in this paper, a resonant slotted waveguide array antenna with circular boundary has been designed and simulated for mono-pulse airborne radar applications. the antenna parameters are:11% bandwidth in x-band (8.6-9.6ghz),vswr < 2, 38dbi directivity, sidelobes level of - 20db and 3-db beam-widths of 2.1degree. to design this antenna, it is divided into short sections (sub-arrays) each with a uni...

this paper presents the results of a study on the radiation characteristics of a plasma triangular antenna in the vhf band (30-300mhz) applying the method of moment. deriving the current distribution of the antenna, it shows the relationship between radiation characteristics of the plasma antenna and the plasma parameters. both theoretical and numerical results indicate that if the plasma frequ...

In this paper, we employ multiple wireless-powered relays to assist information transmission from a multi-antenna access point single-antenna receiver. The wireless can operate in either the passive mode via backscatter communications or active RF communications, depending on their channel conditions and energy states. We aim maximize overall throughput by jointly optimizing transmit beamformin...

This work presents a ${D}$ -band monostatic radar system operating from 144.6 to 161 GHz, which is placed inside 3-D-printed low-cost case with built-in lens boost the antenna (ANT) directivity. The monolithic microwave integrated cir...

This paper presents an ultra-wideband multibeam antenna with eight radiating elements that are connected to the central cylindrical part. Each element consists of a TEM horn fed by coaxial ridged planar waveguide transition. The connection between and part equivalently acts as biconical antenna. behavior is guaranteed wideband properties adapter. Comprehensive optimization performed minimize re...

This article proposes a wideband differentially fed dual-polarized magnetoelectric (ME) dipole for millimeter-wave (mm-Wave) applications. Various electric and magnetic characteristic modes of slotted patch antenna are investigated utilized effectively to create stable broadside radiation pattern, covering fifth-generation (5G) frequency bands from 24.25 40 GHz. To implement this, the lifted gr...

This article presents a wideband dual-circular-polarization (dual-CP) antenna with high port isolation based on grooved-wall CP horn combined an orthomode transducer (OMT) in the W-band. A pair of grooves inner wall serves as inbuilt polarizer within antenna, which is capable generating both left-hand circular polarization (LHCP) and right-hand (RHCP) without any septum. The continuous linearly...

To suppress the coupling among patch antenna arrays and reduce out-of-band spurious, a feeding-decoupling network with harmonic suppression is proposed. The decoupling method achieved by generating two paths between feeding of an radiating adjacent antenna, through slotline-based lowpass filter miniaturized coupled line coupler. Despite no operation non-adjacent elements, them also reduced. are...

In this paper a particle swarm optimization (PSO) algorithm is presented to design a compact stepped triangle shape antenna in order to obtain the proper UWB bandwidth as defined by FCC. By changing the various cavity dimensions of the antenna, data to develop PSO program in MATLAB is achieved. The results obtained from the PSO algorithm are applied to the antenna design to fine-tune the bandwi...