Isometric perspective drawing of a signal base station and a smartphone, the base station is a truss communication tower with a spherical signal transmitter on top, the smartphone is a flat rectangular touch screen style, connected by blue light. Scene: deep dark blue virtual network communication space, background distributed with tiny light spots simulating digital universe, the base station has a circular diffusing halo at the bottom. Style: flat vector tech illustration style, isometric 3D perspective effect, no realistic physical texture, completely abstract tech visual expression. Color palette: dominated by different shades of blue, paired with bright cyan blue as highlights, overall cool tone, with electronic luminous visual effect. Lighting: overall self-illuminating soft halo effect, signal lines emitted by the base station, the circular halo at the base station bottom, and the circular ripples at the center of the smartphone screen all have soft glow, no shadows from real light sources, volume and hierarchy are distinguished only by brightness. Composition: balanced composition with center-left layout, the signal base station is located at lower left of the picture, the smartphone is at upper right of the picture, connected by a diagonal line forming a stable visual flow, simple and clear layout, highlighting the connection between the two. Purpose: used for tech promotional materials expressing mobile communication technology, wireless network connection, 5G and other data transmission-related themes, suitable as illustrations for tech content.