Wideband Multiport Matching Phase I: Single-Feed Multiport Antennas

Allen, Jeffery C.; Rockaway, J.; Arceo, Diana

doi:10.21236/ada487178

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…It follows that and , and we use to represent in the rest of the paper. Similar to (10), we also have Because is para-unitary, it is unitary for , which yields Therefore, we obtain (19) Similarly, since the concatenation of and is lossless, we employ the same argument and get (20) These results for the S-matrix determinants are used in the principle results of the next section. …”

Section: Darlington Equivalent Networkmentioning

confidence: 93%

Broadband Matching Bounds for Coupled Loads

Nie

Hochwald

2015

IEEE Trans. Circuits Syst. I

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The Bode-Fano bounds on the integral over all frequency of the logarithm of the reflection coefficient between a source and a load, connected to each other through a passive matching network, are well-known measures of the bandwidth of the matching network and load. When there are multiple coupled loads being driven by multiple independent sources, the notion of a single reflection coefficient is not obvious since energy delivered to one load port may reflect, in part, out another port. Establishing the maximum possible bandwidth of the matching network and loads requires the development of a broadband matching theory that applies to coupled systems. We define a bandwidth measure for coupled loads based on the integral logarithm of their collective power reflection, and develop upper bounds on this measure. These upper bounds can be used to examine the effects of coupling on bandwidth, and to evaluate the broadband performance of matching networks for an arbitrary number of coupled loads.

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Section: Darlington Equivalent Networkmentioning

confidence: 93%

Broadband Matching Bounds for Coupled Loads

Nie

Hochwald

2015

IEEE Trans. Circuits Syst. I

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“…Lemma 1 (SIMO Gain [2]) Let an N -port load with scattering matrix S L be connected to a 1-port generator with reflectance s G by an (N + 1)-port with scattering matrix partitioned as S = s 11 S 12 S 21 S 22 (8) so that Port 1 connects to the generator while Ports 2, . .…”

Section: Preliminaries On Multiport Matchingmentioning

confidence: 99%

“…The paper analyzed ideal multiport transformers to explain the wideband matching of multiport antennas [2]. This analysis shows if a multiport antenna has both inductance and capacitive ports, the transformer can weight these ports to create a resonance and the extra degrees of freedom in the transformer's turns ratios allow a tradeoff between bandwidth and matching.…”

Section: Multiport Transformer Issuesmentioning

confidence: 99%

Characterizing Optimal Multiport Matching Transformers

Allen

Rockway

2012

Circuits Syst Signal Process

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Multiport transformers offer enhanced matching capabilities for multiport loads. These transformers are analyzed to characterize wideband matching designs. An eigenvalue decomposition of the multiport load produces a geometric description of the sublevel sets of the matching transformers and identifies those frequency bands where multiport transformers are effective. A multiport antenna provides a concrete design example.

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“…Antennas have been widely used in almost all areas of the current information world, much like the human eyes and ears, because antennas can convert free-space electromagnetic waves in wireless channels to currents (or guided mode) in transmission line circuits, and vice versa [1][2][3][4][5]. The impedance matching condition [6][7][8][9] at the radiation interface established by the antennas and the surroundings, which is generally pre-designed, determines the conversion efficiency (Fig. 1(a)).…”

Section: Introductionmentioning

confidence: 99%

Commercial-printed-circuitry-compatible Self-superhydrophobic Antennas Based on Laser Direct Writing

Ge¹,

Yang²,

Ren³

et al. 2023

PIER

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Antennas are essential devices to build everything connected in the era of information. However, the quality of communications would be degraded with the presence of raindrops on the antenna surface. Additional antiwater radomes may generate radiation loss and dispersive impedance mismatch over a broad frequency range, which is not acceptable for next-generation communication systems integrating multiple bands. Here, we report the first experimental demonstration of selfhydrophobic antennas that cover the bands of 1.7 GHz, 3.5 GHz, and 8.5 GHz through a laser-directwriting treatment. Experimental results show that the return loss, radiation pattern, and efficiency of self-superhydrophobic antennas can be maintained in the mimicked rainy weather. Furthermore, writing hydrophobic nanostructures on both dielectrics and metals is compatible with commercial printed circuitry techniques widely used in industries. Our technique will augment the laser fabrication technology for specialized electromagnetic devices and serve as a powerful and generalized solution for all-weather wireless communication systems.

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Wideband Multiport Matching Phase I: Single-Feed Multiport Antennas

Cited by 7 publications

References 25 publications

Broadband Matching Bounds for Coupled Loads

Broadband Matching Bounds for Coupled Loads

Characterizing Optimal Multiport Matching Transformers

Commercial-printed-circuitry-compatible Self-superhydrophobic Antennas Based on Laser Direct Writing

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