Model analysis of coupled‐mode leaky‐wave antenna for forward and backward frequency scanning

Abstract

This article proposes model analysis of a microstrip leaky‐wave antenna for forward and backward scanning. Mode coupling and dual scan concept is introduced in this article with an inverted V‐section leaky‐wave antenna. The proposed design concept has been implemented on microstrip planar structure. An inverted V‐section has been therefore implemented which resulted in frequency scanning in forward and backward directions in the right‐hand (RH) region. The phenomenon has been observed within same frequency bandwidth of leaky‐wave region which is normally difficult to see in conventional leaky‐wave antennas. The article has also provided a circuit model analysis and design implementation explained by mode coupling theory. The proposed dual scanning leaky‐wave antenna (DSLWA) design is providing a wide impedance bandwidth in the Ku‐band and K‐band with high gain, reduced side lobe levels and high radiation efficiency.

On Decomposition-Based Surrogate-Assisted Optimization of Leaky Wave Antenna Input Characteristics for Beam Scanning Applications

“…Thus, the proposed method can be used not only for computationally efficient surrogate modelling but it can also be used to realize stop band suppression within the limits of unit element and array design for the selected operation bands. Furthermore, Table 5 provides performance comparison with state-of-the-art designs [19], [39][40][41][42][43][44][45][46][47][48]. As it can be observed, although the radiation performance of the considered LWA is inferior compared to some of the designs reported therein, it should be noted that the size of the array of Fig.…”

Symmetric periodic leaky‐wave antenna for open stopband suppression

“…Leaky‐wave antennas (LWAs) are attractive due to some desirable properties like high directivity and radiation beam scanning capability with frequency 1,2 . In literature, various LWAs have been reported, such as planar periodic leaky‐wave antennas (P‐LWAs), 3–6 Substrate integrated waveguide (SIW) based LWAs, 7–9 Composite right/left‐handed (CRLH)‐transmission line based LWAs, 10–12 dielectric image line based LWAs, 13,14 and spoof surface plasmon‐based LWAs 15,16 . The propagation constant ( γ ) plays a key role in the analysis and design of an LWA.…”

Realization of Low Profile Leaky Wave Antennas Using the Bending Technique for Frequency Scanning and Sensor Applications

“…These antennas may contain two CRLH bands along with a new right-handed (RH) band in between. In our previous work [17], a modified lossy transmission line model has already been developed to analyze and to synthesize non-uniform leaky wave antennas where a forward and reverse frequency scanning has been achieved in the right-hand quadrant, but not in the left-hand region.…”

“…With the help of a truncated superstrate, another leaky wave-based dual-band phased array has been achieved for on-board satellite communications with the bandwidth extended for use in the K-band (17.7–20.2 GHz) and the Ka-band (27.5–30 GHz) [17]. Some leaky wave antenna designs have been proposed recently for Ku-band applications, but are mostly based on substrate integrated waveguides.…”

“…These designs have achieved good antenna performance, but at the expense of increased fabrication costs and design complexity. Furthermore, this is to point out that very limited research has been done on microstrip leaky wave antennas in the Ku-frequency band [15,16,17,18,19,20,21,22,23,24,25,26]. In this work, the sharpness of the bends along the body of a microstrip transmission line is advantageously used to realize a fundamentally different leaky wave antenna with a broadband impedance matching and high gain characteristics in the Ku-band.…”