Coplanar waveguide to coplanar strips-fed active leaky-wave antenna

Hu, Cheng-Chi; Jou, Christina F.; Wang, Chien-Jen; Lee, Shing-Horng; Wu, Jin−Jei

doi:10.1002/(sici)1098-2760(19981205)19:5<335::aid-mop7>3.0.co;2-f

Cited by 5 publications

(3 citation statements)

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“…Antennas are vital in wireless communication, transmitting and receiving electromagnetic waves [ 1 , 2 , 3 , 4 , 5 , 6 ]. Different applications require various antenna functionalities, among which beam scanning performance is crucial to the system function [ 7 , 8 , 9 , 10 ]. Since the 1940s, the leaky-wave antenna has garnered significant attention due to its exceptional radiation characteristics and impressive beam scanning capability [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

MCML-BF: A Metal-Column Embedded Microstrip Line Transmission Structure with Bias Feeders for Beam-Scanning Leakage Antenna Design

Hou,

Fang,

Fan

et al. 2024

Sensors

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This article proposes a novel fixed-frequency beam scanning leakage antenna based on a liquid crystal metamaterial (LCM) and adopting a metal column embedded microstrip line (MCML) transmission structure. Based on the microstrip line (ML) transmission structure, it was observed that by adding two rows of metal columns in the dielectric substrate, electromagnetic waves can be more effectively transmitted to reduce dissipation, and attenuation loss can be lowered to improve energy radiation efficiency. This antenna couples TEM mode electromagnetic waves into free space by periodically arranging 72 complementary split ring resonators (CSRRs). The LC layer is encapsulated in the transmission medium between the ML and the metal grounding plate. The simulation results show that the antenna can achieve a 106° continuous beam turning from reverse −52° to forward 54° at a frequency of 38 GHz with the holographic principle. In practical applications, beam scanning is achieved by applying a DC bias voltage to the LC layer to adjust the LC dielectric constant. We designed a sector-blocking bias feeder structure to minimize the impact of RF signals on the DC source and avoid the effect of DC bias on antenna radiation. Further comparative experiments revealed that the bias feeder can significantly diminish the influence between the two sources, thereby reducing the impact of bias voltage introduced by LC layer feeding on antenna performance. Compared with existing approaches, the antenna array simultaneously combines the advantages of high frequency band, high gain, wide beam scanning range, and low loss.

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Section: Introductionmentioning

confidence: 99%

MCML-BF: A Metal-Column Embedded Microstrip Line Transmission Structure with Bias Feeders for Beam-Scanning Leakage Antenna Design

Hou,

Fang,

Fan

et al. 2024

Sensors

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“…Since the introduction of leaky-wave antennas in the 1940s, they have attracted considerable attention from scholars due to their unique radiation characteristics and excellent beam-scanning abilities. In recent years, research on leaky-wave antennas has witnessed significant growth, resulting in the emergence of various forms of such antennas [1][2][3][4][5]. Leaky-wave antennas offer not only high efficiency but also advantages like low profile, compact size, and simple feeding structure [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A Ka-band Holographic Metasurface Leaky-wave Antenna Based on Liquid Crystal

Hou,

Fang,

Wang

et al. 2023

Preprint

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Beam-scanning holographic hypersurface leaky-wave antennas have been a focus of attention for many scholars in recent years, and numerous related results have been obtained. However, these antennas suffer from several issues such as small beam-scanning range, low gain, and unsatisfactory impedance matching. To address these problems, this paper proposes a microstrip line (ML) antenna unit based on liquid crystal (LC) materials etched Complementary Split Ring Resonator (CSRR). In a first-of-its-kind approach, the substrate integrated waveguide (SIW) structure and the ML transmission structure are combined to present the SIW-ML transmission structure. The antenna operates in the Ka-band with excellent resonance characteristics at 34.7 GHz, and the S11 parameters are below − 13 dB in the frequency range of 30–40 GHz, indicating outstanding impedance matching. By arranging 56 antenna units, a periodic leaky-wave antenna is created, enabling fixed-frequency beam-scanning at 34.7 GHz. Experimental results show that the antenna can achieve scanning of angles between − 53° and + 60° with a gain of up to 12.63 dB. Once single-beam scanning is achieved, a method combining LC and discrete amplitude weighting technique, as well as multi-beam theory, is proposed for multi-beam study. Experimental results reveal that the designed 56-unit beam-scanning antenna can effectively realize beam scanning in two directions.

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“…A CTIVE integrated antennas [1] are widely used in applications such as the mobile system, the satellite communication, and the personal communication system (PCS). Recently, leaky-wave antennas (LWA's) have become popular and there is a growing interest in active leaky-wave antennas used as frequency-scanning elements [2], [3]. Leaky-wave antennas possess the advantages of low-profile, fabrication simplicity, easy matching, narrow beamwidth, and frequencyscanning capability.…”

Section: Introductionmentioning

confidence: 99%

A novel two-beam scanning active leaky-wave antenna

Wang

Jou

1999

IEEE Trans. Antennas Propagat.

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A novel two-beam scanning active leaky-wave antenna (LWA) has been developed. This LWA with a two-terminal feeding microstrip line structure is integrated with a varactortuned X-band high-electron mobility transistor (HEMT) voltagecontrolled oscillator (VCO). The signal of the VCO is injected via a T-divider into the radiating element. To excite the first higher order mode, the designed antenna is fed asymmetrically at both ends of the microstrip line. Compared with singleterminal feeding leaky-wave antennas, this configuration offers the advantages of dual-direction and suppression of the reflected wave caused by the open end of the radiating element. The scanning angle is steered over a range of 24-46 for the right beam and 128-150 for the left beam. The Effective isotropic radiated power (EIRP) is calculated to be 17.5 and 16.67 dBm at 10.4 GHz, respectively. The measured return loss S11 is less than 010 dB in the range of 9-11.5 GHz. The transmission coefficient S21 indicates that the power radiates into the space.

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Coplanar waveguide to coplanar strips-fed active leaky-wave antenna

Cited by 5 publications

References 0 publications

MCML-BF: A Metal-Column Embedded Microstrip Line Transmission Structure with Bias Feeders for Beam-Scanning Leakage Antenna Design

MCML-BF: A Metal-Column Embedded Microstrip Line Transmission Structure with Bias Feeders for Beam-Scanning Leakage Antenna Design

A Ka-band Holographic Metasurface Leaky-wave Antenna Based on Liquid Crystal

A novel two-beam scanning active leaky-wave antenna

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