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Patent

Reactively loaded corner fed electric microstrip dipole antennas

TLDR
In this article, a corner fed electric microstrip dipole antenna consisting of a thin eleccally conducting, square shaped radiating element formed on one surface of a dielectric substrate, the ground plane being on the opposite surface.
Abstract
A corner fed electric microstrip dipole antenna consisting of a thin eleccally conducting, square shaped radiating element formed on one surface of a dielectric substrate, the ground plane being on the opposite surface. The feed point is located at one corner of the antenna element and the input impedance is matched with a matching microstrip transmission feed line connected to the corner of the antenna. The sides of the radiating element are all equal. The length of the element determines the resonant frequency along the Y axis and the width determines the resonant frequency along the Z axis. This antenna is capable of generating elliptical and circular polarized radiation when reactively loaded using a single element and single feed point.

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Citations
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Patent

Planar wideband antennas

TL;DR: The Planar Inverted Cone Antenna (PICA) as mentioned in this paper is composed of a single flat element vertically mounted above a ground plane with a trimmed top part having the shape of a planar-inverted cone.
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TL;DR: In this paper, a microwave communication antenna consists of a laminated structure having an r.f. radiating conductor affixed on the top side thereof and a feed coupling network within.
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TL;DR: In this article, a microstrip antenna with a linearly polarized radiating patch is varied in resonant frequency by an electronic tuning technique, where a dc bias voltage is combined with the excitation signal to regulate the capacitance of a varactor diode mounted in the antenna structure.
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Walter Feller
TL;DR: In this article, an antenna assembly consisting of a dome-like substrate with a ground plane layer on the interior surface of the substrate and a radiative patch on the outer surface is described.
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Multiple ring microstrip antenna

TL;DR: In this article, a broadband microstrip antenna including two overlapping PC boards is shown to be capable of receiving circular polarized RF electromagnetic radiation while matching the impedance of the rings to the impedance impedance of a plurality of coaxial connectors mounted to the lower PC board.
References
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Patent

Microstrip antenna structure

TL;DR: In this paper, a microstrip antenna radiator is disclosed which includes three edges spaced around its periphery defining three corresponding active slot areas wherein each slot has a different respectively corresponding resonant dimension associated therewith along a direction substantially transverse to the edge which defines the radiating slot.