Bow-tie antennas on a dielectric half-space: Theory and experiment

Compton, R.C.; McPhedran, R. C.; Popović, Zoya; Rebeiz, Gabriel M.; Tong, P. P.; Rutledge, D.B.

doi:10.1109/tap.1987.1144162

Cited by 165 publications

(73 citation statements)

References 15 publications

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“…The high-frequency rolloff is probably due to the finite carrier-lifetime or the time-constant, or a combination of both [10], where is the parasitic capacitance of the photomixer, and is the antenna impedance. The significant drop in signal level, compared to the log-periodic signal level (although the impedance in both cases should be close to the self-complementary value of 71 ), can be attributed to poor coupling efficiency due to the widely spread double-lobed radiation pattern [10], [13], worsened by the mismatch in spatial orientation, and polarization.…”

Section: Resultsmentioning

confidence: 94%

Spectral characterization of broadband THz antennas by photoconductive mixing: toward optimal antenna design

Mendis

Sydlo

Sigmund

et al. 2005

Antennas Wirel. Propag. Lett.

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Abstract-The spectral characterization of a broadband antenna using a pump-probe photomixing continuous-wave (CW) terahertz (THz) system is presented. The high dynamic range of the system, comparable to or better than that of similar pump-probe systems reported in the literature, provides an accurate means of antenna characterization. The planar antenna exhibits a log-periodic behavior at low frequencies, a bow-tie behavior at high frequencies, and a resonance characteristic in between, well in agreement with the antenna geometry. It is predicted that an improved geometry that extends the log-periodic behavior to higher frequencies would contribute significantly in enhancing the broadband performance of antenna-coupled photomixers.

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Section: Resultsmentioning

confidence: 94%

Spectral characterization of broadband THz antennas by photoconductive mixing: toward optimal antenna design

Mendis

Sydlo

Sigmund

et al. 2005

Antennas Wirel. Propag. Lett.

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“…After confirming the fact that the program reproduces the published data of a bow-tie antenna [12], the same computer program is applied to a spiral antenna on a semi-infinite dielectric material. Note that there have been few investigations of spirals on a semi-infinite dielectric material [2], even though investigations of spirals in various configurations have been made: spirals in free space [13], spirals backed by a plane reflector [14]- [17], spirals backed by a cavity [18], spirals in a triplate transmission line [19], and spirals on a dielectric substrate backed by a conducting plane reflector [11], [20].…”

Section: Introductionmentioning

confidence: 74%

“…A computer program has been written for obtaining the current distribution, input impedance, and power gain. We check the validity of the computer program by comparing the published data of a flat conducting plate bow-tie antenna [12] with those obtained by the program. Fig.…”

Section: Whenmentioning

confidence: 99%

An integral equation and its application to spiral antennas on semi-infinite dielectric materials

Nakano

Hirose

Ohshima

et al. 1998

IEEE Trans. Antennas Propagat.

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Abstract-This paper presents an integral equation that can handle wire antennas on a semi-infinite dielectric material. The integral equation is reduced to a set of linear equations by the method of moments. For efficiency, the impedance matrix element Zm;n is divided into two parts on the basis of weighted Green's function extractions. The far-zone radiation field, which is formulated using the stationary phase method, is also described. After the validity of the presented numerical techniques is checked using a bow-tie antenna, a spiral antenna is analyzed. The current distribution, radiation pattern, axial ratio, power gain, and input impedance are discussed. It is found that the radiation field inside a dielectric material is circularly polarized. As the relative permittivity of the dielectric material increases, the angle coverage over which the axial ratio is less than 3 dB becomes narrower.Index Terms-Millimeter-wave antennas, spiral antennas.

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“…Most of the radiation in the present design is directed into the substrate due to the high dielectric constant of the Indium Phosphide (InP) substrate [11]. A common solution to this problem has been to use a hemispherical lens on the backside of the substrate to collect the RF power and increase the antenna gain [12][13][14][15][16][17][18]. Instead of employing such bulky lenses, a promising alternate realisation to have most of the energy radiated away from the substrate is presented in this paper.…”

Section: Introductionmentioning

confidence: 99%

Bow-tie antenna for terahertz resonant tunnelling diode based oscillators on high dielectric constant substrate

Alharbi

Ofiare

Kgwadi

et al. 2015

2015 11th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME)

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Abstract-In this paper, a broadband bow-tie slot antenna is presented. The coplanar waveguide (CPW) fed antenna is fabricated on an InP substrate for same chip integration with the promising resonant tunnelling diode (RTD) terahertz (THz) oscillator which has the capability of room temperature operation and with relative high power. The antenna exhibits a very wide bandwidth (return loss S11 <-10 dB) around the design frequency (300 GHz). However, the radiation pattern is degraded because of the large dielectric constant of the InP substrate. A technique to overcome this problem employing a reflector ground plane underneath a thin substrate of low dielectric constant is presented. Initial simulation results of this technique are reported and experimental validation at lower frequency (17 GHz) shows the feasibility of the concept.

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Bow-tie antennas on a dielectric half-space: Theory and experiment

Cited by 165 publications

References 15 publications

Spectral characterization of broadband THz antennas by photoconductive mixing: toward optimal antenna design

Spectral characterization of broadband THz antennas by photoconductive mixing: toward optimal antenna design

An integral equation and its application to spiral antennas on semi-infinite dielectric materials

Bow-tie antenna for terahertz resonant tunnelling diode based oscillators on high dielectric constant substrate

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