Design of Periodic Shorting-Vias for Suppressing the Fundamental Mode in Microstrip Leaky-Wave Antennas

Liu, Juhua; Long, Yunliang

doi:10.1109/tap.2015.2459136

Cited by 38 publications

(23 citation statements)

References 21 publications

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“…Microstrip leaky‐wave antennas (MLWAs) [1–15] have received much interest because of their advantages of simple structure, low profile and easy fabrication. A MLWA usually has an ability for beam scanning with frequency, so it can be used in radar system, wireless location and so on.…”

Section: Introductionmentioning

confidence: 99%

“…The mode natures in printed wave‐guiding structures have received extensive investigations [1–23]. In a microstrip line (without shorting vias), the fundamental (EH 0 ) mode is an even bound wave without cutoff, while a higher mode has a cutoff and is a leaky mode near the cutoff [1].…”

Section: Introductionmentioning

confidence: 99%

“…The leaky property in the first or second higher mode has been utilised to design a MLWA. The MLWA working in the first higher (EH 1 ) mode can produce a beam scanning in the vertical plane [1–12], while that working in the second higher (EH 2 ) mode can produce dual symmetrical side beams scanning in the horizontal plane [13–16].…”

Section: Introductionmentioning

confidence: 99%

“…Previously, it was mentioned that shorting vias can be adopted to suppress the EH 0 mode for a MLWA working in the EH 1 mode [3]. In [12], the authors exploited the stop band generated by a set of periodic shorting vias (with a certain large period), to efficiently suppress the EH 0 mode and to enhance the excitation efficiency for the EH 1 mode for a MLWA. In [16], Karmokar et al used closely spaced shorting vias to suppress the EH 0 mode for a MLWA working in the EH 2 mode, and achieved a wide bandwidth with a simple microstrip line feed.…”

Section: Introductionmentioning

confidence: 99%

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Fundamental even leaky mode in microstrip line loaded with shorting vias

Liu

Long

2017

IET Microwaves, Antennas & Propagation

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An even leaky mode in a microstrip line loaded with periodic shorting vias at the centre is investigated. The even leaky mode has a lower cutoff frequency than that of the first higher mode (odd mode). Thus, it is a fundamental leaky mode. The even leaky mode can generate dual symmetrical side beams that scan with frequency, similar to the second higher mode (even mode) in a non‐loaded microstrip line. The dispersion characteristic of the even leaky mode is analysed efficiently with the method of auxiliary sources and validated with HFSS. Based on the leaky even mode, two leaky‐wave antennas with different feeding structures are designed. Measured results for the two antennas are consistent with simulated and theoretical results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fundamental even leaky mode in microstrip line loaded with shorting vias

Liu

Long

2017

IET Microwaves, Antennas & Propagation

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“…SUMMARY Figure 3.22: The current along the antenna with two additional loading wires at MHz. Nowadays, the periodic structure based material is more and more frequently used in the microstrip antenna designs to replace the traditional substrate materials [57][58][59][60]. This material can be used to improve the operating performances of antenna, such as its radiation efficiency, gain, and impedance bandwidth.…”

Section: Discussionmentioning

confidence: 99%

Improvement of antenna performances by using ferrites and periodic structures

Mi¹

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This thesis investigates various methods to improve the performances of antennas. For different applications, the antennas are expected to have corresponding performances and characteristics. The efficiency is one of the most important parameters that should be considered, and the losses determine the efficiency directly. For different types of antennas operating in different frequency bands, there exist different factors which influence the performances. For example, in the HF band (3 MHz-30 MHz), the performances depend on the mismatch loss and the size of the antenna. In the microwave frequency band, besides the mismatch loss, the dielectric loss of the substrate material is also one of the most important factors. Whereas in the millimeter wave frequency band, the loss in the feeding network is the factor that limite antenna gain and efficiency when the sub-antennas are all matched well. Considering various influence factors, different techniques and methods are investigated to improve the performances. First, the compact and effective ferrites are selected to improve the performances of the HF antennas. Effective methods of using ferrites are proposed to improve the performances of the HF antenna. By analyzing the current in the ground plane of the antenna, the

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A tunable ⵣ‐shaped microstrip leaky wave antenna based on liquid crystal

Soad

2022

Int J Communication

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This article presents an electrically tunable dual-beam ⵣ-shaped microstrip leaky wave antenna (MLWA) based on liquid crystal (LC). A new ⵣ-shaped microstrip component (Berber's alphabet: pronounced jzj) is proposed as a single unit-cell to achieve a dual-beam radiation pattern with adjustable dualbeam angles controlled by the ⵣ-shaped length-to-width ratio. The dual-beam radiation pattern of ⵣ-shaped microstrip is theoretically derived. The tunable dual-beam scanning is achieved using a nematic liquid crystal (N-LC). An AC voltage controls the permittivity of N-LC applied on the inverted radiating metal. The orientation angle of the N-LC molecules is also determined theoretically. Besides, the MLWA is rearranged due to the meandering configuration of its microstrip transmission lines, which reduces the antenna's size. As a result, this antenna has a symmetrical dual-beam at a pointing angle of ±37 in the YZ-plane. Furthermore, the proposed MLWA is tuned up to 25 at a fixed frequency in XZ-plane directions by applied AC voltage from 0 to 20 V, which changes the permittivity of the N-LC from 2.47 to 3.25, respectively. Meanwhile, the MLWA has a realized gain of up to 7.5 dB and a beam scanning range of 40 in the XZ-plane for all operating frequencies. Finally, the proposed antenna can be suitable for satellite and radar communication systems.

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Design of Periodic Shorting-Vias for Suppressing the Fundamental Mode in Microstrip Leaky-Wave Antennas

Cited by 38 publications

References 21 publications

Fundamental even leaky mode in microstrip line loaded with shorting vias

Fundamental even leaky mode in microstrip line loaded with shorting vias

Improvement of antenna performances by using ferrites and periodic structures

A tunable ⵣ‐shaped microstrip leaky wave antenna based on liquid crystal

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