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The periodic half-width microstrip leaky wave antenna (MLWA) with a backward to forward scanning capability is presented in this paper. The proposed antenna consists of a series of half-width MLWA. The radiating periods place on the different sides of the transmission line. The radiating period works in cutoff region of the first higher order mode, the periodic construction radiates the slow wave out along the edge. The experimental results show the main lobe scans electronically and continuously from 149° to 28° in H-plane (y-z plane) toward end fire (+z direction) when the operating frequency increases from 4.2-.9 GHz. [ABSTRACT FROM AUTHOR]

A quasi microstrip leaky-wave antenna (QMLWA) with a two-dimensional (2-D) beam-scanning capability is presented in this paper. QMLWA consists of two half-width microstrip leaky-wave antennas with a phase-shifter. This new type of microstrip leaky-wave antenna has the advantages of reducing size, 2-D beam-scanning and suppressing back lobes. The main lobe scanning in H-plane (y - z plane) is achieved through varying the operating frequency. When the operating frequency increases from 4.4-6 GHz, the main lobe scans from 84° to 26° in H-plane continuously. The main lobe steers in quasi-E-plane with varying the phase difference between two half-width microstrip leaky-wave antennas. The lobe scans from 78° to 103° in quasi-E-plane at 5.4 GHz. The experimental results show this short QMLWA (about 2 wavelengths) leaks power effectively. The back lobe in H-plane of QMLWA is suppressed 13 dB as compared with the conventional whole width MLWA at 5.4 GHz as example. The H-plane radiation characteristics of QMLWA are mainly determined by the width s of half-width MLWA and the distance D between two half-width MLWA together. This size-reduced QMLWA is useful in the automotive radar system and air traffic control. [ABSTRACT FROM AUTHOR]

A novel forward and backward periodic microstrip antenna is presented and tested in this article. The experimental results show that the main lobe scans electronically from 140° to 30° in y–z plane when the operating frequency increases from 3.2 to 8 GHz. The measured results show that the slotted ground plane affects the radiation characteristics of the antenna efficiently. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2608–2610, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25525 [ABSTRACT FROM AUTHOR]