Aiming at the development requirement miniaturization of radio frequency（ RF） devices

a novel RF micro-electro-mechanical-system（ MEMS） single-pole four-throw（ SP4 T） switch with low insertion loss and high isolation is proposed

which is cascaded with a K-type splitter and four single-pole single-throw switch

.Among them

the K-type power divider design is composed of one input terminal

four output terminals and a disc-shaped structure.The results show that the insertion loss of the single-pole four-throw switch is ≤0.41 d B

the isolation is≥21 d B

the driving voltage is 12.4 V and the RF performance is stable throughout DC-20 GHz frequency band

the fluctuation amplitude is small

and the linearity is high.The overall size of the K-type single-pole four-throw switch designed in this paper is 2.11 mm × 1.6 mm × 0.6 mm

which has more potential applications in the miniaturized wireless communication system of L ～ Ku（ 1 ～ 18 GHz） band.