A novel wideband design of a Ka-band compact dual polarized horn is presented. In order to suppress multimode affection, a novel multimode conical horn replaces conical horn. The simulated 10dB return loss bandwidth is approximately 15.6% (ranging from 29.5 to 34.5GHz). The simulated insertion loss of the orthomode transducer is less than -0.15dB, the isolation less than -55dB, and the VS WR is less than 1.3 in the operating frequency (ranging from 31 to 33GHz). This structure has properties of not only a wide band, ultra-low insertion loss and high isolation, but also good impedance match, small size, and radiation pattern. A prototype has been manufactured and measured. S ince the simulated results are consisted with the measured ones, this novel compact structure has enormous potential for the dual polarized antenna.

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Measuring control delay at signalized intersections accurately is very important for designing and operating traffic control systems. At present, we usually maintain control delay through observing on the spot or model calculating. However, the control delays obtained by these methods are not accurately and in real time. In the recent years, the development of vehicle infrastructure integration system provides us a truly integrated transportation system. In this system, every moving vehicle equipped with onboard equipment is also a moving sensor, which can collect traffic information and transmit traffic information to road-side equipments in real time. Using this information, this paper advances a new method of control delay measuring based on vehicle infrastructure integration system and also confirm the effectiveness of the measuring method through traffic simulation.

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