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Configurations of BJT01:16

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Bipolar Junction Transistors (BJTs) are categorized into various types based on their configurations, each with distinct characteristics and applications. The configurations are primarily differentiated by which terminal—base, emitter, or collector—is common to both the input and output circuits.
The common base configuration is noted for its high voltage gain, positioning it as an ideal choice for single-stage amplifier circuits, such as microphone pre-amplifiers. A notable...
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Parallel Resonance01:23

Parallel Resonance

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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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Related Experiment Video

Updated: May 12, 2025

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Compact high-gain circularly polarized patch antenna based on TM30/TM03 mode.

Hoang Nguyen-Huy1, Duc-Nguyen Tran-Viet2, Phuong Kim-Thi3

  • 1Faculty of Electrical and Electronic Engineering, PHENIKAA University, Yen Nghia, Ha Dong, Hanoi 12116, Vietnam.

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|May 6, 2025
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Summary
This summary is machine-generated.

This study introduces a compact, high-gain circularly polarized (CP) microstrip patch antenna. Utilizing a high-order mode patch and a substrate integrated waveguide (SIW) cavity, it achieves significant gain and reduced back radiation.

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Area of Science:

  • Electromagnetics and Wave Propagation
  • Antenna Theory and Design
  • Microwave Engineering

Background:

  • Microstrip patch antennas are widely used due to their low profile and conformability.
  • Achieving high gain and circular polarization simultaneously in a compact form factor remains a challenge.
  • Reducing back radiation is crucial for many antenna applications to minimize interference.

Purpose of the Study:

  • To design and validate a circularly polarized (CP) microstrip patch antenna with high gain and compact dimensions.
  • To investigate the use of high-order modes for enhanced radiation performance.
  • To reduce back radiation using a substrate integrated waveguide (SIW) cavity.

Main Methods:

  • Employed a high-order mode patch antenna design.
  • Utilized diagonal feed and unequal center crossed slot to generate orthogonal TM03 and TM30 modes.
  • Integrated a substrate integrated waveguide (SIW) cavity around the patch to reduce back radiation.
  • Fabricated and measured an antenna prototype for validation.

Main Results:

  • The proposed antenna achieved a compact size of 1.27λ x 1.27λ x 0.03λ at the center frequency.
  • Measured operating bandwidth (S11 < -10 dB, AR < 3 dB) from 5.435 to 5.475 GHz.
  • Achieved high gain radiation of approximately 12 dBi within the operating band.
  • Reduced back radiation by two times compared to a similar antenna without the SIW cavity.

Conclusions:

  • The developed high-order mode microstrip patch antenna effectively radiates high-gain CP waves.
  • The integration of an SIW cavity is a viable method for achieving compact size and reducing back radiation.
  • The prototype measurements validate the design's performance, demonstrating its suitability for applications requiring high gain and low back lobes.