Plasma frequency selective surface for GNSS applications

Yigit, Olcay; Yeğin, Korkut; Akkaya, İbrahim; Öztürk, Yavuz

doi:10.1109/telfor.2017.8249369

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Since the inception of GPS, satellite navigation antenna, maybe, is one of the most studied antenna structures in the literature. It is difficult to give a comprehensive list, but microstrip patch antennas and antenna performance on the platform [1][2][3][4][5][6][7], wideband antennas [8,9], wide beam width antenna [10], miniature and multi-functional antennas [11][12][13][14][15][16][17][18], dual/triple GNSS band antennas [19][20][21][22][23][24][25], conformal and missile application antennas [26][27][28][29], array antennas for anti-jam and anti-spoofing applications [30][31][32][33][34][35], cellular phone isolation [36,37], metamaterial and plasma-supported antennas [38][39][40][41] are reported in the literature.…”

Section: Gnss Passive Antennamentioning

confidence: 99%

Antennas and Front-End in GNSS

Yeğin¹

2018

Multifunctional Operation and Application of GPS

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Antenna and front-end play a key role in global navigation satellite system (GNSS) receivers where multi-frequency and multi-constellation services are used simultaneously to produce high-precision position, navigation, and timing information. Being the first element on the receiver system, specifications on the antenna for multi-constellation GNSS applications can be challenging. Especially, integration of the antenna into the target platform, either mobile or stationary, may severely affect antenna performance. This is usually an issue for small-size antennas where measured stand-alone antenna performance in ideal conditions is usually not descriptive of actual performance on the platform. Furthermore, carrier phase tracking has become popular among algorithm developers to obtain high accuracy and anti-spoofing at the same time which demand minimal phase centre variation of the antenna within the intended GNSS band. Spoofing and jamming of GNSS receivers is a growing concern especially for aerial vehicles with ever-increasing applications of drones. These requirements demand different characteristics on the antenna and front-end than traditional applications. One of the most utilized forms of GNSS antenna is ceramic patch, due to its low height, low cost, and relatively good narrow band performance. Simulations of this particular antenna in terms of axial ratio and impedance bandwidths, axial ratio variation over elevation, and half-power beam width are carried out and discussed with comparison to its counterparts. Another critical part of the receiver is its front-end where huge amount of signal amplification with minimal distortion takes place. Long integration times (>1 ms) in GNSS signal processing also puts severe requirements on the software and temperature-compensated crystal oscillator. For mass production, the front-end should be implemented in the form of an integrated circuit. Front-end architectures from traditional superheterodyne to zero/low-intermediate frequency configurations are presented. Advantages and disadvantages of each configuration are outlined in view of multi-band and multi-standard GNSS receivers.

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Section: Gnss Passive Antennamentioning

confidence: 99%

Antennas and Front-End in GNSS

Yeğin¹

2018

Multifunctional Operation and Application of GPS

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“…Active and multifunction structures have two categories of components to steer the frequency response. Among the active components, MEMS (Micro-Electro-Mechanical System) and PIN diodes are used for switching objectives [16,17], whereas ferrite substrates [18][19][20], plasma-based traces [21], Graphene [22], liquid alloys [23] and varactor diodes [7,24,25] are used for tuning function. Frequency hopping, in communication systems, requires the filter transparency over wide range of frequencies which can also be fulfilled using tunable structures.…”

Section: Introductionmentioning

confidence: 99%

Frequency selective surface design with multifunction response for multibands

Shah,

Cao

2024

Eng. Res. Express

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The active frequency selective surface (AFSS), which can switch between five bands and has multifunctional response, is novel inclusion in the spatial filters domain. The proposed AFSS consists of double orthogonal metal Layers disposed on two sides of a substrate. This active structure adopts a four-bit scheme with embedded parallel bias lines used to feed four PIN diodes. The nine independently controllable combinations procure nine different frequency responses. The operating nine combinations switch between bands of center frequencies 1.54 GHz, 2.21 GHz, 2.94 GHz, 2.99 GHz and 3.2 GHz, which have corresponding fractional bandwidths of 18.3%, 26.6%, 12.1%, 8.4% and 1.3%, respectively. These frequencies cover the two, polarization and electromagnetic, switching functions. This multiband and multifunctional design also achieves reasonable angular stability without spurious resonance. Justification to how the proposed design works is provided through surface current distribution, electric field intensity and equivalent circuit model. The simulated multiband design is fabricated and proved its authenticity by the free space measurements scheme.

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