Dual U-Slot Loaded Patch Antenna with a Modified L-Probe Feeding

This study presents a modeling of a new reconfigurable patch antenna with equivalent lumped circuit. Instead of intuitive approaches, including structural changes used in the literature, the proposed reconfigurable antenna design is based on minimum tuning effort using only capacitance adjustments. The proposed design resolves impedance mismatch problem, which occurs due to the nature of using several frequencies by only capacitance adjustments rather than physical structure adjustments. Reconfigurable patch antenna for 2.45 GHz (Wi‐Fi), 3.6 GHz (Wi‐max and 5G), 5.4 GHz (WLAN and 5G) was considered for novel design strategy. A complete equivalent circuit model is configured and validated through AWR software. Full wave analysis of the proposed antenna is performed using CST software. A prototype of the proposed antenna is also fabricated on a FR4 substrate with the dimensions of 48.19 x 38.36 x 1.53 mm3 and measured to validate the full wave analysis and circuit theory solution results. It is shown that the equivalent circuit model, full wave analysis, and measurement results are in good agreement.

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“…The C , L , and R values which match the frequency of the microstrip patch antenna can be calculated as follows, respectively

C = \frac{italicdW ε_{0} ε_{eff}}{2 h} \cos^{- 2} ((), \frac{π y_{0}}{d})

L = \frac{1}{{(2 πf)}^{2} C}

R = \frac{Q}{2 italicπfC}

where y 0 is feed point location, Q is the quality factor of the resonator and it is calculated as in Equation .

Q = \frac{c \sqrt{ε_{eff}}}{4 italicfh}

…”

Section: The Proposed Reconfigurable Antenna Designmentioning

confidence: 99%

Modeling and validation of a new reconfigurable patch antenna through equivalent lumped circuit‐based design for minimum tuning effort

Polat

Geyikoğlu

Çavuşoğlu

2020

Micro & Optical Tech Letters

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“…The maximum length of slot can be calculated by

where

is the desired frequency. Based on the slot impedance equations [ 36 ], the length of the slot should be 0.75 λg for 3.81 GHz, 0.68 λg for 4.2 GHz, 0.42 λg for 6.98 GHz and 0.3 λg for 9.44 GHz. The two pairs of modified L-shaped slots are designed using sixteen slot sizes.…”

Section: Antenna Design and Analysismentioning

confidence: 99%

A compact multiband planar antenna using modified L-shape resonator slots

Rajmohan

Hussein

2020

Heliyon

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A multiband planar antenna designed and proposed with resonator slots is presented. The proposed antenna consists of a planar hexagonal patch composed of two pairs of resonator slots. The antenna is designed using Isola FR408 substrate (ε r = 3.68 and tanδ = 0.0092) with a compact dimension of 21 × 28 × 1.6 mm 3 . The designed antenna has good impedance matching and radiation characteristics for the desired multiband frequencies. Multibands are obtained by etching two pairs of modified mirror-imaged L-shaped resonator slots on the hexagonal planar patch. Simulated and measured results of the antennas' reflection coefficient are provided and there is good agreement between the simulation and measurement results. The antennas' measured peak gains are between 2 dB and 5 dB and measured efficiencies are between 40% and 80%. The proposed antenna, when compared to other antennas, exhibits multiband characteristic by using a single-feed structure and generates different combinations of isolated lower frequency bands in miniature size. The antenna has stable directional radiation patterns and has the potential to meet the requirements of wireless communications applications.

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