Compact dual-band axially corrugated profiled horn for prime-focus reflector antenna

2011 ◽  
Vol 3 (4) ◽  
pp. 493-496 ◽  
Author(s):  
Ramesh Chandra Gupta ◽  
Jigar Pandya ◽  
Khagindra K. Sood ◽  
Rajeev Jyoti
Keyword(s):  
Return Loss ◽  
Reflector Antenna ◽  
Dual Band ◽  
Pencil Beam ◽  
Cross Polarization ◽  
Aperture Diameter ◽  
Frequency Bands ◽  
Compact Size ◽  
Better Than ◽  
Horn Feed

This paper reports a new compact dual-band axially corrugated profiled horn feed (DBCPH) for prime-focus reflector antenna at C-band (uplink and downlink frequency bands with bandwidth ratio of 1.6). DBPCH consists of one sinusoid profiled section and two internal axial corrugations (internal short-circuited ring slots), for obtaining a multimode horn feed. Such a blended structure is optimized over the specified frequency bands (3.68–3.70 and 5.865–5.915 GHz) to achieve various performance objectives (such as compactness, return loss, polarization purity, etc.). Measured and predicted results show that DBCPH provides better return loss >18.6 dB, low cross-polarization (better than −32 dB), and adequate edge taper at ±48° (8.5–11.7 dB) along with compact size (1.3λ aperture diameter and 0.88λ length at lower frequency). The horn would be used as a feed element for front-fed prime-focus reflector for pencil beam spacecraft antenna application.

scholarly journals A Compact SRR Loaded Dual Band Antenna with Modified Ground for Terahertz Applications

2019 ◽  
Vol 8 (4) ◽  
pp. 11422-11424
Keyword(s):  
Resonant Frequency ◽  
Return Loss ◽  
Dual Band ◽  
Frequency Bands ◽  
Triple Frequency ◽  
Dual Band Antenna ◽  
Compact Size ◽  
Terahertz Applications ◽  
Triple Band

A compact triple band MS antenna for Terahertz Applications is designed. The proposed MS antenna exhibit triple frequency bands by loading SRR with Rogers RT-6006 substrate. The designed antenna resonates at triple frequencies. The first resonant frequency is shown at 600 GHz (in between the band 650 GHz - 670 GHz) with maximum return loss of - 34.485 dB. The second resonant frequency is shown at 699 GHz (in between the band 680 GHz -710 GHz) with maximum return loss of -28 dB and third resonant frequency is shown at 757GHz (in between the band 750 GHz -775GHz) . The give MS antenna with a compact size of = 600 µm x 400 µm is simulated. The designed antenna exhibit as per required standards for Terahertz Applications.

scholarly journals Design of a Microwave Lowpass – Bandpass Filter using Deep Learning and Artificial Intelligence

2021 ◽  
Vol 3 (1) ◽  
pp. 1-16
Author(s):  
Saeed Roshani ◽  
◽  
Hossein Heshmati ◽  
Sobhan Roshani ◽  
◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Deep Learning ◽  
Insertion Loss ◽  
Dual Band ◽  
Transmission Zeros ◽  
Compact Size ◽  
Electrical Devices ◽  
Low Pass ◽  
Artificial Neural Network Ann ◽  
Better Than

In this paper, a lowpass – bandpass dual band microwave filter is designed by using deep learning and artificial intelligence. The designed filter has compact size and desirable pass bands. In the proposed filter, the resonators with Z-shaped and T-shaped lines are used to design the low pass channel, while coupling lines, stepped impedance resonators and open ended stubs are utilized to design the bandpass channel. Artificial neural network (ANN) and deep learning (DL) technique has been utilized to extract the proposed filter transfer function, so the values of the transmission zeros can be located in the desired frequency. This technique can also be used for the other electrical devices. The lowpass channel cut off frequency is 1 GHz, with better than 0.2 dB insertion loss. Also, the bandpass channel main frequency is designed at 2.4 GHz with 0.5 dB insertion loss in the passband.

scholarly journals 26 GHz phase shifters for multi-beam nolen matrix towards fifth generation (5G) technology

2019 ◽  
Vol 8 (3) ◽  
pp. 1028-1035
Author(s):  
Norhudah Seman ◽  
Nazleen Syahira Mohd Suhaimi ◽  
Tien Han Chua
Keyword(s):  
Dielectric Constant ◽  
Microstrip Line ◽  
Return Loss ◽  
Phase Shifter ◽  
Low Cost ◽  
Phase Shifters ◽  
Substrate Thickness ◽  
Fifth Generation ◽  
Compact Size ◽  
Better Than

This paper presents the designs of phase shifters for multi-beam Nolen matrix towards the fifth generation (5G) technology at 26 GHz. The low-cost, lightweight and compact size 0° and 45° loaded stubs and chamfered 90°, 135° and 180° Schiffman phase shifters are proposed at 26 GHz. An edge at a corner of the 50 Ω microstrip line Schiffman phase shifter is chamfered to reduce the excess capacitance and unwanted reflection. However, the Schiffman phase shifter topology is not relevant to be applied for the phase shifter less than 45° as it needs very small arc bending at 26 GHz. The stubs are loaded to the phase shifter in order to obtain electrical lengths, which are less than 45°. The proposed phase shifters provide return loss better than 10 dB, insertion loss of -0.97 dB and phase difference imbalance of ± 4.04° between 25.75GHz and 26.25 GHz. The Rogers RT/duroid 5880 substrate with dielectric constant of 2.2 and substrate thickness of 0.254 mm is implemented in the designs.

2.4 GHz and 5.2 GHz Frequency Bands Reconfigurable Fractal Antenna for Wearable Devices using ANN

2021 ◽  
Vol 36 (3) ◽  
pp. 354-362
Author(s):  
Sivabalan Ambigapathy ◽  
Jothilakshmi Paramasivam
Keyword(s):  
Neural Network ◽  
Patch Antenna ◽  
Return Loss ◽  
Fitness Function ◽  
Wearable Devices ◽  
Dual Band ◽  
Fractal Antenna ◽  
Frequency Bands ◽  
Fractal Pattern ◽  
High Frequency Structure Simulator

Patch antenna is being used widely in wearable and implantable devices due to its lightweight characteristics. Multi-band patch antenna designs are possible by incorporating professional naturally inspired fractal pattern generating methodologies. Automated Frequency Characteristics Analyzer (AFCA), Artificial Neural Network based Fractal Pattern Generator (AFPG) and Nitinol based Pattern Selector (NPS) functional modules are proposed in this work to design a Dual band Reconfigurable Fractal Antenna for Wearable Devices (DRFA). Producing a miniature fractal patch antenna to support famed 2.4 GHz and 5.2 GHz frequency bands with lesser than 20db return loss is the objective of this work. Numerous fractal patterns are generated with the help of AFPG and their frequency responses are analyzed by Ansys HFSS (High Frequency Structure Simulator) through AFCA module. The results are provided to the AFPG part to train the neural network with proper biasing updates. The fitness function is set to the dimension restriction of 3000 square μm with less than 20 return loss at commonly used 2.4 GHz and 5.2 GHz. The feed type and length of the patches are also fine-tuned by the proposed AFPG module.

Compact Dual-Band Bandpass Filter Using Stubs Loaded Ring Resonator

Frequenz ◽  
2016 ◽  
Vol 70 (1-2) ◽  
Author(s):  
Jin Xu
Keyword(s):  
Bandpass Filter ◽  
Ring Resonator ◽  
Design Guidelines ◽  
Second Order ◽  
Dual Band ◽  
Compact Size ◽  
Mode Method ◽  
Resonant Characteristic ◽  
Better Than ◽  
Good Agreement

AbstractThis paper presents a novel second-order dual-band bandpass filter (BPF) by using proposed stubs loaded ring resonator. The resonant behavior of proposed stubs loaded ring resonator is analyzed by even-/odd-mode method, which shows its multiple-mode resonant characteristic. Parameters sweep is done so as to give the design guidelines. As an example, a second-order dual-band BPF operating at 1.8/5.2 GHz for GSM and WLAN applications is designed, fabricated and measured. The fabricated filter has a very compact size of 0.05λg×0.15λg. Measured results also show that the proposed dual-band BPF has a better than 20 dB rejection upper stopband from 5.47 GHz to 12.56 GHz. Good agreement is shown between the simulated and measured results.

scholarly journals Design of high directional crossed dipole antenna with metallic sheets for UHF and VHF applications

2017 ◽  
Vol 7 (1.5) ◽  
pp. 42
Author(s):  
I. Govardhani ◽  
M. Venkata Narayana ◽  
A. Navya ◽  
A. Venkatesh ◽  
S. Charles Spurjeon ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Return Loss ◽  
High Gain ◽  
Dipole Antenna ◽  
Radiation Efficiency ◽  
Dual Band ◽  
Cross Polarization ◽  
Radiation Patterns ◽  
Metallic Plates

A compact dual band cross dipole antenna surrounded with metallic plates at five sides has been proposed in this article. comparative analysis has been done between the dipole and cross dipole antenna. On comparing these two antennas the proposed antenna has the high gain of 7db and radiation efficiency of 95 percent. The peak directivity of the proposed antenna is 5DB and its front to back ration is 60. The return loss, gain, radiation patterns and co polarization and cross polarization of the antenna has been observed and analysed using AN-soft HFSS v13.The proposed antenna works at the range of 0.6GHz to 1.5GHz which covers the applications like GSM, GNSS and some of the applications which covers in the range of UHF and VHF.

scholarly journals A Wideband Dual-Polarized Antenna Using Planar Quasi-Open-Sleeve Dipoles for Base Station Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Guan-xi Zhang ◽  
Li Sun ◽  
Bao-hua Sun
Keyword(s):  
Return Loss ◽  
Ground Plane ◽  
Base Station ◽  
Cross Polarization ◽  
High Frequencies ◽  
Feeding Structure ◽  
Polarization Characteristics ◽  
Dual Polarized ◽  
Dual Polarized Antenna ◽  
Better Than

A wideband dual-polarized antenna for WLAN, WiMAX, and LTE base station applications is presented in this paper. The proposed antenna consists of two pairs of orthogonal planar quasi-open-sleeve dipoles along the centerlines, a balanced feeding structure and a square ground plane. The planar quasi-open-sleeve dipole comprises a pair of bowtie-shaped planar dipoles with two parallel curve parasitic elements. The introduced parallel curve parasitic elements change the path of the current of the original bowtie-shaped planar dipoles at high frequencies and hence wideband characteristic is achieved. Two pairs of the planar quasi-open-sleeve dipoles placed orthogonally further broaden the bandwidth of the antenna with dual-polarization characteristics. The proposed antenna achieves a 10-dB return loss bandwidth from 2.32 to 4.03 GHz (53.9% bandwidth) using the planar quasi-open-sleeve dipole structures. The isolation between the two ports remains more than 32 dB in the whole bandwidth. Measured results show that the proposed antenna keeps the cross-polarization under −33 dB and the front-to-back ratio better than 15 dB in the operating band. The antenna has an area of 0.3λ  × 0.3λat 2.32 GHz making it easy to be extended to an array element.

scholarly journals Compact Full Ka-Band Waveguide Directional Coupler Based on Rectangular Aperture Array with Stairs

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 745
Author(s):  
Xida Deng ◽  
Ge Dong ◽  
Xuan Dai ◽  
Jinxiang Deng
Keyword(s):  
Directional Coupler ◽  
Return Loss ◽  
Coupling Region ◽  
Broad Bandwidth ◽  
Rectangular Aperture ◽  
Compact Size ◽  
Power Split ◽  
Rectangular Waveguides ◽  
Aperture Array ◽  
Better Than

This article presents a compact 3 dB waveguide directional coupler with full waveguide bandwidth. It consists of a pair of rectangular waveguides with stairs structures in the coupling region. The waveguides are placed parallel to each other along their broad wall, which has a rectangular aperture array. The compact size, broad bandwidth, good in-band coupling flatness, and good return loss are achieved by using the proposed structure. For verification purposes, a prototype of the proposed coupler was designed, manufactured, and measured. The experimental results show that over the full waveguide bandwidth a return loss of input port better than 17.46 dB, coupling strength varying between −2.74 dB and −3.80 dB, power-split unbalance within 0.76 dB, and an isolation better than 20.82 dB were obtained. The length of the coupling region was only 15.82 mm.

Ultra-compact self-diplexing antenna based on quarter-mode substrate integrated waveguide with high isolation

2021 ◽  
pp. 1-6
Author(s):  
Ayman A. Althuwayb
Keyword(s):  
Frequency Band ◽  
Long Term Evolution ◽  
Substrate Integrated Waveguide ◽  
Cross Polarization ◽  
Cavity Resonators ◽  
Frequency Bands ◽  
High Isolation ◽  
Term Evolution ◽  
Better Than

Abstract This article presents the design of an ultra-compact cavity-backed self-diplexing antenna with high isolation employing quarter-mode substrate integrated waveguide (QMSIW). The proposed antenna is constructed by using QMSIW, slot, and two 50Ω feed lines. Two eighth-mode cavity resonators are designed by inserting a slot on the top side of the rectangular substrate integrated waveguide to operate at 2.6 and 4.9 GHz for long-term evolution and public safety band applications, respectively. The proposed design allows to tune any frequency band independently by keeping other bands unaltered. The size of antenna is ultra-compact, due to the use of QMSIW cavity. The isolation between two ports is >35 dB. The antenna achieves 5.34 and 5.68 dBi peak gains at 2.6 and 4.9 GHz, respectively. The efficiency of the antenna is >85% at both frequency bands. The antenna provides more than 20.9 dB front-to-back-ratio and better than 21 dB separation between co-to-cross polarization levels. The designed antenna is validated through fabrication and measurement.

Design of Dual Band Antenna for WLAN Application

2014 ◽  
Vol 67 (3) ◽  
Author(s):  
M. Md. Shukor ◽  
M. Z. A. Abd. Aziz ◽  
B. H. Ahmad ◽  
M. K. Suaidi ◽  
M. A. Othman
Keyword(s):  
Frequency Response ◽  
Return Loss ◽  
Coplanar Waveguide ◽  
Dual Band ◽  
Ieee 802.11B ◽  
Resonant Frequencies ◽  
Ieee 802.11A ◽  
Frequency Bands ◽  
Dual Band Antenna

This paper presents the antenna designed with radiating structure of 3.5 for dual band applications. This antenna is designed and simulated by using CST Studio Suite software at 2.4 GHz and 5.2 GHz based on standard IEEE 802.11a (5.15 GHz-5.35 GHz) and IEEE 802.11b (2.4 GHz-2.48 GHz) frequency bands. The radiating structure 5 and 3 are designed to radiated at frequency 2.4 GHz and 5.2 GHz respectively. Then, both structures are combined to achieve dual band resonant frequencies. The techniques that have been used to achieve dual band resonant are by designing the 3.5 shaped by using planar and coplanar waveguide (CPW) structures. There are three designs of dual band antenna which are Design A, Design B and Design C. The optimum return loss for 2.4 GHz and 5.2 GHz frequency response are -16.44 dB and -18.78 dB respectively achieved by Design C. The changes on the position of radiating structure 3 will effects the frequency response, return loss and gain of the antenna.

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