Short leaky-wave antennas of sum and differencepatterns

Lin, Jiunn-Yuan; Tzuang, C.-K.C.; Chou, Guang-Jong; Su, S.

doi:10.1049/el:19960866

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…The design of a broadband feeding structure is also essential to exploit fully the broadband feature of a tapered microstrip leaky-wave antenna. Some typical feeding structures for exciting the first higher order mode of a microstrip leaky-wave antenna include unsymmetrical microstrip line [2], microstrip-to-slotline [15], coplanar waveguide (CPW)-to-slotline [9], coaxial-to-microstrip [16], aperture-coupled [17], and microstrip-to-coplanar strips (CPS) [18]. The bandwidth of these feeding structures is not sufficiently wide (less than or around about 20%) for broadband applications.…”

Section: Introductionmentioning

confidence: 99%

Broadband tapered microstrip leaky-wave antenna

Hong

Chen

Chang

et al. 2003

IEEE Trans. Antennas Propagat.

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This study proposes a novel scheme based on the characteristics of leaky-wave antennas for the empirical design of broadband tapered microstrip leaky-wave antennas. This scheme can explain and approximately model the radiation characteristics of a linearly tapered leaky-wave microstrip antenna. A broadband feeding structure that uses the balanced and the inverted balanced microstrip lines to form a pair of broadband baluns is also presented. The measured return loss of the inverted balanced microstrip lines has a VSWR 2 from dc to 18.6 GHz and that of the back-to-back feeding structures has a VSWR 2 from 2.2 to 18.6 GHz. This feeding structure can be used to feed a broadband planar leaky-wave antenna with a fixed mainbeam that uses the tapered microstrip structure. The measured bandwidth of the antenna for a VSWR 2 exceeds 2.3:1.

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Section: Introductionmentioning

confidence: 99%

Broadband tapered microstrip leaky-wave antenna

Hong

Chen

Chang

et al. 2003

IEEE Trans. Antennas Propagat.

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“…Microstrip-to-slotline [11], coplanar waveguide (CPW)-to-slotline [12] and coupling-aperture [13] can ideally excite a pure odd (EH 1 ) mode, but they also produce unwanted radiation in the lower half-space. Feeding techniques with an additional out-phase network or balun were also proposed to efficiently suppress the excitation of the fundamental mode, such as coaxial-to-microstrip [14], microstrip-to-coplanar strips (CPS) [15] and inverted balanced microstrip lines [16]. However, the adoption of an addition network or balun increases complexity in design and requires extra space for the feeding structure.…”

mentioning

confidence: 99%

Design of Periodic Shorting-Vias for Suppressing the Fundamental Mode in Microstrip Leaky-Wave Antennas

Liu

Long

2015

IEEE Trans. Antennas Propagat.

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The design of periodic shorting-vias for suppressing the fundamental mode in microstrip leaky-wave antennas is studied in this paper. When a microstrip leaky-wave antenna is loaded with periodic shorting-vias along the centerline, the fundamental mode has a stop band in which the mode is strongly attenuated. The stop band is investigated to best match the (leaky-wave) antenna-mode region of the first higher mode. An approximate formula is derived to estimate the start of the stop band. When the fundamental mode is suppressed in the required band, a microstrip leaky-wave antenna can be efficiently fed with a simple asymmetrical feeding structure and no additional out-phase network is needed. A microstrip leaky-wave antenna fed by a coaxial probe and another one fed by a microstrip line are demonstrated. With the proper design of shorting-vias for suppressing the fundamental mode, excellent performances of the microstrip leaky-wave antennas are achieved.Index Terms-Microstrip leaky-wave antenna, shorting-vias, periodic structure, stop band, fundamental mode.

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“…And the width W and length L of the LWA are empirically chosen to be 1.11 cm (433 mil) and 6.096 cm (2400 mil), respectively. We employed a rigorous (Wiener-Hopf) solution [5] to find the normalized complex propagation constantp/kojcc/ko of the first higher order mode, where P/ko is the normalized phase constant andc/ko is the normalized attenuation constant. The variations off/ko andc/ko with frequency are plotted in Figure 2.…”

Section: Design Of the Multi-beam Scanning Lwa And Vcomentioning

confidence: 99%

“…This active leaky-wave antenna is designed to achieve the difference modes with two-beam radiation pattern or the sum modes with three-beam radiation pattern in the elevation plane. Because the signal is fed from the center of the open end of each LWAs, the power combining effect of the sum (E) and difference (A) patterns [5]- [6] of the millimeterwave can be produced.…”

Section: Introductionmentioning

confidence: 99%

An Novel L-shape Active Leakly-Wave Antenna with power combining and scanning capability

Chen¹,

Wang²,

Jou³

2005 Asia-Pacific Microwave Conference Proceedings

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In this paper, an active-integrated leaky-wave antenna with power combining scanning capability is presented. This leaky-wave antenna with the novel perpendicular L-shape topology is integrated with a varactor-tuned high-electron mobility transistor (HEMT) voltage controlled oscillator (VCO) on the same plane. Changing the VCO frequency, we can control not only the dual-beam scanning angle but also derive the power combining effect with the sum (L) or difference (A) radiation patterns. The power combing effect of difference mode, which is the dual-beam pattern and the sum mode pattern, which is a 3-beam pattern, with the 3rd beam located along the middle direction (450, 1350) of the X and Y axes. The measured scanning angle is steered over a range of 24-460 for the right beam and 127-1480 for the left beam. Compared with single microstrip leaky-wave antenna, the L-shape LWAs configuration has the advantages of switchable radiation patterns as the VCO varied from 10GHz to 10.6GHz.

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Short leaky-wave antennas of sum and differencepatterns

Cited by 7 publications

References 1 publication

Broadband tapered microstrip leaky-wave antenna

Broadband tapered microstrip leaky-wave antenna

Design of Periodic Shorting-Vias for Suppressing the Fundamental Mode in Microstrip Leaky-Wave Antennas

An Novel L-shape Active Leakly-Wave Antenna with power combining and scanning capability

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