Longitudinal slotted waveguide array feed networks

2018 ◽  
Vol 10 (4) ◽  
pp. 512-517 ◽  
Author(s):  
J. Soleiman Meiguni ◽  
S. Keshavarz Haddad ◽  
A. Hosseinbeig
Keyword(s):  
Double Layer ◽  
Layer Structure ◽  
Single Layer ◽  
Side Lobe ◽  
Center Frequency ◽  
Side Lobe Level ◽  
Waveguide Array ◽  
Coupling Mechanism ◽  
Feed Network ◽  
Slotted Waveguide

AbstractIn this paper, two new feed network designs for single layer and double layer slotted waveguide array antennas are presented. A microstrip to substrate integrated waveguide transition is applied to the single layer antenna. The aperture coupling mechanism is used in order to find the optimum feed network for double-layer structure and to obtain stable radiation characteristics over the frequency band. The prototypes of the proposed antennas have been fabricated and tested. The measured results were compared very well with the simulation results obtained from CST microwave studio and showed low side lobe level at the center frequency of 11.5 GHz for the low-profile 4-channel slotted waveguide arrays.

Center Feed Single Layer Slotted Waveguide Array

2006 ◽  
Vol 54 (5) ◽  
pp. 1474-1480 ◽  
Author(s):  
S. Park ◽  
Y. Tsunemitsu ◽  
J. Hirokawa ◽  
M. Ando
Keyword(s):  
Single Layer ◽  
Waveguide Array ◽  
Slotted Waveguide

Improved Frequency Responses of Saw Filters with Interdigitated Interdigital Transducers on ZnO/Diamond/Si Layered Structure

2007 ◽  
Vol 23 (3) ◽  
pp. 253-260 ◽  
Author(s):  
C.-M. Lin ◽  
T.-T. Wu ◽  
Y.-Y. Chen ◽  
T.-T. Chou
Keyword(s):  
Layered Structure ◽  
Electromechanical Coupling ◽  
Effective Permittivity ◽  
Local Maximum ◽  
Side Lobe ◽  
Center Frequency ◽  
Electromechanical Coupling Coefficient ◽  
Side Lobe Level ◽  
Pass Band ◽  
Frequency Responses

AbstractThere are many investigations on surface acoustic wave (SAW) filters with interdigitated interdigital transducers (IIDT) in the last two decades; however, the same is not true for the case of IIDT SAW filters fabricated on layered piezoelectric substrates. Therefore, the aim of this study is to explore the characteristics of the IIDT structures on layered piezoelectric media and further, to improve the frequency response of layered IIDT SAW filters with the unique dispersive properties of a layered piezoelectric structure. A method based on the effective permittivity approach, the coupling of modes (COM) model, and the H-matrix is utilized to analyze the characteristics of IIDT on the ZnO/Diamond/Si layered structure. In this study, it is shown that by optimizing the ratio of input to output IDT pairs, the side-lobe level of frequency responses on the ZnO/Diamond/Si layered structure could be suppressed, similar to that on the half-space substrate. In addition, it is also proved that the notched pass-band could be flattened out by designing the center frequency on the local maximum of the electromechanical coupling coefficient dispersion curve.

High-gain and high-efficiency single-layer slotted waveguide array for use in 22 GHz band

1996 ◽  
Vol 32 (4) ◽  
pp. 283 ◽  
Author(s):  
K. Sakakibara ◽  
J. Hirokawa ◽  
M. Ando ◽  
N. Goto
Keyword(s):  
High Efficiency ◽  
Single Layer ◽  
High Gain ◽  
Waveguide Array ◽  
Slotted Waveguide

scholarly journals Dual Layer Microstrip Refflectarray Composed of Two Stacked Arrays with Minkowski and Square Shaped Radiating Element

2012 ◽  
Vol 58 (1) ◽  
Author(s):  
M. F. Ismail ◽  
A. Wahid ◽  
M. K. A. Rahim ◽  
F. Zubir
Keyword(s):  
Single Layer ◽  
Side Lobe ◽  
Side Lobe Level ◽  
Variable Dimension ◽  
Reflection Phase ◽  
Radiating Element ◽  
Reflector Surface ◽  
Phase Range ◽  
Reflectarray Antenna ◽  
Lower Insertion Loss

A dual layer microstrip reflectarray composed of two stacked arrays with Minkowski and square patches of variable dimension is presented. The reflection phase coefficients on the reflector surface is achieved by tuning the dimensions of the patches. This technique is to broaden the bandwidth and to extend the reflection phase range compare to a conventional single layer reflectarray. From the simulation results of a unit cell composed of two stacked arrays of Minkowski and square patch showed that, 415° reflection phase range is achieved and lower insertion loss which is lower than 0.9 dB. Base on the simulated reflection phase coefficient, a dual layer microstrip reflectarray antenna with Minkowski and square radiating shape elements have been design and model using commercially available computer models of CST Microwave Studio. The reflectarray has been constructed using Taconic RF-35 substrate. From the radiation pattern at 11 GHz frequency, it shows that the HPBW of 4.7º in both plane, a side lobe level (SLL) of –17 dB and a maximum directivity of 26.1 dBi.

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