Variable impedance devices (e.g., series resonant circuits and/or transmission line tuning stubs) are connected to predetermined locations on a microstrip radiator patch for changing the effective resonant dimensions of the antenna as a … US5905465A - Antenna system - Google Patents For example, a screw can be placed through clearance holes in the upper ground plane 46, the upper and lower flanges 62a, 62b of the mode suppressor 58, and the lower ground plane 48 and secured with a fastener on the lower side. US6211824B1 - Microstrip patch antenna - Google Patents An integrated directional patch antenna uses multiple patch radiating elements to control the direction of a beam of radio frequency energy (RF) over a large scan volume. The antenna includes a ground plane element and a first dielectric … US7276990B2 - Single-pole multi-throw switch having low…
Triple-slot phase-shifting cell loaded with one variable…
Reflectarray element using variable ring with slot on ... A novel structure using a variable microstrip ring with a slot ring on part of the ground plane is proposed as an auxiliary unit cell in a reflectarray. A progressive phase range larger than 682deg has been achieved by changing the sizes of the microstrip rings and adding slot rings on part of the ground plane. A K-band reflectarray has been fabricated and shows very good performance. US6774851B1 - Antenna with variable phase shift - Google ... The present invention relates to a reflectarray antenna. The reflectarray antenna comprises a dielectric substrate layer disposed on a ground plane. An array of radiating elements such as microstrip patches of similar size are arranged into a regular lattice configuration on the top surface of the substrate layer. A periodic configuration of slots of variable size are provided at the bottom ... Design and Analysis of Microstrip Reflectarray Antenna ... There are a few kinds of phase compensation methods available for the fixed-beam reflectarray such as using open-circuited stubs [4], variable patch size [5], slot-loaded ground plane [6], slot-loaded patch [7] and the usage of electronic components [8]. Stubs produce some dissipative losses as well as spurious radiation when it is being bent.
US6388631B1 - Reconfigurable interleaved phased array antenna…
A Ku-band reflectarray using variable rings and slots on ... A unit cell composed of a microstrip ring and a slot on the ground plane is presented. The phase response range of the unit cell at 18 GHz is over 440° with a smooth phase variation. A Ku band reflectarray is designed and measured at 18 GHz to verify its performance. The maximum gain and half-power beam width is 31.7 dB and 4.7°, respectively. Design and Implementation of Reconfigurable Reflectarray ... Various reflectarray element designs were considered which included variable size patches, patch with variable length slot, patch with fixed slot fed by variable length stripline. After careful study and systematic evaluation, it was decided that the element – patch with variable length slot in the ground plane was best suited Dual Sized Varying Slot Lengths Loading Dielectric ... A DRA reflectarray with variable slot loading length supported on dielectric substrate with conducting ground plane is constructed as shown in Figure 1. The unit cell consists of rectangular DRA, with length L, width W, height H, a slot in the ground plane, with length L s and width W s, a dielectric layer of thickness h, and a conducting ... Reflectarray Antennas: Analysis and Synthesis Techniques ...
There are a few kinds of phase compensation methods available for the fixed-beam reflectarray such as using open-circuited stubs [5], variable patch size [6], slot-loaded ground plane [7], slot-loaded patch [8] and the usage of electronic components [9].
PERFORMANCE IMPROVEMENT OF REFLECTARRAYS BASED ON ... progressive phase distribution using fixed patch size with variable slot ..... 15] which proposed the slots in the ground plane demonstrated a simulated static ... A Subreflector Wavefront Controller Reconfigurable Patch-Slot Reflectarray Elements using RF MEMS Switches: A Subreflector ... Reflectarray element: Variable slot on the ground plane. Different ... TRANSMISSION LINE ANALYSIS OF APERTURE ... - CiteSeerX multilayer reflectarrays with variable size elements [5,6], reflectarrays based on .... length W. The slot in the ground plane is represented by an admittance.
Slotted Tunable Reflectarray Antenna - core.ac.uk
frequency with variable radius of slots is due to the. Malaysian Technical Universities International Conference on Engineering & Technology (MUiCET 2011).[8] M. R. Chahinir, J. Shaker, M. Cuhai and A. Sebalc, "Reflectarray With Vaiiable Slots on Ground Plane", IEE Proc.-Microwaves... World Academy of Science, Engineering and Technology Moreover different slot embedded patch element configurations have been proposed for LC based tunable reflectarray antenna design with enhanced[6] M. R. Chahmir, J. Shaker, M. Cuhai, and A. Sebak, "Reflectarray with Variable Slots on Ground Plane”, IEE Proc.-Microwaves, Antennas and... Reflective array antenna - Wikipedia Reflectarray antennas. This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188). A modern form of reflective array is the "bow tie" UHF television antenna.
US6285337B1 - Ferroelectric based method and system for… The arbitrary shaped conformal slots 203 are realized by masking selective areas on the arbitrary shaped conformal antenna slotted radiating surface 202, (the surface opposing the arbitrary shaped conformal antenna ground plane 204) of the … iWAT2014 - Detailed Program A patch antenna with the inclined three slots, two rectangular grooves on circular disc patch, the asymmetric gap of the CPW feeding structure and the truncated corner of ground plane was considered for circular polarization and broad … APS/URSI 2017 | 2017 IEEE International Symposium on Antennas… If you have not received your notification of the results by email, please contact us at papers@2017apsursi.org .