In this paper, a compact multiple-input-multiple-output (MIMO)/diversity antenna with WLAN band notch characteristics, high isolation, and good ECC suitable for portable ultra-wideband (UWB) applications is presented. The proposed antenna has optimized dimensions of 29mm× 38mm. The antenna consists of two orthogonal circular monopoles with a 50Ω microstrip feed line. In addition, to enhance the...

A Circular Microstrip Antenna with slot cut in it for tunable and dual band operation has been presented. The existence of an electrically small slot along the feed axis or the perpendicular axis changes the resonant frequency of the patch leading to tunability. If both slots co-exist and are of comparable lengths, which equals to greater than half of the radius, dual frequency operation is obt...

Circularly polarized slot cut rectangular microstrip antenna on thinner substrate is proposed. The dimensions of the slots are modified such that the resonance frequencies of the two orthogonal modes are close to each other to realize circular polarization. To improve upon the gain, three layer suspended configuration is proposed which yields VSWR and axial ratio BW of 40 and 9 MHz, respectivel...

A compact-size planar antenna with ultra-wideband (UWB) bandwidth and directional patterns is presented. The antenna can be fabricated on a printed circuit board (PCB). On one side of the PCB, it has a circular patch, and on the other side it has a slot-embedded ground plane with a fork-shaped feeding stub in the slot. Directional radiation is achieved by using a reflector below the antenna. To...

This paper presents the design of a wideband circularly polarized antenna using a multiple-circular-sector dielectric resonator (DR). The DR is composed of twelve circular-sector DRs with identical central angles of 30 ∘ but with different radii. A genetic algorithm is utilized to optimize the radii of the twelve circular-sector DRs to realize wideband circular polarization. The proposed antenn...

This paper reviews not only the characteristic of the linearly-polarized plate-laminated waveguide slot array antenna in the 60GHz band but also conversion to circular or tilted linear polarization by adding a layer of apertures over the antenna. The linearly-polarized antenna achieves about 80% antenna efficiency and more than 32 dBi of gain is achieved over 4.8GHz bandwidth. The measured cros...

This paper presents the design of an ultra-wide band (UWB) circular patch antenna with microstrip line feed and optimization of various antenna parameters. The antenna with dimension of (33 x 30 x 1.5) mm 3 is fabricated on FR-4 epoxy substrate having permittivity constant r=4.3, loss tangent tanδ=0.002. The designed antenna has the capability of operating in the bands (2.7-4) GHz, (6.8-12.5) G...