A directional planar antenna is disclosed. The antenna has an array of coaxial ring-slot radiating elements formed through a conductive layer on a dielectric substrate. A number of probes, coupled to the ring-slot elements, selectively … US4864314A - Dual band antennas with microstrip array mounted… A primary slotted array antenna operates at 10 GHz. In front of the primary antenna there is disposed a secondary antenna which operates at 1 GHz and is substantially transparent at 10 GHz. Pattern and frequency reconfigurable annular slot antenna using… There, fore from Fig. The path difference between , is while the path difference beand is and can be easily tween deduced geometrically. Slot type planar antennas - Thomson Licensing
Slot antennas are used typically at frequencies between 300 MHz and 24 GHz. The slot antenna is popular because they can be cut out of whatever surface they are to be mounted on, and have radiation patterns that are roughly omnidirectional (similar to a linear wire antenna, as we'll see). The polarization of the slot antenna is linear.
(PDF) Novel Design of Proximity-fed Ultra-wide Band ... A novel design of a proximity-fed annular slot antenna for UWB operation is pre-sented. Different techniques are used to introduce a band rejection to the operated ... A comparative Analysis of Nonresonant Microstrip Patch-Fed ... A comparative Analysis of Nonresonant Microstrip Patch-Fed Dielectric Resonator Antenna and Proximity-Fed Annular Slot Antenna Dipali Gupta
Electrically Small Folded Slot Antenna Utilizing ... - NTRS - NASA
A microstrip-fed slot antenna was designed using Antenna Magus for the following specificationsFEKO’s implementation of the planar Greens function features the ability to model the slot in the ground plane as magnetic triangles, which means that only the slot is meshed and not the ground plane itself... Single Feed L-Slot Microstrip Antenna for Circular… In this paper, a single layer asymmetric L-slot loaded microstrip patch antenna for circular polarization is proposed. The suggested L-slot excites the two orthogonal patch modes in phase quadrature for circular polarization without truncating any corner of the probe feed square patch.
A Novel Concentric Annular-Ring Slot Dual-Band Circularly ...
Microstrip‐line‐fed printed shorted ring‐slot antennas for
US Patent for Annular slot antenna Patent (Patent # 4,547,779 ...
Gain enhancement of annular slot antennas. ... A cross-shaped microstrip-fed ring slot antenna with large bandwidth is presented experimentally in this paper. The characteristics of the antenna ... Microstrip‐line‐fed printed shorted ring‐slot antennas for ... Circular polarization (CP) radiation of the shorted ring‐slot antennas is achieved by selecting a proper length of the shorted section in the ring slot, which is about 3.9 and 8% of the mean circumference of annular and square ring slots, respectively, and feeding the ring slot using a microstrip line 90° to the shorted section. US4547779A - Annular slot antenna - Google Patents A microstrip annular antenna structure is formed by four quarter-wavelength microstrip radiator patches arranged in a quadrant formation and having outwardly directed adjacent radiating apertures which together provide a composite annular radiating slot extending about 360° of azimuth. All such radiators are fed in-phase by a single centrally located feedpoint and equal length microstrip ...
Annular Slot Antenna - How is Annular Slot Antenna ...