No abstract

No abstract

No abstract

Abstract-In this paper, a technical concept and design of circular polarization detection patch array antenna using a double-balanced RF multiplier is proposed. The microwave integration technology is effectively employed to realize the proposed array antenna. The double-balanced RF multiplier is integrated with an orthogonal planar array antenna. The array antenna which consists of 12 patch elements and the RF multiplier is realized by embedding four zero bias Schottky barrier diodes on a slot-ring. The Both-sided MIC technology is successfully employed to realize the array antenna. The array antenna is realized in a very simple and compact structure as all the antenna elements, feeding circuit and the RF multiplier are integrated on both sides of a dielectric substrate. The ability of the proposed array antenna to detect the orthogonal circular polarization (LHCP and RHCP) is successfully confirmed by the experimental investigation.

A multiple-input-multiple-output (MIMO) antenna with orthogonal circular polarization (CP) is proposed in this paper with an intention to use the antenna in sub-6 GHz 5G applications. The single antenna consists of a radiating slot and feed line. The non-uniform width elliptical ring slot in the ground plane and unequal feed line technique are used to produce CP. The benefit of using ring slot antenna is that this type of antenna can radiate orthogonal CP at the front and back direction, simultaneously. The operating band of single antenna is (3.6-3.8 GHz). The MIMO antenna has 4 single antenna elements where each antenna element is surrounded by the mirrored antenna elements. As a result, MIMO structure provides orthogonal CP. Moreover, this MIMO antenna can also radiate both LHCP and RHCP on the both directions (θ = 0° and 180°) simultaneously. Three interconnected strip lines on the ground plane are designed to connect the individual grounds of the antenna elements. The MIMO antenna provides good isolation and CP gain in the whole band (3.4-3.8 GHz). The envelop correlation coefficient and channel capacity loss are evaluated to judge the MIMO performances and promising result is achieved. To analyze the impacts of user hand, various performance studies are done for the antenna in the vicinity of left hand and right hand phantom model and satisfactory results are achieved. These performances prepare the antenna more attractive to use in 5G cellular applications.