A narrow‐band circularly polarized leaky‐wave antenna with open stopband suppressed

Xu, Shen‐Da; Guan, Dong‐Fang; Liu, Li; Xu, Hantao; Yong, Shaowei

doi:10.1002/mmce.22647

Cited by 11 publications

(8 citation statements)

References 17 publications

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“…The design in [13] is a dielectric resonator whose ARBW extends along the range (5.2-5.58) GHz. The frequency range of the X-band satellite is covered by a CP using a dielectric resonator antenna that is fed by dual ports [14] and a leaky-wave antenna [15].…”

Section: Introductionmentioning

confidence: 99%

A Compact Broadband Circularly Polarized Wide-Slot Antenna With Axial Ratio Bandwidth Encompassing LTE 42 and LTE 43 Standards of 5G Mid-Band

et al. 2023

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This study presents a compact broadband wide-slot antenna with broadband left-hand circular polarization compatible with both LTE 42 and LTE 43 standards of 5G mid-band applications. The proposed antenna is fabricated on an FR4 dielectric substrate with overall dimensions of 0.41𝜆 𝑜 × 0.36𝜆 𝑜 × 0.02𝜆 𝑜 , where 𝜆 𝑜 is the free space wavelength at the resonant frequency of the antenna. The antenna ground plane is etched to form a square radiating slot with a pair of rectangular ground stubs that are diagonally placed inside the slot. On the other side of the antenna, the feed line is loaded by horizontal and vertical stubs to improve the coupling between the feed line and the square slot. To generate a circular polarization, the feeding stubs cooperate with the pair of rectangular ground stubs to excite the radiating slot of the antenna at two different feeding points whose currents have approximately equal amplitude and 90 o phase shift. The measured impedance bandwidth (BW) of the proposed wide-slot antenna is 16.2% (580 MHz along the band 3.3-3.88 GHz), while the observed axial ratio bandwidth (ARBW) is 12.2% (440 MHz in the 3.4-3.84 GHz band). The measured gain values are found to be larger than 2.5 dB along both standards of the 5G mid-band applications.INDEX TERMS Axial Ratio, circular polarization, wide-slot antenna, reflection coefficient, broadband.

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Section: Introductionmentioning

confidence: 99%

A Compact Broadband Circularly Polarized Wide-Slot Antenna With Axial Ratio Bandwidth Encompassing LTE 42 and LTE 43 Standards of 5G Mid-Band

et al. 2023

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“…To suppress the OSB effect, many related methods have been investigated, including CRLH structures, [29][30][31][32][33][34] impedance matching methods, [35][36][37] and asymmetric structures. [38][39][40][41][42] In, 43 it is confirmed theoretically that the OSB effect of the linear polarized period LWA cannot be eliminated if the LWA unit cells are symmetric. Subsequently, it is confirmed theoretically in 44 that the LWA unit cells based on transversal asymmetric structures can realize complete suppression of the OSB effect.…”

Section: Introductionmentioning

confidence: 99%

“…However, this type of LWAs suffer from the open‐stop band (OSB) effect when the beam scans through the broadside, causing the degradation of the gain and the deterioration of the reflection coefficient at broadside frequency. To suppress the OSB effect, many related methods have been investigated, including CRLH structures, 29–34 impedance matching methods, 35–37 and asymmetric structures 38–42 . In, 43 it is confirmed theoretically that the OSB effect of the linear polarized period LWA cannot be eliminated if the LWA unit cells are symmetric.…”

Section: Introductionmentioning

confidence: 99%

A periodic meandering microstrip line leaky‐wave antenna with consistent gain and wide‐angle beam scanning

Wang

Sun

Xue

2022

Int J RF Mic Comp-Aid Eng

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In this article, a periodic leaky‐wave antenna (LWA) with wide‐angle beam scanning and stable gain is proposed based on the meandering microstrip line. Due to the meandering property of the microstrip line, the longitudinal dimension of the antenna is reduced. Firstly, the radiation characteristic of the meandering microstrip line is analyzed in detail. Each corner of the meandering microstrip line is modeled by a shunt capacitance and shunt radiation conductance to acquire the equivalent circuit. Then, the frequency balanced condition is investigated based on the established equivalent circuit to realize continuous beam scanning through broadside. Subsequently, the method of open‐stop band (OSB) suppression is studied by introducing asymmetric perturbation on the LWA unit cell, which actually can be applied to eliminate the OSB effect in arbitrary symmetric LWAs. Finally, an antenna prototype is simulated and measured. The measured results agree well with the simulated results, validating the proposed method of OSB suppression. The measured results show that the designed antenna exhibits the beam scanning capacity of −47° to +76° with the frequency varying from 5.0 to 7.8 GHz and gain variation of 2.9 dB.

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“…The ARBW bandwidth is enhanced to about 7% with 10 dB main lobe to back lobe level ratio using the complex and non-planar structures of the dielectric resonator antennas (DRA) with coaxial feeding technique [12,13]. The ARBW is widened to 3% with 16 dB main lobe to back lobe level ratio in [14] using a large-dimensions leaky-wave antenna. With the aid of coaxial feeding [15], the ARBW improved to 6% but with large back radiation whose main lobe to back lobe level ratio approaches 3 dB.…”

Section: Introductionmentioning

confidence: 99%

Single-Element and MIMO Circularly Polarized Microstrip Antennas with Negligible Back Radiation for 5G Mid-Band Handsets

Alnahwi

Al‐Yasir

See

et al. 2022

Sensors

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In this paper, single-element and MIMO microstrip antenna with two pairs of unequal slits is proposed as a circularly polarized antenna with negligible back radiation for 5G mid-band handsets. The unequal pairs of slits are engraved on the antenna patch to guarantee the presence of the circular polarization (CP). The proximity-coupled feeding technique is used to excite the proposed microstrip antenna in order to provide larger antenna −10 dB bandwidth which approaches 10.8% (3.48–3.87 GHz). A novel analysis technique is proposed in this paper that demonstrates the 3D axial ratio pattern in order to generate CP in the broadside direction without affecting the structure of the ground plane which ensures weak back radiation. The 3 dB axial ratio bandwidth (ARBW) is found to be equal to 4.1% extended along the range (3.58–3.73 GHz). To make the design more compatible with the 5G mid-band handsets, the 2 × 2 MIMO structure of the proposed antenna with reduced mutual coupling (less than −20 dB) is also presented in this work. The simulation and measured results are in good agreement, and both verify the CP characteristics and the weak back radiation of the proposed antenna.

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A narrow‐band circularly polarized leaky‐wave antenna with open stopband suppressed

Cited by 11 publications

References 17 publications

A Compact Broadband Circularly Polarized Wide-Slot Antenna With Axial Ratio Bandwidth Encompassing LTE 42 and LTE 43 Standards of 5G Mid-Band

A Compact Broadband Circularly Polarized Wide-Slot Antenna With Axial Ratio Bandwidth Encompassing LTE 42 and LTE 43 Standards of 5G Mid-Band

A periodic meandering microstrip line leaky‐wave antenna with consistent gain and wide‐angle beam scanning

Single-Element and MIMO Circularly Polarized Microstrip Antennas with Negligible Back Radiation for 5G Mid-Band Handsets

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