Bypass device for a microwave amplifier unit, the microwave amplifier unit configured to extend between an input port and an output port and to amplify communication signals in at least one microwave frequency band above 500 MHz, and comprising at least one low noise amplifier and switching elements (9, 10, 16, 21), wherein the bypass device comprises a bypass segment and is configured to: extend in parallel to said microwave amplifier unit between said input port and said output port, be activated by said switching elements in a bypass mode of the bypass device in case said amplifier unit becomes inoperable and be blocked by said switching elements in an active mode of the bypass device, said bypass segment comprising a series of bypass segment sections (14,19,17) having at least one junction point between them configured to be connected to an associated one of said switching elements (16,21), characterized in, that: each of said bypass segment sections (14,19,17) comprises at least two transmission lines (31,32,33, 34; 41,42, 43, 44;51,52,53), configured to be coupled in different ways and form different sets (31-32, 31-34-32, 31-33-32; 51-52, 51-53-52; 42-41, 42-44-41, 42-43-41) of transmission lines; the sets of coupled transmission lines are configured to be in use only one at a time for each of said bypass segment sections, and each set of coupled transmission lines is configured to optimize the bypass segment to a different operating frequency, whereby the bypass segment is configured to be able to operate properly in the bypass mode at more than one frequency. extend in parallel to said microwave amplifier unit between said input port and said output port, be activated by said switching elements in a bypass mode of the bypass device in case said amplifier unit becomes inoperable and be blocked by said switching elements in an active mode of the bypass device, said bypass segment comprising a series of bypass segment sections (14,19,17) having at least one junction point between them configured to be connected to an associated one of said switching elements (16,21), characterized in, that: each of said bypass segment sections (14,19,17) comprises at least two transmission lines (31,32,33, 34; 41,42, 43, 44;51,52,53), configured to be coupled in different ways and form different sets (31-32, 31-34-32, 31-33-32; 51-52, 51-53-52; 42-41, 42-44-41, 42-43-41) of transmission lines; the sets of coupled transmission lines are configured to be in use only one at a time for each of said bypass segment sections, and each set of coupled transmission lines is configured to optimize the bypass segment to a different operating frequency, whereby the bypass segment is configured to be able to operate properly in the bypass mode at more than one frequency. each of said bypass segment sections (14,19,17) comprises at least two transmission lines (31,32,33, 34; 41,42, 43, 44;51,52,53), configured to be coupled in different ways and form different sets (31-32, 31-34-32, 31-33-32; 51-52, 51-53-52; 42-41, 42-44-41, 42-43-41) of transmission lines; the sets of coupled transmission lines are configured to be in use only one at a time for each of said bypass segment sections, and each set of coupled transmission lines is configured to optimize the bypass segment to a different operating frequency, whereby the bypass segment is configured to be able to operate properly in the bypass mode at more than one frequency.