Configuration of transmit/receive switching in a transceiver

A transmit/receive switch adapted to selectively switch an antenna connection at an antenna port to either a transmitter port or a receiver port, comprising:

• a first RF switch;
• said first RF switch having a conducting state and a non-conducting state;
• a first conductive RF switch connection node connected to said first RF switch;
• a conductive transmitter connection node connected to the transmitter port;
• a conductive receiver connection node connected to the receiver port;
• a conductive antenna connection node connected to the antenna port;
• a first transmission line segment connected between said transmitter connection node and said antenna connection node and having a first selected length approximately equal to an odd number of quarter wavelengths,
• a second transmission line segment connected between said receiver connection node and said antenna connection node and having a second selected length approximately equal to an odd number of quarter wavelengths,
• a third transmission line segment connected between said transmitter connection node and said first RF switch connection node and having a third selected length approximately equal to an odd number of quarter wavelengths;
• said first RF switch, when in said conducting state, effectively grounding said first RF switch connection node, thereby providing an open circuit impedance at said transmitter connection node through said third transmission line segment.

An economical, compact, transmit/receive “RF in” switching component, comprising;

• a transmitter output connection node and an antenna connection node;
• a first transmission line segment connected between said transmitter connection node and said antenna connection node and having a first selected electrical length of approximately one quarter wavelength;
• a first semiconductor circuit element having control input node and a conducting state and a substantially non-conducting state and having a first semiconductor circuit element connection node;
• a second transmission line segment connected between said transmitter connection node and a first semiconductor circuit element connection node;
• said transmit/receive switch further comprising a third transmission line segment connected between said first semiconductor circuit element connection node and a grounded node and having a selected electrical length less than one quarter wavelength;
• and
• said first semiconductor circuit element being selectively operable to effectively ground said third transmission line segment at said first semiconductor circuit element connection node when in said conducting state, in response to receiving a control signal on said control input node.

An economical, compact, transmit/receive “RF out” switching component, comprising;

• a receiver input connection node and an antenna connection node;
• a first transmission line segment connected between said receiver input connection node and said antenna connection node and having a first selected electrical length of approximately one quarter wavelength;
• a first semiconductor circuit element having control input node and a conducting state and a substantially non-conducting state and having a first semiconductor circuit element connection node;
• said first semiconductor circuit element connection node being connected to said receiver input connection node;
• a second transmission line segment connected between said receiver input connection node and a grounded node and having a selected electrical length less than one quarter wavelength;
• and
• said first semiconductor circuit element being selectively operable to effectively ground said second transmission line segment at said first semiconductor circuit element connection node when in said conducting state, in response to receiving a control signal on said control input node.