Abstract: A phased array antenna includes a plurality of planar panels each having opposing sides and top and bottom edges and forming an antenna face. Each planar panel is disposed circumferentially about a central axis and is connected to adjacent panels along the sides thereof. Each panel is inclined toward the central axis from the bottom edge. A plurality of antenna elements are positioned on each panel. Each panel includes substantially the same number of antenna elements as adjacent panels and forms an antenna array on each antenna face. A plurality of transmit/receive modules generates and receives signals, and each transmit/receive module corresponds to a respective antenna element on an antenna array. Means connects each of the transmit/receive modules to respective pluralities of the antenna elements within each array.

Abstract: An RF transport system delivers a phase-stable RF signal to a load, such as an RF cavity of a charged particle accelerator. A circuit generates a calibration signal at an odd multiple frequency of the RF signal where the calibration signal is superimposed with the RF signal on a common cable that connects the RF signal with the load. Signal isolating diplexers are located at both the RF signal source end and load end of the common cable to enable the calibration to be inserted and extracted from the cable signals without any affect on the RF signal. Any phase shift in the calibration signal during traverse of the common cable is then functionally related to the phase shift in the RF signal. The calibration phase shift is used to control a phase shifter for the RF signal to maintain a stable RF signal at the load.