The most recent relay in this series is the model G9YA, a 26.5 GHz coaxial relay
designed primarily for mobile communications base station and antenna applications.
Higher frequencies are supported through a range of coaxial relay
solutions from DC to 6 GHz and upwards to 65 GHz."
For applications that need a much higher level of isolation, Universal Switching's Series 70000 and RS70000 coaxial relay
assemblies are available in configurations from 1x2 up to 1x24.
For example, a coaxial relay
can have very high-frequency operation with excellent insertion loss and power handling.
Type of Switch Coaxial PIN Diode GaAs Low-Power Low-Power Monolithic Switching Speed 1 to 20 ms 1 to 200 ns 1 to 200 ns Frequency Range DC to 40 GHz >Octave >Octave Insertion Loss 0.05 to 0.8 dB 0.8 to 2.0 dB 0.8 to 2.0 dB Isolation 80 to 110 dB 4 to 80 dB 40 to 80 dB VSWR 1.1 to 1.5 1.5 to 2.0 1.5 to 2.0 Relative Cost 1x 2x to 10x 2x to 10x Table 1 RF and Microwave Switch Technology Comparison Courtesy of Dow-Key Microwave As the table shows, nothing compares to an electromechanical coaxial relay
for frequency range, insertion loss, and isolation.
To go very much higher in frequency than a few gigahertz and achieve good loss and isolation performance, a coaxial relay
And, at microwave frequencies, bulky coaxial relays
are used, which reduce circuit density even more.
Because reed, electromechanical (EM), and coaxial relays
all have moving parts, they wear out mechanically.
Very high bandwidths can be achieved using coaxial relays
, a subgroup within the overall EM classification.
Not surprisingly, relatively large armature relays handle power switching at low frequencies, smaller reed relays or FET and solid-state switches are used for general-purpose applications up to a few hundred megahertz, and conventional, large coaxial relays
are found at RF and microwave frequencies.
For example, coaxial relays
perform the basic circuit make/break function but do so while maintaining a constant characteristic impedance.