Technical memorandum: Simple design formulas for circularly polarised microstrip antennas

Lo, Y. T.; Engst, B.; Lee, R.Q.

doi:10.1049/ip-h-2.1988.0044

Cited by 26 publications

(7 citation statements)

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“…Coaxial probe fed method was preferred due to easiness of production and impedance matching. In nearly square approach, probe can be inserted from a region such that possible locations were extracted in work [5].…”

Section: A Circularly Polarized Nearly Square Patch Antenna Designmentioning

confidence: 99%

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Interference suppression in a GPS receiver with 4 element array design and implementation of beamforming algorithms

Dabak

Erdem

Sönmez

et al. 2016

2016 IEEE/ION Position, Location and Navigation Symposium (PLANS)

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Global Positioning System (GPS) jammers add excessive noise to the received low power GPS signals and have capability to either weaken or completely destroy the positioning performance of GPS receivers for both civilian and military users. Researchers are actively working to develop GPS receiver systems resistant to interference sources. Our aim is to develop a system based on spatial filtering of jamming signals through the use of an active antenna array which is capable to control its radiation pattern by utilizing signal processing techniques. Array radiation pattern is controlled to maximize gain in satellite directions and to create null regions toward jammers. Adaptive beamforming methods provide necessary weighting coefficients to form desired radiation patterns using received data. In this paper, design, production and tests of an active antenna array is presented with implementation of adaptive beamforming algorithms using commercially available development boards.

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Section: A Circularly Polarized Nearly Square Patch Antenna Designmentioning

confidence: 99%

“…After determining the Q value by using the impedance bandwidth obtained from the simulation results, length and width of the nearly square patch antenna can be estimated by using the following relation given in [5].…”

Section: ) Design Proceduresmentioning

confidence: 99%

Interference suppression in a GPS receiver with 4 element array design and implementation of beamforming algorithms

Dabak

Erdem

Sönmez

et al. 2016

2016 IEEE/ION Position, Location and Navigation Symposium (PLANS)

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“…Therefore, slot 1 can be placed anywhere on the x = x; line; likewise slot 2 on the y = y; line. Substituting (1) into (8a) and solving for A result in the relation [8] where lAll and lAlz are positive numbers corresponding to two different frequencies of the CP operation. It is obvious from (8b) that A takes only negative values over the domain of xi( E [0, a ] ) and y;( E [0, b]), which means that only RHCP operation is possible.…”

Section: Theorymentioning

confidence: 99%

Double‐slot‐fed microstrip antennas for circular polarization operation

Aksun

Wang

Chuang

et al. 1989

Micro & Optical Tech Letters

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Using the cavity model theory, simple design formulas are developed for double‐slot‐fed circularly polarized microstrip antennas. Equivalent magnetic current sources are assumed at the slot positions and then the electric field distribution under the patch is obtained in terms of cavity modes. By applying the circular polarization conditions to the far‐field components of the electric field, the loci of the positions of the slots for the circular polarization operations are found. Experimental results are successfully demonstrated based on the theoretical designs.

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“…To date, the single-fed circularly polarised rectangular microstrip antenna (CPRMA) is not considered to be a viable option, even though extensive work has been conducted on this type of antenna [11][12][13][14][15][16][17][18][19][20]. This is because no design strategy exists that allows either a determination to be made beforehand whether circular polarisation (CP) is realisable for a certain input impedance or enables the calculation of the antenna dimensions and probe position for an arbitrary selectable input impedance (without disturbing the CP characteristics).…”

Section: Introductionmentioning

confidence: 99%

Circularly polarised rectangular microstrip antenna design with arbitrary input impedance

Mona¹,

Sakomura²,

Nascimento³

2018

IET Microwaves, Antennas & Propagation

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This study describes two stand‐alone iterative algorithms that fully solve the issue of generating non‐standard input impedances in probe‐fed circularly polarised rectangular microstrip antennas (CPRMA). Both were derived from a new cavity model‐based methodology that controls, at the frequency of operation (fnormalo), the input reactance and resistance levels without disturbing the circular polarisation (CP) characteristics of the antenna. The first algorithm finds the antenna dimensions and probe position for an arbitrarily selectable input impedance and the second algorithm determines the possible choices of input impedance for a given dielectric substrate and fnormalo. To highlight the applicability of both algorithms, two prototypes were designed and built: a right‐hand CP (RHCP) active antenna with input impedance ZnormalA=34.17+40.34iΩ, and an RHCP reference antenna (RA) with input impedance ZRA=50+0iΩ. These antennas were utilised in the design and characterisation of a co‐designed global positioning system active integrated antenna. The experimental and theoretical results show excellent agreement.

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Technical memorandum: Simple design formulas for circularly polarised microstrip antennas

Cited by 26 publications

References 0 publications

Interference suppression in a GPS receiver with 4 element array design and implementation of beamforming algorithms

Interference suppression in a GPS receiver with 4 element array design and implementation of beamforming algorithms

Double‐slot‐fed microstrip antennas for circular polarization operation

Circularly polarised rectangular microstrip antenna design with arbitrary input impedance

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