Modal analysis of patch slot designs in microstrip patch antennas

Elsewe, Mohamed M.; Chatterjee, Deb

doi:10.1109/ropaces.2016.7465411

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…4. According to (15) of the Appendix, the total admittance is the parallel combination of individual modal admittances, and this is also plotted for modes 1 and 3 in Fig. 4.…”

Section: A Characteristic Mode Analysismentioning

confidence: 99%

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U-Slot Patch Antenna Principle and Design Methodology Using Characteristic Mode Analysis and Coupled Mode Theory

Joseph

LaPointe

2019

IEEE Access

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Patch antennas incorporating a U-shaped slot are well-known to have relatively large (about 30%) impedance bandwidths. This work uses Characteristic Mode Analysis to explain the impedance behavior of a classic U-slot patch geometry in terms of Coupled Mode Theory and shows the relevant modes are in-phase and anti-phase coupled modes whose resonant frequencies are governed by Coupled Mode Theory. Additional analysis shows that one uncoupled resonator is the conventional TM01 patch mode and the other is a lumped LC resonator involving the slot and the probe. An equivalent circuit model for the antenna is given wherein element values are extracted from Characteristic Mode Analysis data and which explicitly demonstrates coupling between these two resonators. The circuit model approximately reproduces the impedance locus of the driven simulation. A design methodology based on Coupled Mode Theory and guided by Characteristic Mode Analysis is presented that allows wideband U-slot patch geometries to be designed quickly and efficiently. The methodology is illustrated through example.

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“…4. According to (15) of the Appendix, the total admittance is the parallel combination of individual modal admittances, and this is also plotted for modes 1 and 3 in Fig. 4.…”

Section: A Characteristic Mode Analysismentioning

confidence: 99%

“…The parallel combination of two such circuits, seen in Fig. 11(a), captures the net impedance behavior of a geometry where two characteristic modes are relevant, as indicated by (15). Here, there is no inter-modal coupling due to orthogonality of the characteristic modes.…”

Section: Equivalent Circuit Modelmentioning

confidence: 99%

U-Slot Patch Antenna Principle and Design Methodology Using Characteristic Mode Analysis and Coupled Mode Theory

Joseph

LaPointe

2019

IEEE Access

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“…TCM was applied on the analysis of various different types of antennas such as wire antennas, handset antennas, printed MIMO antennas, and slot antennas . In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Refs. , different slot shapes such as U, L, E, T, and circular were investigated. It was observed that as the size of the slot increases the modes get affected.…”

Section: Introductionmentioning

confidence: 99%

“…TCM was applied on the analysis of various different types of antennas such as wire antennas, 21 handset antennas, 22 printed MIMO antennas, [23][24][25] and slot antennas. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] In Ref. 43, it was shown that designs made with TCM are more robust under real-environment scenarios as compared to designs made with empirical methods.…”

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confidence: 99%

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Analysis of slot-based radiators using TCM and its application in MIMO antennas

Ghalib

Hussain

Sharawi

2018

Int J RF Microw Comput Aided Eng

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In this article, with the help of the theory of characteristic modes (TCM), it is found that the introduction of circular slots in a chassis modifies the chassis modes. Based on the location of the slot, different chassis modes will be affected. For a fixed location, the slot to chassis size ratio plays an important role in its effect on the radiating bandwidth (BW). For a small size ratio, a modified chassis mode will be created without affecting the radiating BW. The current concentration across the slot depends on the shape of the slot (circular, rectangular, triangular, or square) and its location on the chassis. Moreover, the effect of multiple circular slots on the chassis modes is investigated. For slots introduced in a symmetrical fashion, that is, four elements, the modes are not affected and are similar to the original chassis ones. We also investigate the principle behind frequency reconfigurability using TCM analysis. The varactors used for frequency reconfigurability do not alter the radiating BW (Modal Significance plots) but only help in the input impedance matching at different frequency bands of the same mode. If a mode is excited purely using a proper feeding arrangement, the same frequency reconfigurable antenna will behave as a wide band one. Based on the detailed analysis presented in this work, a compact multiple‐input‐multiple‐output annular slot frequency reconfigurable antenna operating between 1.8 and 2.45 GHz is presented. Frequency tuning is achieved using varactor diodes.

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