Broadband Square Slot Antenna for Circular Polarization with Separated L-Probes and Stubs in the Slot

Joseph, Ronald; Nakao, Shin-ichi; Fukusako, Takeshi

doi:10.1587/transcom.e94.b.951

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…The vertical component of the L-shaped probe that succeeds the microstrip feed line, designed at around λ 0 /4 of the centre frequency, is optimised to 26 mm long (Lv ) and 1 mm wide (Wv ). The phase condition 'dependence' of CP prominently depends on this parameter [15]. The vertical probe is extended to the edge of the substrate through a matching inductive microstrip feed line of 118 Ω with a width (W m ) of 0.4 mm and length (L m ) of 13.5 mm to match the impedance of the 50 Ω coaxial cable.…”

Section: Antenna Structurementioning

confidence: 99%

Circularly Polarized Broadband Antenna With Circular Slot on Circular Groundplane

Joseph¹,

Fukusako

2012

PIER C

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Abstract-A novel circularly polarized antenna with a circular radiating aperture and circular ground plane for broadband characteristics is presented in this paper. The vertical and horizontal components of the L-shaped probe are separated and placed at the front and back sides of the substrate. The antenna is excited by a microstrip line which is connected to the vertical component of the L-shaped probe and electromagnetically couples the signal to the horizontal component of the L-shaped probe. The concept of placing an appropriate stub in the slot, by observing the electric field vector behaviour in the slot, is proposed to enhance the axial ratio (AR) bandwidth by around 15%. The fabricated antenna shows wideband impedance and circular polarization characteristics of 48% along with a maximum gain of 6 dBic. The measured and simulated antenna characteristics are in good agreement.

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Section: Antenna Structurementioning

confidence: 99%

Circularly Polarized Broadband Antenna With Circular Slot on Circular Groundplane

Joseph¹,

Fukusako

2012

PIER C

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“…Therefore, such an L-shaped structure generates a phase difference by traveling-wave-like excitation. A CP antenna based on a similar principle is discussed in [14]. To explain this behavior, Fig.…”

Section: Parametric Study On the Position On The Ground Planementioning

confidence: 99%

Design of Leaky Wave Antenna With Composite Right-/Left-Handed Transmission Line Structure for Circular Polarization Radiation

Ishii¹,

Fukusako²,

Alphones³

2012

PIER C

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Abstract-This paper presents a design procedure for the generation of circular polarization (CP) from the composite right/left handed (CRLH) transmission line (TL) with a coupled inter-digit structure and an inductive stub. The E x and E y components are generated from the parallel stubs and the fingers, respectively. The 90 • -phase difference can be obtained by optimizing the dimension of the unit cell. In addition, the suitable amplitude ratio of |E x | and |E y | for CP generation is obtained by selecting a suitable position of the CRLH-TL between both edges of the ground. As a result, a CP with a measured bandwidth of 30.5% for an axial ratio (AR) of < 3 dB in the boresight direction is obtained. Using the behavior in both the left-handed (LH) and right-handed (RH) frequency regions, a scanning angle of the main beam of approximately 30 • can be obtained by varying the frequency between 2.58 GHz and 2.99 GHz. Furthermore, the principle of CP generation is discussed.

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“…, a low‐profile square‐ring slot on FR‐4 was utilized to generate CP and was able to achieve a 4–10% increase in the axial ratio (AR) bandwidth. Moreover, Joseph et al successfully employed an L‐shaped probe‐feed to produce CP broadband. L‐Probe proximity fed‐patch antennas were analyzed and designed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Single-fed broadband circularly polarized unidirectional antenna using folded plate with parasitic patch for universal UHF RFID readers

Dentri

Phongcharoenpanich

Kaemarungsi

2016

Int J RF and Microwave Comp Aid Eng

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This research proposes a simple economical broadband circularly polarized antenna for universal ultra‐high frequency (UHF) RF identification (RFID) readers. The antenna utilizes a folded plate, a two‐corner truncated parasitic patch, and a ground plane. The folded plate, which is fabricated from one single plate, consists of a two‐corner truncated main patch, a wall patch, and a feed line, where the main patch is perpendicular to the wall patch, which is in turn perpendicular to the feed line. The folded plate enables currents to flow with a phase difference. The simulation results achieved an |S11| < −15 dB of 805–966 MHz (18% bandwidth), a 3‐dB axial ratio (AR) bandwidth of 834–962 MHz (14% AR bandwidth), and a gain higher than 8.6 dBic. The measured results obtained an |S11| < −15 dB of 806–970 MHz (18%), a 3‐dB AR bandwidth of 816–963 MHz (16%), and a gain greater than 7.8 dBic. The proposed antenna is applicable for universal UHF RFID readers as it covers the entire operating UHF RFID frequency range of 840–960 MHz. The parametric study and evolution of the proposed antenna are detailed in this research paper as well. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:575–587, 2016.

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Broadband Square Slot Antenna for Circular Polarization with Separated L-Probes and Stubs in the Slot

Cited by 4 publications

References 17 publications

Circularly Polarized Broadband Antenna With Circular Slot on Circular Groundplane

Circularly Polarized Broadband Antenna With Circular Slot on Circular Groundplane

Design of Leaky Wave Antenna With Composite Right-/Left-Handed Transmission Line Structure for Circular Polarization Radiation

Single-fed broadband circularly polarized unidirectional antenna using folded plate with parasitic patch for universal UHF RFID readers

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