Low-loss duplexer without settings

A duplexer for microwave signals comprising:

• two passband filters for processing incoming signals and outgoing signals, respectively, and to process these signals simultaneously, the filters having:
• a monolithic block;
• two tunnels that open jointly at one end by a common part into a first hole and open independently at the other end into a second hole and third hole, each tunnel including a longitudinal passage, and compartments demarcated by transversal partition walls, the compartments, the longitudinal passages and the common parts are hollowed out in the upper plane face of the monolithic block;
• and
• a lid that adheres uniformly to the upper plane surface, the lid for the tunnels being closed at the top from the first hole up to the second and third holes;
• the functional characteristics of the two filters being determined by dimensional parameters within the tunnels;
• the monolithic block and the lid are made of an aluminum alloy;
• a joining surface of the lid is covered with a uniform layer of a brazing alloy to obtain uniform adhesion on all the surfaces in contact with the monolithic block and with the lid after soldering;
• and
• the brazing alloy comprises 60% of tin and 40% of lead.

A duplexer for microwave signals comprising:

• two passband filters for processing incoming signals and outgoing signals, respectively, and to process these signals simultaneously, the filters having:
• a monolithic block;
• two tunnels that open jointly at one end by a common part into a first hole and open independently at the other end into a second hole and third hole, each tunnel including a longitudinal passage, and compartments demarcated by transversal partition walls, the compartments, the longitudinal passages and the common parts are hollowed out in the upper plane face of the monolithic block;
• and
• a lid that adheres uniformly to the upper plane surface, the lid for the tunnels being closed at the top from the first hole up to the second and third holes;
• the functional characteristics of the two filters being determined by dimensional parameters within the tunnels;
• the monolithic block and the lid are made of an aluminum alloy;
• a joining surface of the lid is covered with a uniform layer of a brazing alloy to obtain uniform adhesion on all the surfaces in contact with the monolithic block and with the lid after soldering;
• and
• at least a surface inside the tunnels of the monolithic block are subjected to surface treatment to ensure the efficient transmission of the signals in the tunnels.