Explicit efficient coupling impedance formulas for the right-angled isosceles triangle and application to a circularly polarised truncated corners square patch antenna

Lee, Sin; Ooi, Shirt Fun; Lim, Eng Gee; Korolkiewicz, E.

doi:10.1049/iet-map:20060339

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…Similarly, to calculate the self and mutual impedances of the triangular (45 °, 45 °, 90°) segments, the following three cases are considered 35 : When both the ports are located on the perpendicular side of the 45 °, 45 °, 90° triangle, the self‐impedances (eg,

Z_{3_{11}},

Z_{7_{22}}, Z_{11_{11}}

, and so on) are calculated using the following formula:

\begin{array}{l} Z_{x_{italicpp}} = italicjωμh ([, - \frac{\cot italicak}{ak} + \frac{\sin A θ_{2} - \sin A θ_{1}}{{ak}^{2} W_{p} \sin italicak} +) \frac{2 a^{2}}{{W_{p}}^{2} π^{3}} \sum_{m = 1}^{\infty} \frac{{false(\sin m θ_{1} - \sin m θ_{2} false)}^{2} \coth π \sqrt{m^{2} - A^{2}}}{m^{2} \sqrt{m^{2} - A^{2}}} \\ + \frac{2 a^{2}}{{W_{p}}^{2} π^{3}} (]., \sum_{m = 1}^{\infty} \frac{{false(- 1 false)}^{m} (\sin m θ_{1} - \sin m θ_{2}) (\sinh θ_{1} \sqrt{m^{2} - A^{2}} - \sinh θ_{1} \sqrt{m^{2} - A^{2}})}{m (m^{2} - A^{2}) \sinh π \sqrt{m^{2} - A^{2}}}) \end{array}

where,

…”

Section: Analysis Of Meander‐koch Curve Fractal Antennamentioning

confidence: 99%

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Analysis of a hybrid fractal curve antenna using the segmentation method

Jamil

Yusoff

Yahya

2020

Engineering Reports

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A microstrip-fed hybrid Fractal antenna for WLAN application is presented in this article. The proposed antenna is composed of meander and Koch elements combined to form a longer curve that extends the electrical length. This approach simultaneously reduces the operating frequency and antenna size. The Green's functions and segmentation method are used to calculate the input impedance of the hybrid Fractal antenna. For analysis, the amalgamated antenna shape is decomposed into simple regular segments. The impedance parameters of the newly arranged shapes are calculated by the corresponding Green's functions. The impedance matrix equations of all the segments are presented so as to display in a single matrix whose solution determines the input impedance of the complete antenna geometry. To validate the theory, a prototype of the proposed antenna has been numerically simulated and experimentally measured.

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Z_{3_{11}},

Z_{7_{22}}, Z_{11_{11}}

, and so on) are calculated using the following formula:

\begin{array}{l} Z_{x_{italicpp}} = italicjωμh ([, - \frac{\cot italicak}{ak} + \frac{\sin A θ_{2} - \sin A θ_{1}}{{ak}^{2} W_{p} \sin italicak} +) \frac{2 a^{2}}{{W_{p}}^{2} π^{3}} \sum_{m = 1}^{\infty} \frac{{false(\sin m θ_{1} - \sin m θ_{2} false)}^{2} \coth π \sqrt{m^{2} - A^{2}}}{m^{2} \sqrt{m^{2} - A^{2}}} \\ + \frac{2 a^{2}}{{W_{p}}^{2} π^{3}} (]., \sum_{m = 1}^{\infty} \frac{{false(- 1 false)}^{m} (\sin m θ_{1} - \sin m θ_{2}) (\sinh θ_{1} \sqrt{m^{2} - A^{2}} - \sinh θ_{1} \sqrt{m^{2} - A^{2}})}{m (m^{2} - A^{2}) \sinh π \sqrt{m^{2} - A^{2}}}) \end{array}

where,

…”

Section: Analysis Of Meander‐koch Curve Fractal Antennamentioning

confidence: 99%

“…W p and W c are the widths of the two ports p and c, respectively, = 2 f , A = ak/ , B = bk/ , h is the height of the dielectric substrate and k = √ r (1 − j∕Q). Similarly, to calculate the self and mutual impedances of the triangular (45 • , 45 • , 90 • ) segments, the following three cases are considered35 :…”

mentioning

confidence: 99%

Analysis of a hybrid fractal curve antenna using the segmentation method

Jamil

Yusoff

Yahya

2020

Engineering Reports

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“…This disturbance will influence the components of a transmission which disturbs the shield current distribution depending on the configuration of the defect. This disturbance will influence the components of a transmission line [22][23][24]. To further improve the IBW, Configuration 3 is performed.…”

Section: Configurationmentioning

confidence: 99%

Reconfigurable Circularly Polarized Antenna for WLAN and WiMAX

Bikrat¹

2020

IJATCSE

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A simple design for a bi-band circularly polarized (CP) antenna with the capability of switching its polarization between dual-sense CPs is presented in this article, by using a monopole loop antenna as a primary radiator as a proposed antenna. An additional CP band is achieved by controlling the ON/OFF states of two PIN diodes; moreover, the reconfigurability of the polarization between right-hand CP (RHCP) and left-hand CP (LHCP) at three different frequencies 2.8, 3.4 and 4 GHz is realized. For validation, a retractable patch antenna design is offered on the basis of a distinctive situation analysis. The antenna offers a low reconfigurable band and a fixed band at higher frequencies. It also presents a reconfigurable low band and a fixed band at higher frequencies where the antenna has a simulated 3 dB ARBW of 52.8% [1.9-2.5] GHz, while the axial ratio bandwidths for both the RHCP and LHCP states were 5.1% [1.9-2] GHz, 8% [2.4-2.6] GHz, and 52.8% [1.9-2.5] GHz. Located in a reflection bandwidth of -10 dB of 3% [1.62-1.67] GHz, 8% [2.4-2.6] GHz for RHCP and 3% [1.62-1.67 ] GHz, 8%[2.44-2.64 ] GHz for LHCP. The proposed antenna is suitable for wireless applications such as WLAN (2.5 GHz) and part of the medium band of WiMAX..

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“…This technique, however, increases the complexity of the feeding method. A truncated corner or a diagonal slot is widely used for the square or circular patch antenna to achieve perturbation [14,15,16]. Meanwhile, a loaded gap was popularly used for the square-ring radiator [17,18,19,20].…”

Section: Antenna Designmentioning

confidence: 99%

Simple Reconfigurable Circularly Polarized Antenna at Three Bands

Park

Yun

2019

Sensors

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In this paper, a simple design for a triple-band circularly polarized (CP) antenna with the capability of switching its polarization between dual-sense CPs is presented. The proposed antenna is comprised of a monopole loop antenna as a primary radiator. By placing a parasitic loop around the primary radiator, an additional CP band is achieved. Reconfigurability of the polarization between right-hand CP (RHCP) and left-hand CP (LHCP) at three different frequencies of 2.5, 3.3, and 3.8 GHz was realized by controlling the ON/OFF states of two PIN diodes. For validation, the fabricated antenna yielded an impedance bandwidth of 52.6% (2.34–4.01 GHz), while the axial ratio bandwidths for both the RHCP and LHCP states were 3.5% (2.47–2.56 GHz), 6.6% (3.20–3.42 GHz), and 2.4% (3.74–3.83 GHz). The measured broadside gains within the axial ratio bandwidth were 1.2, 2.7, and 1.4 dBi, respectively. Compared to other reconfigurable multi-band CP antennas, the proposed design is the first work to achieve a reconfigurable polarization at three distinct bands at a low fabrication cost by using only two diodes. The proposed antenna is suitable for WLAN and WiMAX applications.

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Explicit efficient coupling impedance formulas for the right-angled isosceles triangle and application to a circularly polarised truncated corners square patch antenna

Cited by 4 publications

References 13 publications

Analysis of a hybrid fractal curve antenna using the segmentation method

Analysis of a hybrid fractal curve antenna using the segmentation method

Reconfigurable Circularly Polarized Antenna for WLAN and WiMAX

Simple Reconfigurable Circularly Polarized Antenna at Three Bands

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