A novel low noise active circuit replacement criteria for parallel fed large scale active antenna arrays

Date

1997-09-12

Author

Demir, S
Toker, Canan
Bizal, A

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

175
views

0
downloads

In this work noise analysis of parallel feed structures for active antenna arrays are presented. Signal and noise behaviour of the feed structures are signified by the newly introduced concepts of ''coherent'' and ''incoherent'' impedance match of power combining structures. It is also shown that a feed structure can be re-designed for low noise operation without affecting its radiation characteristics. Optimum design of parallel feed structures for low noise operation is explained. Also an optimum use of active elements in such structures is investigated to have a low overall noise temperature of the antenna array with minimum number of active elements. In the analysis a new method is introduced where a ''noise equivalent line length'' is defined. This definition which unifies the contribution of noise from different array elements, is used in the design of a parallel feed structure and as an active circuit replacement criteria in passive arrays.

URI

https://hdl.handle.net/11511/30129

DOI

https://doi.org/10.1109/euma.1997.337770

Conference Name

27th European Microwave Conference and Exhibition- Bridging the Gap Between Industry and Academia (EuMC 97)

Collections

Graduate School of Natural and Applied Sciences, Conference / Seminar

Suggestions

OpenMETU
Core

A Novel Input Impedance Computation Method for Coaxial Probe Fed Microstrip Antennas by Utilizing Characteristic Modes Cetin, Metehan; Alatan, Lale (2017-07-14) A method to efficiently compute the input impedance of the coaxial probe fed microstrip antennas by using characteristic modes is proposed in this paper. The efficiency is achieved by defining a discontinuous source current at the feed location that models the current injected by the probe. The input impedance is simply expressed in terms of modal excitation coefficients and eigenvalues of each mode.
A Novel Broadband Multilevel Fast Multipole Algorithm With Incomplete-Leaf Tree Structures for Multiscale Electromagnetic Problems Takrimi, Manouchehr; Ergül, Özgür Salih; Erturk, Vakur B. (2016-06-01) An efficient and versatile broadband multilevel fast multipole algorithm (MLFMA), which is capable of handling large multiscale electromagnetic problems with a wide dynamic range of mesh sizes, is presented. By invoking a novel concept of incomplete-leaf tree structures, where only the overcrowded boxes are divided into smaller ones for a given population threshold, versatility of using variable-sized boxes is achieved. Consequently, for geometries containing highly overmeshed local regions, the proposed me...
A Hybrid Antenna Element for Travelling Wave Dual-Plane Monopulse Slotted Waveguide Arrays Gültepe, Gökhan; Doğan, Doğanay; Aydın Çivi, Hatice Özlem (2018-12-10) A novel antenna element for low loss and low-profile dual-plane monopulse arrays is proposed. The travelling wave array has both sum and difference distributions in azimuth. The designed element is the unit cell of an interleaved slotted waveguide array feeding wideband printed antennas via probes inserted into waveguides from the slots. The use of printed antennas enhances the narrow sidelobe and efficiency bandwidth of the closely-spaced slotted waveguide arrays by up to 20%. The unit cells are modelled a...
A Distributed Fault-Tolerant Topology Control Algorithm for Heterogeneous Wireless Sensor Networks Bagci, Hakki; KÖRPEOĞLU, İBRAHİM; Yazıcı, Adnan (Institute of Electrical and Electronics Engineers (IEEE), 2015-04-01) This paper introduces a distributed fault-tolerant topology control algorithm, called the Disjoint Path Vector (DPV), for heterogeneous wireless sensor networks composed of a large number of sensor nodes with limited energy and computing capability and several supernodes with unlimited energy resources. The DPV algorithm addresses the k-degree Anycast Topology Control problem where the main objective is to assign each sensor's transmission range such that each has at least k-vertex-disjoint paths to superno...
A NOVEL CPW-FED ANTENNA WITH DUAL BAND-NOTCHED CHARECTRESTICS FOR UWB APPLICATIONS Sefidi, Mehdi; Zehforoosh, Yashar; Moradi, Shahram (2015-10-01) In this article, a coplanar waveguide fed (CPW-fed) ultra-wideband (UWB) antenna with dual band-notched characteristics is presented. Using two diamond-shaped stepped impedance resonators, two notched bands are obtained. The simulation and measurement results show that proposed antenna covers the frequency band between 2.85 and 11 GHz (118%), defined by VSWR<2. The proposed antenna has a total size 20 x 20 x 1.6 mm(3) and performed at the whole UWB with dual notched bands at WiMAX (3.4-3.6 GHz) and WLAN (5....

Citation Formats

S. Demir, C. Toker, and A. Bizal, “A novel low noise active circuit replacement criteria for parallel fed large scale active antenna arrays,” presented at the 27th European Microwave Conference and Exhibition- Bridging the Gap Between Industry and Academia (EuMC 97), JERUSALEM, ISRAEL, 1997, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30129.