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. A high current RF choke network comprising:
an RF port;
a first AC input port;
a first RF and AC port;
a first ground AC blocker connected to the first AC input port at one end and to ground on the other end, the first ground AC blocker configured to block an AC signal and configured to short circuit an RF signal to ground;
a first choke connected to the first AC input port and the first ground AC blocker on one end, the first choke configured to enable the AC signal to flow through the first choke from the first AC input port and configured to block the RF signal;
a line AC blocker connected to the RF port at a first end, the line AC blocker configured to prevent the AC signal from flowing to the RF port; and
a first all pass filter connected to a second end of the line AC blocker, connected to a second end of the first choke and connected to the first RF and AC port, the first all pass filter configured to pass the RF signal between the first RF and AC port and the RF port, configured to pass the AC signal from the first choke to the first RF and AC port, and configured to neutralize resonance of the first choke in the frequency range of 5 MHz to 3 GHz.
2. The network of claim 1 , wherein the first all pass filter is a T-bridged all pass filter.
3. The network of claim 2 , wherein the first all pass filter comprises a serial branch including a capacitor; and the capacitor of the serial branch of the first all pass filter is connected in parallel to a parasitic capacitance of the first choke.
4. The network of claim 1 , wherein the AC signal comprises a current no more than 20 A and a frequency between 50 to 60 Hz.
5. The network of claim 1 , the frequency range of the RF signal is at least 5 MHz to 3000 MHz.
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 configured to block a second AC signal and configured to short circuit 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 configured to enable the second AC signal to flow through the second choke from the second AC input port and configured to block the RF signal; and
a second all pass filter connected at the first end of the line AC blocker, connected to a second end of the second choke and connected to the second RF and AC port; the second all pass filter configured to pass the RF signal between the second RF and AC port and the RF port, configured to pass the second AC signal from the second choke to the second RF and AC port, and configured to neutralize resonance of the second choke in the frequency range of 5 MHz to 3 GHz.
7. The network of claim 6 , wherein the first all pass filter and the second all pass filter are T-bridged all pass filters.
8. The network of claim 7 , wherein the first all pass filter and the second all pass filter each comprise a serial branch including a capacitor; the capacitor of the serial branch of the first all pass filter is connected in parallel to a parasitic capacitance of the first choke and the capacitor of the 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 first all pass filter is different from the resonance frequency of the second all pass filter.