PMI Model No. P1T-500M18G-80-R-SFF-SW21841A is a 0.5 to 18.0 GHz Single Pole, Single Throw, Reflective Switch that offers a maximum insertion loss of 2.5 dB with a maximum VSWR of 1.9:1 and a minimum isolation of 80 dB.   Housing measures 0.792" x 1.970" x 0.530" and has SMA female connectors.  https://www.pmi-rf.com/product-details/p1t-500m18g-80-r-sff-sw21841a