Dual-Band Microstrip Patch Antenna with Switchable Orthogonal Linear Polarizations

Abstract

This study presents a dual-band polarization-reconfigurable antenna that comprises a large square patch with a pair of corner-cut edges and two small square patches with a shorting via. Two PIN diodes are located between the large square patch and two small square patches. Depending on the bias state applied to the two PIN diodes, each small patch may be disconnected or connected to the large square patch. As a result, the proposed antenna can provide polarization reconfigurability between two orthogonal linear polarizations. Further, the proposed antenna operates at 2.51 GHz and 2.71 GHz. From the measured results, the proposed antenna shows a 10 dB bandwidth of 2.39% (2.49-2.55 GHz) and 2.58% (2.68-2.75 GHz). In this work, the frequency ratio can be easily controlled by changing the size of the small patch.

Design of patch antenna with polarization control module to achieve broad 3‐dB gain bandwidth over entire AR range

“…Microstrip patch antennas have been widely adopted for various applications, such as the Global Navigation Satellite System (GNSS), Satellite Digital Audio Radio Service (SDARS), and mobile communications, due to their low profile, low cost, and ease of fabrication. [1][2][3][4] However, conventional patch antennas are limited in their ability to cover a wide range of applications because of their narrow bandwidth characteristics. To improve bandwidth properties of the patch antennas, various broadband techniques, such as using slotted patches, air gap, and L-shaped indirect probe feed structures, have been introduced.…”

Design of a 16‐element array antenna with a planar L‐shaped probe for a direction of arrival estimation of the unidentified broadband signal

“…Patch antennas are typical directional antennas with an appropriate low profile, low cost, and simple structure, which is well suited for use as an antenna element in portable direction‐finding systems. However, patch antennas have narrow band characteristics, and various bandwidth enhancement efforts have been made, including methods of controlling the current path on the patch surface such as slotted patches and slotted ground . A recent report shows that the broadband and the miniaturization of a patch antenna are derived by applying an indirect feed structure using an L‐shaped probe and a shorted patch structure .…”

“…However, patch antennas have narrow band characteristics, and various bandwidth enhancement efforts have been made, including methods of controlling the current path on the patch surface such as slotted patches and slotted ground. [9][10][11] A recent report shows that the broadband and the miniaturization of a patch antenna are derived by applying an indirect feed structure using an L-shaped probe and a shorted patch structure. 12 However, the L-shaped probe of the wire structure is limited in generating a stable and sufficient mutual coupling coefficient between the patch and the probe in L-band applications.…”

Liquid‐metal‐fluidically polarization reconfigurable microstrip patch antenna

“…A reconfigurable antenna is used in various areas of the modern telecommunication system as a solution to increase the channel capacity and reduce the radio frequency (RF) components in limited environments . In general, reconfigurable properties can be classified as the frequency (eg, operating frequency, frequency bandwidth), radiation pattern (eg, radiation shape, gain), and polarization (eg, horizontal or vertical, left‐hand or right‐hand circular polarization) . In particular, polarization reconfigurable antennas are useful for digital multimedia broadcasting (DMB) systems, radio frequency identification (RFID) tagging systems, and satellite communication systems because they provide both circular polarization (CP) and linear polarization (LP) with a single antenna .…”

“…[1][2][3] In general, reconfigurable properties can be classified as the frequency (eg, operating frequency, frequency bandwidth), 4,5 radiation pattern (eg, radiation shape, gain), 6,7 and polarization (eg, horizontal or vertical, left-hand or right-hand circular polarization). [8][9][10] In particular, polarization reconfigurable antennas are useful for digital multimedia broadcasting (DMB) systems, radio frequency identification (RFID) tagging systems, and satellite communication systems because they provide both circular polarization (CP) and linear polarization (LP) with a single antenna. [11][12][13] In addition, a polarization reconfigurable antenna can be a good solution to mitigate multipath effects and provide flexible orientation capability for both transmitter and receiver.…”