Abstract
A novel fixed-frequency beam switchable dual-beam antenna array is presented, which consists five dual-beam leaky-wave antenna (LWA) elements designed on substrate integrated waveguide (SIW) and integrated together on a common substrate. The LWAs work on fundamental wave and −1th spatial harmonic wave simultaneously and excite two symmetrical radiation beams in forward and backward direction respectively. In order to realize beam switching, three voltage-driven radio frequency chip switches (CSW-RFs) are used and integrated behind the antenna aperture. Since the periodic slot in LWA causes open stopband at the operating frequency, so the staggered radius amplification of local vias in the via walls of SIW is performed to suppress the open stopband. In addition, electromagnetic band-gap (EBG) structures, capable of reducing coupling between neighboring antenna elements, are embedded in between LWAs. The proposed dual-beam antenna array with beam switching capability between ±35, ±45, ±55, ±65 and ±75 degrees at 28 GHz are simulated, fabricated and measured. Both analysis and measurement results show that the proposed antenna array exhibits an excellent performance, which can be used in fixed-frequency beam-switching millimeter wave communication.
Highlights
As one typical type of traveling-wave antenna, leaky-wave antenna (LWA) based on substrate integrated waveguide (SIW) exhibits excellent advantages, such as high directivity, low profile and inherent frequency scanning capability [1], [2], and has been applied in various communication systems, especially for the beam-steering or patternreconfigurable applications [3]–[5], [6]–[9]
In [20], a dual-beam SIW LWA is proposed based on the orthogonal excitation of TE10 and TE01 modes which radiate through the top wall and lateral wall of waveguide respectively, so two radiation beams are generated
SUPPRESSION OF THE OPEN STOPBAND From above analysis, we find that for a LWA with symmetrical dual-beam radiation pattern, the slots spacing is equal
Summary
As one typical type of traveling-wave antenna, leaky-wave antenna (LWA) based on substrate integrated waveguide (SIW) exhibits excellent advantages, such as high directivity, low profile and inherent frequency scanning capability [1], [2], and has been applied in various communication systems, especially for the beam-steering or patternreconfigurable applications [3]–[5], [6]–[9]. As early as 1997, a dual-beam microstrip leaky-wave antenna (MLWA) using central fed CPW to excite the highorder mode is proposed, which makes energy leak in two directions to form dual beam [10]. In [20], a dual-beam SIW LWA is proposed based on the orthogonal excitation of TE10 and TE01 modes which radiate through the top wall and lateral wall of waveguide respectively, so two radiation beams are generated. In [21], the original metal vias on both side walls of SIW are replaced by metal blocks with large spacing, so dual-direction energy leakage is generated and two beams in H-plane are excited.
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