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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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High Efficiency Dual-Band Dual-Circularly Polarized Transmitarray Antenna.

Tianling Zhang1, Boxiang Yang2, Jiayin Guo3

  • 1School of Electronic Engineering, Xidian University, Xi'an 710071, China.

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|March 27, 2025
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Summary
This summary is machine-generated.

This study presents a dual-band transmitarray antenna for 5G millimeter-wave applications. The proposed antenna achieves high gain and efficiency across the 28/39 GHz bands.

Keywords:
dual banddual circularly polarizedhigh efficiencytransmitarray antenna

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Area of Science:

  • Electrical Engineering
  • Antenna Theory
  • Millimeter-Wave Technology

Background:

  • Fifth-generation (5G) wireless communication systems require high-performance antennas for millimeter-wave (mmWave) frequencies.
  • Dual-band operation is crucial for flexibility and capacity in mmWave applications.
  • Transmitarray antennas offer a planar and scalable solution for beamforming and high-gain applications.

Purpose of the Study:

  • To propose and demonstrate a novel dual-band, dual-circularly polarized transmitarray antenna (TA).
  • To achieve efficient operation at the 28 GHz and 39 GHz frequency bands for 5G mmWave systems.
  • To validate the design through simulation and experimental measurement.

Main Methods:

  • Design of a transmitarray unit cell comprising a broadband linearly polarized (LP) receiving part and a dual-band dual-circularly polarized transmitting part.
  • Implementation of over-2-bit phase compensation using U-shaped slot dimensions and receiving part rotation.
  • Fabrication and measurement of a 24x24 TA array with an aperture size of 88.8 mm x 88.8 mm, fed by a wide-band corrugated horn antenna.

Main Results:

  • Simulated maximum gains of 26.28 dBic (26.5-29.5 GHz) and 27.4 dBic (37-40 GHz).
  • Measured maximum efficiencies of 53.56% (low band) and 42.89% (high band).
  • Demonstrated dual-band (28/39 GHz) operation suitable for 5G mmWave.

Conclusions:

  • The proposed transmitarray antenna effectively covers the 28/39 GHz bands for 5G mmWave applications.
  • The design offers advantages such as low cost, high gain, and high efficiency.
  • The experimental validation confirms the simulation accuracy and the antenna's practical viability.