Analysis and design of a circular-polarized nearly-square-patch antenna using a cavity model

Lee, Sin Keng; Korolkiewicz, E.; Ooi, Shirt Fun

doi:10.1002/mop.21001

Cited by 9 publications

(8 citation statements)

References 7 publications

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“…The resonance of the side-plane conductors is taken into consideration in the antenna design procedure. The measured impedance and axial ratio bandwidths of the proposed antenna are 11.92 % and 4.81 %, respectively, which are better than 5 % and 1 %, respectively, of the conventional microstrip line-fed nearly square patch antenna [8]. …”

Section: Resultsmentioning

confidence: 82%

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Finite-width conductor-backed coplanar waveguide-fed circularly polarized side-plane antenna

Lu¹,

Chen²,

Hsu

2010

2010 IEEE Antennas and Propagation Society International Symposium

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IntroductionThe coplanar waveguide with a lower ground plane forms the conductor-backed coplanar waveguide (CBCPW). Due to the lower ground plane, the mechanical strength and heat-sinking capability of the conventional coplanar waveguide are improved [1]. In practice, the substrate and the ground planes of the CBCPW are usually of finite width. The CBCPW mode and the microstrip-like mode coexist in the finite-width CBCPW. Both of them have zero cutoff frequency [2]- [3]. The phase velocity of the microstrip-like mode (MSL) is slower than the CBCPW mode. Therefore, the MSL mode takes power away all the time. The leaky MSL mode causes the resonances of the side-plane conductors. The transmitted power is reduced by the reflected and radiated power when the side-plane conductors resonate [4]. The unwanted radiation maybe degrades the performance of the finite-width CBCPW-fed antenna unless through-plated vias are placed at the inner edges of the side-plane conductors [5]. Using through-plated vias increases the manufacturing cost. With proper design, the side-plane conductors fed by finite-width CBCPW can form a simple, vialess, unidirectional, and linearly polarized antenna [6]. In this paper, a compact finite-width CBCPW-fed circularly polarized (CP) side-plane antenna is proposed. Antenna DesignThe geometry of the proposed antenna is shown in Fig. 1. The transverse slotlines cut the side-plane conductors into four separate conductors. The whole structure of antenna is composed of four nearly square conductors except the two shorting strips. The two shorting strips excite the upper right conductor and the upper left conductor to form a CP antenna. The offset between the two shorting strips excites the two conductors to radiate in phase as that in the previous work [6]. The nearly square conductor has two spatially orthogonal resonant modes [7]-[8]. The two modes have closely resonant frequencies, which are utilized to produce 90 degrees phase delay between them. Therefore, the CP radiation is achieved. In our design, there are four nearly square conductors. The upper pair is excited directly by the shorting strips. The lower pair is not only part of the transmission line but also part of the antenna. The radiation of the lower two conductors help the upper two directly-fed conductors achieve better CP radiation due to the small gap G h .978-1-4244-4968-2/10/$25.00 ©2010 IEEE For large G h , the coupling between the upper and lower conductors is weak and the CP radiation is small. There is an optimum value of G h for the axial ratio and the bandwidth of axial ratio. For simplicity, we let W a , L a and G v equal to W g , L g and G, respectively. The value of L f is fixed to (L a -L c ). The various value of G-S-G is restricted due to the characteristic impedance of 50 ohm CBCPW line. The structure in Fig. 1 forms a left-handed CP (LHCP) radiation. We can feed the upper right conductor with shorting strip first and then feed the upper left conductor at the end of the structure to obtain a right-handed CP (RHCP) anten...

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Section: Resultsmentioning

confidence: 82%

“…The offset between the two shorting strips excites the two conductors to radiate in phase as that in the previous work [6]. The nearly square conductor has two spatially orthogonal resonant modes [7]- [8]. The two modes have closely resonant frequencies, which are utilized to produce 90 degrees phase delay between them.…”

Section: Antenna Designmentioning

confidence: 96%

Finite-width conductor-backed coplanar waveguide-fed circularly polarized side-plane antenna

Lu¹,

Chen²,

Hsu

2010

2010 IEEE Antennas and Propagation Society International Symposium

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“…The coordinate of the feeding position is (X 0 , Y 0 ), where Y 0 is equal to 0 in this case due to microstrip feeding, while Y 0 can have a positive value for coaxial feeding. According to [21], the TM 01 and TM 10 modes are simultaneously excited to generate two orthogonal electric-field (E-field) components in the far field. The two components should have the same magnitude but 90 o phase difference for CP radiation, i.e., (1).…”

Section: A Patch Design With Offset Feedingmentioning

confidence: 99%

“…2(b) also shows the regions of offset feeding for LHCP and RHCP. According to [21], a quarter-wave transformer is always required for impedance matching of the antenna to 50 Ohms microstrip line, whose need is removed in the proposed design by using the grounded stubs and DGS for simultaneous matching and isolation. Details are discussed in the next section.…”

Section: A Patch Design With Offset Feedingmentioning

confidence: 99%

“…However, the 3D construction might not be used for planar applications. A patch antenna was analyzed and designed for CP operation by using the offset feeding structure [21], but it is only for the single-input single-output application. Therefore, the above discussion indicates that the realization of planar CP MIMO antenna with small edge-to-edge separation and simple feeding structure is still a challenge.…”

Section: Introductionmentioning

confidence: 99%

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Isolation Enhancement of Closely Packed Dual Circularly Polarized MIMO Antenna Using Hybrid Technique

Jamal

Yeung

2020

IEEE Access

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Mutual coupling always seriously degrades the antenna performance in multiple-input multiple-output (MIMO) systems but this issue has been rarely investigated for antennas with circular polarization. In this paper, a planar and compact circularly polarized MIMO patch antenna with the polarization diversity is presented. Three grounded stubs and a mirrored F-shaped defected ground structure are used to achieve simultaneous matching and isolation between the two patches with offset feeding for circular polarization. The antenna elements are closely packed with the edge-to-edge distance of 0.06λ 0 at the desired frequency of 2.5 GHz. The measured results indicate that the proposed antenna achieves the impedance matching (S 11 < −10 dB), high isolation (S 12 < −20 dB), and circular polarization (axial ratio<3 dB) within the frequency band of 2.5-2.55 GHz. The radiation patterns and realized gains are measured, showing good agreement between the simulation and measurement. INDEX TERMS Circular polarization (CP), multiple-input multiple-output (MIMO), axial ratio (AR), defected ground slot (DGS), envelope correlation coefficient (ECC), left-hand circular polarization (LHCP), right-hand circular polarization (RHCP).

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Circularly Polarized Planar and Curve structured antenna using symmetrical crossed elliptical slots

Gupta

Kundu²,

Rawat³

et al. 2022

Wireless Pers Commun

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Analysis and design of a circular-polarized nearly-square-patch antenna using a cavity model

Cited by 9 publications

References 7 publications

Finite-width conductor-backed coplanar waveguide-fed circularly polarized side-plane antenna

Finite-width conductor-backed coplanar waveguide-fed circularly polarized side-plane antenna

Isolation Enhancement of Closely Packed Dual Circularly Polarized MIMO Antenna Using Hybrid Technique

Circularly Polarized Planar and Curve structured antenna using symmetrical crossed elliptical slots

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