Corporate Feed Structure Research Articles

Design and Analysis of Figure Eight Shaped Slot Antenna Array for Wideband Applications

An eight shaped annular ring slot antenna array is presented. Feed is designed with T shaped Power divider and quarterwave transformer is used. Antenna element is comprised of two linked annular slots to achieve high band width. Analysis is carried out with HFSS simulation software. Array is configured with corporate feed structure. It has been observed tha gain is increased to 4dB to 5dB and return loss band width increased from 600 MHz to 1.2 GHz around 55%, Cross polarization level also significantly decreased,

Integrated multichannel Young’s interferometer sensor based on long-range surface plasmon waveguides

Two integrated Young's interferometer (YI) sensors based on long-range surface plasmon polariton (LRSPP) waveguides are presented. The first sensor is single-channel and based on a Y-junction splitter, and the other is multi-channel and based on a corporate feed structure. The multichannel YI enables simultaneous and independent phase-based monitoring of refractive index changes in multiple channels. The diverging output beams from the waveguides are overlapped in the far field to form interference patterns which are then post-processed using the fast Fourier transform (FFT) algorithm to extract phase values. The sensing capability of these YIs was demonstrated through sequential injection of solutions with increasing refractive index into the sensing channels. A detection limit of ∼ 1 × 10-6 RIU was obtained for both LRSPP based YIs, a significant improvement over measurements from similar structures using attenuation-based sensing.

1×4 Dielectric Resonator Antenna Array with Corporate Feed for C-Band RADAR

A four element 1×4 dielectric resonator antenna array with corporate feed structure has been designed and investigated in this paper. microstrip feed has been used to power the corporate feed structure. Proposed antenna radiates at the C-band frequency of 6.5GHz which is widely used for the RADAR applications. For the design of corporate feed equal split Wilkinson power divider concept is been used. Arlon material has been used as base to the antenna which is having a thickness of 0.79mm. Proposed antenna is having a gain of 12dB. From the return loss and smith chart plots we can observed the impedance matching characteristics of the antenna array. A beam width of 250 is obtained with a SLL of 15dB which is best acceptable for array applications.

4G/5G antenna system with dual function planar connected array

An integrated design consisting of a multiple-input-multiple-output (MIMO) antenna system for fourth generation applications and a planar connected array (PCA) for fifth generation applications is presented. The proposed design contains a 4-element printed-inverted-F antenna-based MIMO antenna system and a slot-based PCA. The antenna system is fabricated on a commercially available RO-4350 substrate with er equal to 3.5. The dimensions of the board are 100 × 60 × 0.76 mm 3 representing a typical smart phone backplane size. The antenna system covers 2.1 and 12.5 GHz frequency bands via its MIMO and PCA parts, respectively. The design is planar, low profile and compact in structure that is suitable for wireless handheld devices and mobile terminals. The PCA also serves as a defected ground structure at 2.1 GHz thus having two functions. Isolation is improved by at least 4 dB. The PCA consists of a 4 × 3 radiating slots fed via a corporate feed structure. The measured gain and efficiency values at the centre frequency are at least 3.4 dBi and 74%, respectively, for the MIMO antenna system and 8 dBi and 80% for the PCA. The envelope correlation coefficient did not exceed 0.2824 for all antennas showing good MIMO performance.

High-Gain SIW Cavity-Backed Array Antenna With Wideband and Low Sidelobe Characteristics

A 16 ×16 gain-high substrate integrated waveguide (SIW) cavity-backed slot array antenna with wideband and low sidelobe level (SLL) characteristics is proposed in this letter. The array is fed by an 8 ×8 SIW corporate-feed network in the bottom layer. A series of 2 ×2 compact SIW sub-arrays are employed as radiating elements in the top layer. The 45 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> linearly polarized technique is used in the design of radiating slots, which can substantially suppress the SLL of the array. Meanwhile, benefiting by the broadband merit of the sub-array and the corporate-feed structure, the proposed array has a broad bandwidth. A prototype is fabricated to verify the array properties. The measured bandwidth is 12% from 19 GHz to 21.5 GHz and the maximal gain can reach up to 29 dBi. Besides, the low sidelobe characteristic is achieved and the measured first SLLs are below -24 dB across the entire work band.

Antennafier Arrays for Electronic Beam Control

Integration of antennas with circuits can provide sophisticated receiving performance, with fewer parts and an accompanying savings in size, weight, and cost more easily than conventional separate design. This is illustrated by the beam shaping capability of a four element array of controllable-gain transistorized dipole antennafiers using an equal-amplitude corporate feed structure. Effective amplitude taper was obtained by individual gain adjustments in the integrated elements. Patterns and noise temperatures are given for various amplitude distributions, including uniform, edge, binomial, and Dolph-Chebyshev. The antennafier element used was a gamma-matched half-wave dipole integrated with a 2Nl 742 VHF transistor amplifier. Adjustable base bias was used for gain control. Up to 12 db circuit gain was obtainable in each element with an effective noise temperature under 400°K at 148 Mc.