High efficiency transmit-receive switches
High efficiency transmit-receive switches in accordance with embodiments of the invention are disclosed. In one embodiment, a high efficiency transmit receive switch includes a power input coupled to a power supply, an amplifier output port and a transmit switch input port coupled to a circulator, a received signal circuit port coupled to a first PIN diode coupled to a second PIN diode via a first transmission line and spaced a fractional wavelength apart, the transmit switch input port is coupled to a third PIN diode coupled to a harmonic filter, a second transmission line coupled between the second PIN diode and to the third PIN diode, spaced a fractional wavelength apart, the transmit circuit signal port is coupled to an amplifier, the amplifier is coupled to the amplifier output port, the second transmission line is coupled to the bias current generator coupled to the output port.
1. A high efficiency transmit receive switch, comprising:
a transmit switch input port;
a power input;
an amplifier output port;
a transmit switch input port;
a transmit signal circuit port;
a first transmission line;
a second transmission line;
a bias current generator;
an output port;
a received signal circuit port; and
a circulator;
wherein:
the power input is coupled to a power supply;
the amplifier output port and the transmit switch input port are coupled to the circulator;
the received signal circuit port is coupled to a first PIN diode;
the first PIN diode is coupled to a second PIN diode via a first transmission line;
the first PIN diode and second PIN diode are spaced a fractional wavelength apart;
the transmit switch input port is coupled to a third PIN diode;
the third PIN diode is coupled to a harmonic filter;
the second transmission line is coupled between the first PIN diode and the second PIN diode and is coupled to the third PIN diode;
the second PIN diode and the third PIN diode are spaced a fractional wavelength apart;
the transmit circuit signal port is coupled to an amplifier;
the amplifier is coupled to the amplifier output port;
the second transmission line is coupled to the bias current generator;
the bias current generator is decoupled from a harmonic filter by a dc blocking capacitor; and
the harmonic filter is coupled to the output port.
2. The high efficiency transmit receive switch of claim 1 , wherein the circulator is further coupled to a load.
3. The high efficiency transmit receive switch of claim 2 , wherein the circulator dissipates energy received via the amplifier output port using the load.
4. The high efficiency transmit receive switch of claim 1 , wherein the fractional wavelength is a one-quarter fractional wavelength.
5. The high efficiency transmit receive switch of claim 1 , wherein the fractional wavelength is a three-quarter fractional wavelength.
6. The high efficiency transmit receive switch of claim 1 , wherein the first transmission line and the second transmission line are of equal length.
7. The high efficiency transmit receive switch of claim 1 , wherein the amplifier comprises a laterally diffused metal oxide semiconductor amplifier.
8. The high efficiency transmit receive switch of claim 1 , wherein the output port is coupled to a filter.
9. The high efficiency transmit receive switch of claim 1 , wherein the output port is coupled to a lightning arrestor.
10. The high efficiency transmit receive switch of claim 1 , wherein the power supply provides 48V DC.
11. The high efficiency transmit receive switch of claim 1 , wherein the bias current generator provides 0.8 amps of current.
12. The high efficiency transmit receive switch of claim 1 , wherein:
the bias current generator is coupled to a decoupling capacitor and a RF choke; and
the RF choke is coupled to the third PIN diode.
13. The high efficiency transmit receive switch of claim 12 , wherein the RF choke comprises at least one inductor.
14. The high efficiency transmit receive switch of claim 1 , wherein the first PIN diode has a lower power rating than the second PIN diode.
15. The high efficiency transmit receive switch of claim 14 , wherein the first PIN diode has a power rating that is −20 dB lower than the second PIN diode.