Design Method of a Circularly-Polarized Antenna Using Fabry-Pérot Cavity Structure

Ju, Jeongho; Kim, Dongho; Lee, Wangjoo; Choi, Jin Young

doi:10.4218/etrij.11.0110.0267

Cited by 36 publications

(23 citation statements)

References 15 publications

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“…5.78 GHz, computed using (13). This slight discrepancy is mainly due to small but finite material losses included in the dielectric substrates and copper patterns.…”

Section: Af(θ φ)mentioning

confidence: 93%

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Single- and dual-band leaky wave antennas using an electromagnetic band gap structure

Kim

2014

Journal of Electromagnetic Waves and Applications

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We propose new and practical design methods of a low-profile and high-gain leaky wave antenna (LWA). Based on a required dispersion relationship, we suggest appropriate equivalent transmission line models representing a unit cell of the LWA, which determines a specific frequency of maximum radiation together with optimal circuit values essential for maximum gain at a boresight direction. According to the equivalent model approach, we can design overall structure of the high-gain LWA very easily and accurately. In addition, we also propose a novel way of deriving dual-band resonance from a simple single-band-resonating LWA by means of an electromagnetic band gap (EBG) structure. In order to make the LWA resonate at two different frequencies, we intentionally introduce a propagation stop band into an existing one pass band by inserting an EBG structure. By doing so, we can obtain two new specific conditions resulting in maximum radiation toward a boresight direction at the two resonant frequencies locating on both sides of the inserted stop band. All experimental results show good agreement with theoretical predictions, which proves the validity and effectiveness of our approaches.

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“…5.78 GHz, computed using (13). This slight discrepancy is mainly due to small but finite material losses included in the dielectric substrates and copper patterns.…”

Section: Af(θ φ)mentioning

confidence: 93%

“…[12,13] Assuming that k(= β − jα) and k 0 are propagation constants in a periodic structure and free space, then radiation occurs under the condition of |β| ≤ k 0 , which belongs to a fast wave regime. Accordingly, a resulting radiation beam depending on β radiates toward θ , which can be determined by…”

Section: Design Of a Single-band Lwamentioning

confidence: 99%

Single- and dual-band leaky wave antennas using an electromagnetic band gap structure

Kim

2014

Journal of Electromagnetic Waves and Applications

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“…The Fabry‐Perot Resonator (FPR) antenna, which consists of a primary radiating element placed inside an air‐filled half‐wavelength cavity formed between a reflector and a partially reflecting surface (PRS), has potential to achieve the above requirements . In order to realize the CP FPR antenna, the well‐known method is to use the PRS as a polarization transformed structure to convert linearly polarized (LP) waves to CP waves . These antennas are typically constructed with single or multi‐layer of frequency selective surfaces (FSSs) printed on the substrate.…”

Section: Introductionmentioning

confidence: 99%

Broadband circularly polarized Fabry‐Perot antenna utilizing Archimedean spiral radiator and multi‐layer partially reflecting surface

Tran

Bui

et al. 2018

Int J RF Microw Comput Aided Eng

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This article presents a method to design broadband circularly polarized (CP) Fabry‐Perot Resonator (FPR) antenna. The proposed antenna is based on multi‐layer thin dielectric slabs arranged in close proximity as a partially reflecting surface (PRS) and an Archimedean spiral as a CP radiating source. Experimental results show a broadband operation from 6 to 13 GHz, in which the reflection coefficient is less than −10 dB and the axial ratio (AR) is lower than 3 dB. In addition, good radiation patterns and high broadside gain of better than 10.8 dBic are achieved over the operating bandwidth. The proposed antenna can be used for C‐ and X‐band satellite communications.

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“…Good agreement between the predicted and measured data shows the validity and usefulness of our approach. To produce CP waves, we design the unit cell of the superstrate as a square patch with a pair of truncated corners [6]. As we can see in Fig.…”

mentioning

confidence: 99%

“…Under an assumption of a normal propagation (along the z-direction) in the cavity, reflection and transmission coefficients of the superstrate and the ground plane are given by Ju et al [6] and Balanis [8] a1 = e −jf :x − pol., or b 1 = e −jf :y − pol. Tyybn + 1 + Tyxan + 1 (2) where ϕ is the electrical length between the ground plane and the superstrate, n is total repetition number of reflection in the cavity, π is the reflection phase of the ground plane and R and T are the reflection and transmission coefficients of the superstrate, respectively.…”

mentioning

confidence: 99%

Circularly‐polarised high gain cavity antenna based on sequentially rotated phase feeding

Kim

2013

Electron. lett.

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A Fabry-Pérot cavity (FPC) array antenna providing both very high gain and circularly-polarised (CP) behaviour is proposed. To increase antenna gain and to obtain the CP characteristic, a superstrate is introduced above 2 × 2 feeding microstrip patch antennas (MPAs), which converts linearly-polarised (LP) incident waves to CP waves. Input phase difference between MPAs is designed to be exactly 90°to generate the high-quality CP characteristic in cooperation with the superstrate. By using the FPC, very high gain can be obtained with only a small number of feeders, which also provides another advantage of low mutual coupling among the neighbouring MPAs. Although the proposed antenna is very simple in its structure, it readily provides very high gain, high-quality CP property and very low axial ratio in a wide frequency range, which are great advantages compared with conventional CP antennas.Introduction: Various approaches have been proposed to improve the antenna gain and axial ratio (AR) of circularly-polarised (CP) antennas fed by single or multiple microstrip patch antennas (MPAs) [1][2][3][4][5]. A technique providing sequentially rotating phase values into each MPA has also been used to improve AR bandwidth, polarisation purity and symmetry in radiation patterns [2][3][4][5]. However, the conventional sequential rotation technique requires an array construction consisting of a large number of patch antennas, which increases not only the complexity in antenna design, but feed loss causing degradation of overall antenna efficiency.In this Letter, we present a high gain Fabry-Pérot cavity (FPC) antenna for a wireless local area network (WLAN) (5.15-5.35 GHz) application, which can radiate CP waves with a fairly low AR property. Compared with conventional CP array antennas, our antenna has some advantages such as high gain, simple feeding networks and excellent CP quality. By using an FPC technique, we can obtain very high gain with the help of only 2 × 2 arrays of simple linearly-polarised (LP) rectangular MPAs. Owing to a large separation distance among neighbouring antennas, the mutual coupling effect is much less than that in the conventional arrays. To verify our design approach, our theoretical prediction is compared with simulations using CST Microwave Studio. Good agreement between the predicted and measured data shows the validity and usefulness of our approach.

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Design Method of a Circularly-Polarized Antenna Using Fabry-Pérot Cavity Structure

Cited by 36 publications

References 15 publications

Single- and dual-band leaky wave antennas using an electromagnetic band gap structure

Single- and dual-band leaky wave antennas using an electromagnetic band gap structure

Broadband circularly polarized Fabry‐Perot antenna utilizing Archimedean spiral radiator and multi‐layer partially reflecting surface

Circularly‐polarised high gain cavity antenna based on sequentially rotated phase feeding

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