Modern small satellites (MSS) are revolutionizing the space industry. They can drastically reduce mission cost, and make access to more affordable. The relationship between a modern satellite ldquoconventionalrdquo large is similar that compact laptop work-station computer. This paper gives an overview of antenna technologies for applications in satellites. First, introduction their structures presented. followed by description technical challenges designs satellites, interactions Specific...

A dual-band, Tx/Rx, self-diplexing phased array is presented. The antenna has been designed to cover Tx/Rx satellite communications at K/Ka band with a frequency ratio 1.5:1. To obtain dual-band operations single radiating surface, novel radiator adopted and placed in configuration which single-band elements are interleaved. proposed reduces the number of required by other solutions while avoiding insurgence grating lobes. tightly packed arrangement poses many integration issues, solved...

Satellite, fifth generation (5G), and sixth (6G) mobile communication systems operating at micro- millimeter wave frequencies are an essential pillar in advanced network architectures for high-throughput low latency services. The decisive factors this current development were the significant technological advances accomplished over last two decades, which meanwhile enable highly integrated, feature-rich, cost-effective realizations of complete phased array transceiver topologies. Motivated...

The development of a circularly-polarized compact high-gain antenna to be used for the European Student Earth Orbiter small satellite mission is described. realized stacking two coaxial shorted annular patches and placing top one at half wavelength from lower one. At variance other similar configurations proposed in past, presented this paper has several important features which can extremely useful application space environment. In particular, it easily fabricated employing suspended...

This paper presents a study on reconfigurable transmit-array (TA) antennas based multilayer tunable elements. The proposed configuration can be referred to as antenna–filter antenna (MAFA) and it viewed an extension of the antenna-filter concept. It consists multiple layers cascaded form spatially distributed bandpass filter. Phase agility is achieved by tuning resonant frequency each layer. main objective this introduce new design technique for MAFA TA antennas. As will shown, key feature...

A polarization rotator based on substrate integrated waveguide (SIW) is proposed in this article. The designed as a dual-band, single-layer, frequency-selective surface (FSS) that transmits wave rotated of 90° with respect to the incident one two bands maintaining unchanged other one. Other than design and characterization rotator, its application linear-to-circular dual-band polarizer also investigated. To purpose, coupled conventional meander line generating orthogonal circular...

The application of varactor diodes as phase-shifting devices in reflectarrays has received considerable attention because it represents a low-cost and low-complexity solution for the creation scanning antennas with continuous phase tuning. main issues related to design varactor-loaded are difficulty correct characterization unit cell, limited range achievable by changing polarization voltage device. contribution presented this communication attempts cover both these aspects. In particular,...

The first millimeter-wave system-on-chip for dual-band phased array applications is presented as a proof of concept K-/Ka-band (20/30 GHz) satellite communication on-the-move applications. Each chip includes four transmit (Tx) and two receive (Rx) channels working at Kaand K-band, respectively. proposed architecture enables half-duplex operating mode in different bands. Its development was driven taking into account the integration realistic Tx/Rx shared aperture architecture. Full amplitude...

This paper presents a digital beamforming (DBF) synthetic aperture radar (SAR) for future spaceborne earth observation systems. The objective of the DBF-SAR system is to achieve low cost, lightweight, low-power consumption, and dual-band (X/Ka) dual-polarized module next-generation SAR in Europe. architectures modules proposed are designed according realistic mission scenario, which compatible with small/microsatellites platforms. fills an important gap conception DBF-SAR, facilitating high...

A new configuration of a planar grid array antenna for automotive radar applications operating in the 77-81 GHz frequency band is introduced. The proposed based on miniaturized loop elements, which are designed to maintain mutual interelement distance along azimuthal plane less than half free-space wavelength, thus allowing better scanning performance final system. Moreover, enhance gain bandwidth performance, adopts multiresonant cells realized using variably dimensioned radiation elements....

An L1 Global Positioning System (GPS) antenna with improved multipath-rejection capability is presented. The realized a shorted annular elliptical patch (SAEP). Some of the characteristics SAEP are presented briefly and detailed account design given. Measured results discussed.

A new approach for beam steering in reflectarray applications is introduced this paper. The progressive phase distribution achieved by loading each microstrip patch element with a varactor diode on the radiating edge. In following, scattering characteristics of single loaded antenna will be presented. As proof concept, capability five elements linear has been experimentally investigated.

Two dual-polarised reflectarray unit cells for the folded and one linearly polarized array element direct radiating Ka-band SatCom on move are presented in this paper. All of these antenna have multi-layered structure designed smart with beams that can be steered to large scanning angles. The operate at 29.5-30.8GHz band both transmitting receiving while is a dual operation: 19.7-21.0GHz receiving. These three elements low profile simulation results show they exhibit good radiation...

An optimization of a Stepped-Frequency Continuous Wave (SFCW) radar for contactless fall detection and tag-less localization is presented discussed. Wideband antennas with different topologies are investigated to solve the backscattering problem, which strongly overwhelms signal when operated on wall. Experimental evaluations real human subject indicated accurate both events target's absolute distance in typical room setting.

This paper introduces a gain enhancement technique for monolithically integrated antennas. Such devices can suffer from dips within their operating bandwidth due to standing waves arising in the die or caused by interactions with other on-chip components. In this work, it is shown how these effects be significantly mitigated parasitically coupling square Split Ring Resonators (SRR) fed antenna. The SRRs geometry and master antenna set such way that they create an additional resonance cancels...

In this work, a new dual-band dual-polarized transmitarray antenna element based on multilayer frequency selective surfaces is introduced. This novel configuration has been successfully tested for K/Ka SatCom bands and composed of single low-profile printed circuit board incorporating 5 metal layers without any vertical transitional elements. contrast to existing solutions, proposal eliminates the need interconnections, air gaps, or spacers between layers, resulting in cost-effective with an...

First results from a study on tunable frequency-selective surfaces (FSSs) used for beam-steering applications are reported. In particular, the scattering response of multilayer passband FSS based varactor-loaded rectangular slots has been investigated. Simulated and measured show that FSSs can be employed to locally control phase transmitted field with limited amplitude losses.

Even with the advances in signal processing, multipath error remains major source of high-precision global positioning system (GPS) applications. One most valid means to improve accuracy these systems is an appropriate design receiving antenna. Unfortunately, many cases, low-multipath-radiation requirements are very difficult satisfy especially when physical constraints have also be considered. As a possible solution, study on rejection performances shorted annular patch (SAP) antennas...

A dual-band reflection-mode wide-bandwidth and wide-angle scanning circular polarizer is designed. The proposed can convert linearly polarized waves into right- left-hand circularly (RHCP LHCP) in the two separate nonadjacent receiving transmitting K/Ka frequency bands. based on dual-layer dipole arrays printed both sides of a dielectric substrate separated by second from ground plane. An analytic model transmission line equivalent circuits developed. Closed-form expressions are derived to...

This letter introduces a new design for 2-D electronically steerable parasitic array radiator (ESPAR) based on 3×3 microstrip patch array. The proposed configuration enables conical beam steering by using nine radiating elements, one active U-slot antenna and eight elements. To validate the design, prototype was manufactured experimentally validated. reported results show continuous range of 75 degrees E-plane (ϕ = 0°), ranging from -45° to +30°, 74 H-plane 90°) -37° +37°, 60 D-plane 51°),...

In the past years, ESA has been considering use of Global Positioning System (GPS) as a medium-accuracy attitude sensor for low-earth-orbit missions. This paper describes design compact GPS antenna with improved multipath rejection to counteract effects spurious reflections. particular, shorted annular patch that is variant classical and its inner edge by cylindrical conducting wall proposed. It shown radiation characteristics offer possibility fulfill requirements without using an array...

In this letter, a dual-band antenna is proposed for use as an element in Tx/Rx Ka-band arrays. The consists of shorted annular patch (SAP) integrated with circular radiating waveguide. SAP fed stripline coupled through slot, while the waveguide, E-plane probe used. This letter presents design element, along simulated and measured results. It will be shown that possesses good electrical characteristics it can realized using standard printed technologies.

In this paper a radiating element to be used in millimeter wave integrated arrays is presented. The radiator based on an annular slot which grounded with vias form coaxial structure. presents good performances and it suited for array applications because avoids the excitation of surface waves parallel plate modes. Two elements operating around 20 GHz 30 will It also shown how these two can nested way dual band isolation.