A modular trade show booth includes a plurality of frame structures connected to form a floor support frame, a first wall support frame and a second wall support frame. The base station apparatus and the mobile station apparatus communicate with each other such that each of multiple uplink carrier components corresponds to each of multiple downlink carrier components or multiple downlink carrier component groups including multiple downlink carrier components. Two of terminals of the second terminal set are located at two opposite sides of the pair of first differential signal terminals, and another two of the terminals of the second terminal set are located at two opposite sides of the pair of second differential signal terminals. To assure turn-on of the multiple elements of the array the emitter fingers are continuously or contiguously connected with an unique emitter design layout. Moreover, a rotary transducer may be equipped with this angle-of-rotation sensor.