherein the power and low noise amplifiers include high electron mobility transistors or pseudomorphic high electron mobility transistors.

18. The array of claim 14 , wherein the T/R channels are configured to transmit Ka and Ku band signals simultaneously.

19. The T/R module of claim 1 , wherein there are two lower-band gain stages and three upper-band gain stages.

20. The T/R module of claim 1 , wherein the compact, RF manifold connector is no higher than the height of the T/R module.

21. The active electronically scanned array of claim 14 , wherein there are two lower-band gain stages and three upper-band gain stages.

22. The active electronically scanned array of claim 14 , wherein the compact, RF manifold connector is no higher than the height of the T/R module.