miniaturization of devices. In 2013, Shen et al. proposed a planar SPP waveguide with ultrathin and flexible properties. [9] Subsequently, nearly perfect conversions from spatial to SPP modes are introduced to realize high-efficiency transmissions of spoof SPPs. [10] Spoof SPPs not only possess the property of natural SPPs with field enhancement but also have their advantages, including low loss, low crosstalk, easy integration, and miniaturization. The electromagnetism physical properties of the spoof SPP device can be designed by tuning geometrical parameters. Thus, a large number of passive devices based on spoof SPPs have been reported utilizing the advantage of spoof SPP waveguide, such as filters, couplers, power dividers, and antennas. [11][12][13][14][15][16][17][18][19][20][21] Additionally, the hybrid circuits based on substrate integrated waveguide (SIW) and spoof SPP waveguide have been reported because SIW has some advantages of the significant reduction in cost, loss and radiation, and easy integration. [22,23] For passive metamaterials, their functionalities are fixed after the fabrication, which severely limits the practical values. To freely control EM waves, digital coding and programmable metamaterials are adopted in microwave frequency. [24][25][26][27][28][29][30][31] Recently, the concepts of reconfigurable and programmable of spoof plasmonic metamaterials have been proposed. Based on the reconfigurable spoof SPPs, some devices with adjustable frequency and nonlinear phenomena are realized. [32][33][34][35][36][37] Further than that, three different digital-analog functionalities can be realized by coding representation in a simple programmable system, [38] and a dual-channel spoof SPP logic "AND" gate was proposed by programming controlled of multiple modes of spoof SPPs. [39] In this work, a three-port programmable hybrid circuit is proposed and investigated, which consists of two spoof SPP waveguides loaded with the varactor diodes and the SIW. By manipulating the dispersion behaviors, EM waves only can propagate with operating frequencies lower than the cutoff frequency of the SPP waveguide but higher than that of SIW. The proposed three-port waveguide can realize the functionalities of the power division and the filtering around X-band, even Ku-band, while the corresponding transmission for the power division is around −4 dB in whole operating frequency bands. Besides, a logic "OR" gate with 2-bit coding can also A programmable hybrid circuit is proposed, which is composed of two reconfigurable spoof surface plasmon polariton (SPP) waveguides loaded with varactor diodes and a substrate integrated waveguide (SIW). By manipulating their dispersion behaviors, the band-pass effect is achieved in the hybrid circuit, in which the upper and lower cutoff frequencies are determined by the SPP waveguide and SIW, respectively. When two SPP waveguides are configured to have the same cutoff frequency that is higher than the SIW's cutoff, the proposed circuit can realize a power division; when one SP...