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A novel millimeter wave monopulse slotted waveguide array antenna with a central hole for infrared sensor use is presented. The amplitude distribution is optimized, and a monopulse comparator is designed to feed the proposed array. This millimeter wave array antenna has been fabricated and measured. The gain of the sum beam is higher than 32dB, whereas the zero depth of the difference beam is lower...
This paper describe a novel design of dual band monopulse antenna array, which is made of a X-band and a K-band in the same planar radiating surface. The K-band array is the traditional waveguide slot antenna, which is interfaced to the X-band antenna. The simulated and measured radiation patterns at center frequency are both presented. The side-lobe level for the sum pattern of two frequency are...
A novel compact slot patch antenna with two spirals on single thin substrate is introduced, which is 66% smaller than the conventional half-wave patch antenna. The four parallel slots on surface can enhance the length of current path and reduce the size of patch, the two spirals used can decrease the height of antenna at the same tme. Good agreement between the theoretical and experimental results...
A new slotted rectangular waveguide array antenna is introduced, which is constructed on the conformal cylindrical surface. Unlike other slotted waveguide arrays, this array has a beam with a large tilt angle from the broadside of the linear array. The array consists of a waveguide with inclined slots cutting in the narrow wall and a matching load at one end for the traveling wave operation. The antenna...
A novel compact slot patch antenna loaded with a pair of spirals on thin substrate is introduced, which is 66% smaller than the conventional half-wave patch antenna. The effects of four parallel slots on surface current distribution and loading spirals on impedance matching are all investigated theoretically respectively. Good agreement between the theoretical and experimental results is obtained...
A novel microstrip slot antenna backed by a ground plane with a U-shaped feed is presented. Based on the simulation, its impedance bandwidth for VSWRs ≤ 2 covers the range of 5.3 to 18.5 GHz, whose relative bandwidth reaches 110.9%. In addition, the good gain performance is achieved. These features make it an attractive canditate for a compact portable terminal in the personal, mobile satellite and...
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