Abstract
This paper proposed a one-dimensional beam scanning transmitarray lens antenna fed by a microstrip linear array antenna which owns a wide pattern in the plane orthogonal to the array axis and a narrow pattern in the plane that includes the array axis. The design principle of transmitarray lens aims to modulate a fan beam into a pencil beam by compensating phase shift of the linear array on the plane orthogonal to the array axis at X band. First, the Rotman lens feed network is used to implement nearly ±40° one-dimensional beam scanning for the linear array with 1 × 8 microstrip antenna elements. Then, a lowprofile transmitted element with only one-layer of the substrate is utilized to design the new transmitarray lens, which can reduce fabrication expense and difficulties. After adding the transmitarray lens, maximum gain increments of 7.81 and 7.65 dB in simulation and measurement can be obtained in quasi-boresight directions, and gain increment could be obtained within ±25° beam scanning range. Besides, the fan beams of the original linear array are smoothly transformed into pencil beams.
Highlights
Long distance wireless communications such as satellite, radar and deep space exploration cannot work without high gain antennas
From equation (1) we can see that the broadside linear array in Fig.1 has a wide pattern in YOZ plane and a narrow pattern in XOZ plane where one-dimensional beam scanning can be realized by assigning phase shift of Pn= nk0dx u0
As is well-known, Rotman lenses are an attractive method to feed line array sources and they enable one-dimensional beam scanning with low phase-aberrations over a wide scanning angular range. It is designed based on geometrical optics approach (GO), and a typical configuration of Rotman lens is presented in Fig.2 (a) from which we can see that the inner-lens contour is connected to the input ports with transmission lines, linking outer-lens contours to the linear
Summary
Long distance wireless communications such as satellite, radar and deep space exploration cannot work without high gain antennas. Another type of transmitarray can be classified as transmitter-receiver form [6]–[8] which employs transmission line structure for obtaining accurate phase shift Both types of transmit array are composed of at least three layers of PCB which greatly increase the profile and computing resource when designing the high gain transmitarray antenna. They could not satisfy the demand for high-power field application such as high-power radar, impulse radar and guided missiles, et al This is because feed source with single channel can only transmit limited power into the space Under this circumstance, inspiration of a tradeoff scheme becomes increasingly clear which is combination of a linear array antenna and a planar transmitarray for generation of high-gain pencil beams. Transmitarray onto broadside linear array, and gain increment could be obtained within ±25◦ beam scanning range
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