SYSTEM AND METHOD FOR WIDEBAND HIGH CURRENT RF CHOKE NETWORK
A high current RF choke network comprising a high current RF choke combined with an all-pass T-bridge filter. The high current RF choke may be connected to a grounded capacitor in the serial branch of the all-pass filter. In this case the parasitic capacitance of the RF choke practically becomes an integral part of the all-pass filter capacitor. The added capacitance in parallel to the parasitic capacitance of the high current RF choke practically neutralizes the resonances of the high current RF choke and thus extends significantly the operating frequency range of the network. The operating frequencies bandwidth range of the high current RF choke network is extended from the legacy range of 5 MHz to 1 GHz up to an extended range of at least 5 MHz to 3 GHz.
1 . An high current RF choke network comprising:
a RF port;
an AC input port;
a RF and AC port;
a ground AC blocker connected to the AC input port at one end and to ground on the other end, the ground AC blocker to block AC signal and to short RF signal to ground;
a choke connected to the AC input port and the ground AC blocker on one end, the choke to enable the AC signal to flow from the AC input port and to block the RF signal;
a line AC blocker connected to the RF port at a first end, the line AC blocker to prevent the AC signal from flowing to the RF port; and
an all pass filter connected a second end of the line AC blocker, to a second end of the choke and to the RF and AC port, the all pass filter to pass the RF signal between the RF and AC port and the RF port, to pass the AC signal from the choke to the RF and AC port, and to neutralize resonance of the choke.
2 . The network of claim 1 , wherein the all pass filter is a T-bridged all pass filter.
3 . The network of claim 2 , wherein the capacitor of a serial branch of the all pass filter is connected in parallel to a parasitic capacitance of the choke.
4 . The network of claim 1 , wherein the AC signal is an up to 20 A and 50 to 60 Hz AC signal.
5 . The network of claim 1 , wherein the RF signal is at least 5 MHz to 3000 MHz signal.
6 . The network of claim 1 , further comprising:
a second RF and AC port;
a second AC input port;
a second ground AC blocker connected to the second AC input port at one end, and to ground on the other end, the second ground AC blocker to block a second AC signal and to short the RF signal to ground;
a second choke connected to the second AC input port and the second ground AC blocker on one end, the second choke to enable the second AC signal to flow from the second AC input port and to block the RF signal; and
a second all pass filter connected at the first end of the line AC blocker, to a second end of the second choke and to the second RF and AC port, the second all pass filter to pass the RF signal between the second RF and AC port and the RF port, to pass the second AC signal from the second choke to the second RF and AC port, and to neutralize resonance of the choke.
7 . The network of claim 6 , wherein the all pass filter and the second all pass filter are a T-bridged all pass filters.
8 . The network of claim 7 , wherein the capacitor of a serial branch of the all pass filter is connected in parallel to a parasitic capacitance of the choke and the capacitor of a serial branch of the second all pass filter is connected in parallel to a parasitic capacitance of the second choke.
9 . The network of claim 6 , wherein the resonance frequency of the all pass filter is different from the resonance frequency of the second all pass filter.