A Linearly Polarized Radial Line Slot Antenna

Deposit and play A Linearly Polarized Radial Line Slot Antenna through £200 to get 200 wager-free spins. 18+ New eligible UK players only. Offer must be claimed within 14 days of registration. This letter proposes a novel dual linearly polarized single layer radial-line slot-array antenna (D-LPRLSA). The dual polarization is achieved arranging the slots in concentric ellipses and feeding the structure with two ports at the ellipses foci. Antenna ports must be accessed through a 180deg hybrid ring to obtain the dual behavior.

1. A Linearly Polarized Radial Line Slot Antenna Combo
2. A Linearly Polarized Radial Line Slot Antenna Tuner
3. Linearly Polarized Wave

An all-metal linearly polarised radial line slot antenna without dielectric is proposed in this study. As a result of this study, new design suggestions have been introduced which greatly contribute to the performance improvement of this type of antennas for high power microwave application. Linear polarized antennas emit electromagnetic waves on a singular plane that can be horizontal or vertical. For linear polarized RFID antennas to perform best, the RFID tag must be on a fixed, unmoving surface which is aligned to the antenna. In that case the axial ratio is equal to unity (or 0 dB). The axial ratio of a linearly polarized antenna is infinitely big since one of the ellipse axis is equal to zero. For a circularly polarized antenna, the closer the axial ratio is to 0 dB, the better. Polarization Diversity and Isolation.

A reflection cancelling slot set in a linearly polarized radial line slot antenna

Abstract

A radial line slot antenna (RLSA) is a high-gain and high-efficiency planar antenna. Circularly polarized RLSA (CP-RLSA) has realized the highest antenna efficiency of 85 percent to 60 cm phi DBS antenna. A linearly polarized RLSA (LP-RLSA) is also attractive for applications of various subscriber radio systems. However, the slot arrangement for linear polarization gives rise to serious reflection from slots, which disturbs the normal antenna operation. A new slot design of LP-RLSA is presented where reflection canceling slots are added to the conventional ones; four slots form one slot set as a unit radiator of linear polarization. The experiments confirm the design: the antenna return-loss is improved from -2 to -10 dB. The antenna efficiency of 48 and 54 percent are measured for 400 and 600 mm phi antennas, respectively. This is the first report of the normal operation of LP-RLSA's.

• Antenna Design;
• Linear Polarization;
• Slot Antennas;
• Wave Reflection;
• Circular Polarization;
• Direct Broadcast Satellites;
• Reflectance;
• Traveling Waves;
• Communications and Radar

Abstract:

Dielectric materials are one of the major parameters of RLSA antenna. Although so many studies have been conducted on optimization of RLSA antenna but little have been done on examining the effect of slow wave factor in the design. This paper examines the possible pitfall on the antenna performance due to dielectric materials.

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A Linearly Polarized Radial Line Slot Antenna Combo

DOI: 10.1109/aps.2010.5561023

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A Linearly Polarized Radial Line Slot Antenna Tuner

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Linearly Polarized Wave

DOI: 10.1109/tap.1986.1143744