A model for calculating the radiation field of microstrip antennas

Hammer, Per; Bouchaute, D. Van; Verschraeven, D.; Capelle, Antoine Van de

doi:10.1109/tap.1979.1142054

Cited by 63 publications

(18 citation statements)

References 5 publications

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“…Aperture model [ 13] of the antennas are constructed by putting six radiating aperture slots (SI, S2, • • •, S6) along the periphery of the antenna as given in Fig. 2(c).…”

Section: Discussionmentioning

confidence: 99%

“…(St,;, Sly), (S2,;, S2y ), • • •, (So,;, Soy) are the coordinates of the center points of the slots S1, S2, •••, S6, respectively . The total far field produced can he obtained as in [13].…”

Section: Discussionmentioning

confidence: 99%

“…The total radiated power (P,.) is computed by [13] and can be used for the calculation of quality factor and gain. The predicted and measured gain of antenna A is found to be 6.04 dB and 5.86 dB, respectively.…”

Section: Discussionmentioning

confidence: 99%

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Analysis of a new compact microstrip antenna

George

Aanandan

Mohanan

et al. 1998

IEEE Trans. Antennas Propagat.

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“…Aperture model [ 13] of the antennas are constructed by putting six radiating aperture slots (SI, S2, • • •, S6) along the periphery of the antenna as given in Fig. 2(c).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Analysis of a new compact microstrip antenna

George

Aanandan

Mohanan

et al. 1998

IEEE Trans. Antennas Propagat.

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“…By means of the cascaded models, the phase and amplitude distributions of a signal can be evaluated correctly. An aperture model, derived in [53], is used for calculating the radiation field of a rectangular microstrip resonator antenna (Fig. 3.7).…”

Section: Analysis Of a Microstrip Linear Array Antennamentioning

confidence: 99%

A Novel Millimeter-Wave Dual-Fed Phased Array for Beam Steering

Topak

Hasch

Wagner³

et al. 2013

IEEE Trans. Microwave Theory Techn.

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A phased array antenna, used for shaping and steering the main antenna beam electronically to chosen directions within the predefined field of view, has been the key antenna system for satellite communications and military radars for decades. However, despite its high functional performance, it is still a very costly and complex solution for emerging wireless consumer applications such as high speed wireless communication and driving assistance systems due to the number of phase shifters and their complex control circuitry. Even more challenges are encountered with an increase in the number of channels if an antenna with high directivity is desired, such as routing RF and IF circuits, isolation of neighboring RF channels or calibration of a whole system.In order to eliminate the challenges stated above, a novel beam steering approach is presented in this dissertation based on the superposition of two squinted antenna beams. The two antenna beams are realized by exciting the opposite feeds of a dual-fed array antenna. A change in the phase difference and amplitude ratio between the input signals, using only one phase shifter and two variable gain amplifiers or only two I-Q vector modulators, steers the main beam in different directions. Due to its similar architecture, it exhibits all the advantages that a traveling wave antenna possesses as well, such as beam steering with the change of the operating frequency.Additionally, the sum and difference patterns can be obtained using this concept, allowing for an amplitude-comparison monopulse operation with a broad peak or a deep null at the broadside. Using this approach, beam nulls can also be steered towards interference directions, while keeping the shape and direction of the main beam unchanged. Another advantage is its high robustness against phase and amplitude errors due to analog hardware components in the RF path, which cannot be avoided in conventional phased arrays. A channel mismatch and crosstalk between neighbor RF channels or a temperature and time dependent array calibration can be minimized via this technique thanks to its unique topology, as well.In this work, an analytic antenna model has been derived and implemented in MATLAB using closed form expressions to analyze and optimize each relevant antenna parameter. Using this model, the development time becomes significantly shorter and the required computer memory is almost negligible.In order to prove the validity of the proposed novel beam steering approach, two different millimeter-wave (mm-wave) dual-feed antenna setups have been designed and implemented. In the first setup, commercial passive WR-10 components are used to perform the phase and i -iiamplitude changes manually. To demonstrate the full capability of electronic scanning, a second setup is built by employing an I-Q vector modulator instead of the waveguide phase shifter and the attenuator, which is controllable via input current signals. A mm-wave baredie transceiver MMIC which houses an integrated I-Q vector modulator in its ...

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“…The radiation pattern of a single resonator can be calculated using well-known aperture theory [12], if the antenna is modelled by a set of narrow radiating slots (corresponding to the edge fields) in a perfectly conducting plane [13]. The resonant aperture fields are derived from the boundary fields in a closed resonator model [13].…”

Section: Radiation Modelmentioning

confidence: 99%

Wideband quasi-log-periodic microstrip antenna

Pues¹,

Bogaers²,

Pieck³

et al. 1981

IEE Proc. H Microw. Opt. Antennas UK

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The paper describes a new design method for a wideband array of log-periodically scaled microstrip resonator antennas. The radiating elements are series-fed by a simple coplanar microstrip network. This network consists of an open-circuited feed line with a branch line connected to each radiating element. Both a network and a radiating model for the complete structure are explained. These models predict with good accuracy the input impedance and the radiation pattern as a function of frequency. The results for a 5-element 5-band antenna are presented as an illustrative example. This antenna combines a good impedance match (VSWR < 2.6) with a reasonable power gain in broadside direction (> 5.5 dB) over a 22% bandwidth. This means a tenfold increase in the bandwidth in comparison with a single microstrip resonator antenna. List of principal symbols BW C E,H >nK bandwidth capacitance of resonator electric, magnetic field dielectric constant of substrate absolute permittivity, permeability of free space frequency frequency, angular frequency, free space wavelength at resonance correction factor for surface roughness substrate thickness L, W Q.Q md D D O D P Pcu s t tan 5 x, y, z Z X / 4z m = resonator length, width = expansion factor of log-periodic structure = quality factor, radiation quality factor of resonator md = resonant, copper loss, dielectric loss, radiation resistance of resonator = reflection coefficient magnitude = copper resistivity = specified voltage standing wave ratio (VSWR) = copper thickness = loss tangent of substrate = cartesian co-ordinates = characteristic impedance of quarter-wave transformer line = input impedance of resonator 1

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A model for calculating the radiation field of microstrip antennas

Cited by 63 publications

References 5 publications

Analysis of a new compact microstrip antenna

Analysis of a new compact microstrip antenna

A Novel Millimeter-Wave Dual-Fed Phased Array for Beam Steering

Wideband quasi-log-periodic microstrip antenna

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