Design Considerations on the Minimum Size of Broadband Antennas for UWB Applications

Saitou, Akira; Aoki, Kenichi; Honjo, Kazuhiko; Watanabe, Koichi

doi:10.1109/tmtt.2007.912006

Cited by 13 publications

(8 citation statements)

References 15 publications

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“…The angle varied between 10° and 120°. To estimate the input impedance accurately, Cascade air-coplanar probes were used, and the contributions for the feed lines and measuring pads were de-embedded [8]. Thus, the extracted characteristics, shown in Fig.…”

Section: Measured Data For Input Impedance and Radiation Patternsmentioning

confidence: 99%

Analytical expression of broadband characteristics for wide-angle planar sectorial antennas

Saitou

Jin

Ishikawa

et al. 2015

2015 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)

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Analytical expression of the characteristics for wide-angle planar sectorial antennas on a substrate is derived using the mode-expansion method, where higher-order modes for the ϕ orientation are included. With only eigenfunctions for θ, the mode expansion coefficients and input impedances are numerically estimated, and the broadband characteristics are shown to be realized for wide-angle antennas. Planar sectorial antennas with varied angles were fabricated on a FR-4 substrate, and the measured input impedances and measured radiation patterns agreed fairly well with the numerical data. However, for the wide-angle antenna, the measured radiation patterns at higher frequencies were the patterns for the higher-order mode for ϕ .

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Section: Measured Data For Input Impedance and Radiation Patternsmentioning

confidence: 99%

Analytical expression of broadband characteristics for wide-angle planar sectorial antennas

Saitou

Jin

Ishikawa

et al. 2015

2015 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)

Self Cite

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“…In the UWB system miniaturization of the antenna is eagerly demanded, because the antenna is usually the largest component in the equipment. However, the minimum radius of the wideband antenna is limited to be roughly A o /21t, where A o is the wavelength in free space [2], [3]. The authors showed that the practical selfcomplementary antennas exhibit the ultra-wideband characteristics in the minimum-size Chu derived with high permittivity material (&, =10.2 ) [3].…”

Section: Introductionmentioning

confidence: 99%

“…However, the minimum radius of the wideband antenna is limited to be roughly A o /21t, where A o is the wavelength in free space [2], [3]. The authors showed that the practical selfcomplementary antennas exhibit the ultra-wideband characteristics in the minimum-size Chu derived with high permittivity material (&, =10.2 ) [3]. In addition, if antennas that are not only in the equivalent size but also are integrated on the low cost and low permittivity (& : 4 -5 ) conventional FR-4 substrate, difficulty in int~gration and mass-productivity of ultra-wideband circuits would be remarkably mitigated by integrating the antenna on the same printed circuit board accommodating UWB LSIs and peripheral circuits.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, antennas using various loop structures as shunted inductors, are investigated to realize the minimum-sized antenna on the low permittivity material. With the equivalent circuit, the lower band-edge frequency and the antenna size can be shown to be a tradeoff relation [3]. However, a shunt inductance (L s ) shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1 was utilized. With the measured return loss (-8.7 dB), the measured fractional bandwidth and the antenna radius of 10 mm, the minimum lower band-edge frequency can be calculated to be 4.4 GHz [3]. Measured lower band-edge frequency impedance-matched antenna for differential input These antennas are designed to operate in the differential mode and suppress the common mode.…”

Section: Introductionmentioning

confidence: 99%

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Miniaturized ultra-wideband self-complementary antennas using shunted spiral inductors

Saitou

Ohhashi

Honjo

et al. 2008

2008 IEEE MTT-S International Microwave Symposium Digest

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Miniaturized self-complementary wideband antennas using shunted spiral inductors are demonstrated. With ehu's equivalent circuit, a shunt inductor is shown analytically to reduce the lower band-edge frequency. With practical shunt inductors consisting of lines and spiral inductors, line-length effect on bandwidth is clarified by simulation and measurement. With the optimized spiral inductors, miniaturized 50 n impedance-matched selfcomplementary antennas were designed and fabricated on a low permittivity (& : 4.6) and low cost FR-4 substrate.Measured return loss less than -8.7 dB between 3.9 GHz and 11.2 GHz was obtained with the antenna of which radius is 10mm. Measured radiation patterns were omni-directional between 3 GHz and 9 GHz.

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Novel ultra‐wideband coplanar‐waveguide bandpass filter with inductance‐loaded Y‐shaped resonators

Song¹,

Xue²

2011

Micro & Optical Tech Letters

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the S 11 complex conjugate impedance with a suitable source inductor. This results in the wideband and low-noise figure characteristics of LNA [6]. The third and fourth stages were designed to achieve the desired gain performance of whole circuit. The DC voltages were applied by DC probe, and RF choke were demonstrated by on-chip inductors. Figure 5 depicts the die photo of the Ka-band LNA, and the total chip area including the DC and RF pads is 0.6 Â 1 mm 2 . The transmission lines on this chip were using SCS-GCPW structure for low dielectric loss consideration at Ka-band application.The noise matching stages of LNA were biased at a supply voltage of 2 V together with a power consumption of 24 mW, and the gain-matching stages were biased at a supply voltage of 1 V, together with a power consumption of 16.5 mW. Figure 6 plots the measured results of the SCS-GCPW Ka-band LNA. It achieves an 24.5-dB gain at the peak gain frequency of 33 GHz and an average N.F. of 7.3 dB from 33 to 40 GHz. Because of the negative series feedback caused by the source inductive degeneration architecture of input stage, the LNA exhibited wideband 20-dB gain from 28 to 34 GHz. From the original design frequency of 30 GHz, it achieves input and output return losses of À6 and À10 dB, respectively. For further evaluation of the dynamic range behavior of the LNAs, the input 1-dB compression point and the output third-order intercept point (OIP3) were measured. Figure 7 shows that the measured third-order intermodulation (IM3) power was only À20 dBm at P 1 dB (À2 dBm), and OIP3 was 11.2 dBm at 33 GHz. Table 1 summarized the published Ka-band LNAs inclusive of this work. The comparison indicated that the SCS-GCPW LNA demonstrated a superior gain performance together with a low-noise figure at Ka-band. CONCLUSIONSA 33-GHz high-gain and low-noise amplifier has been successfully designed and implemented in a standard 0.18-lm CMOS technology and SCS-GCPW transmission lines. Due to the semicircle ground metal architecture, the lossy substrate induced signal loss and current crowding phenomenon were suppressed. Therefore, the dielectric loss of SCS-GCPW transmission lines was reduced to 0.075 Np/m. The measured results indicated that the low loss SCS-GCPW transmission lines were beneficial for improving the gain performance and reducing the transmission line induced noise of Ka-band amplifier circuits. ACKNOWLEDGMENTSThis work is financially supported by National Science Council of Taiwan, R.O.C (NSC-97-2221-E-182-048-MY3). The chip was fabricated by TSMC through the Chip Implementation Center (CIC) of Taiwan, R.O.C. ABSTRACT: A novel ultra-wideband (UWB) coplanar waveguide (CPW) bandpass filter (BPF) with the inductance-loaded Y-shaped

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Design Considerations on the Minimum Size of Broadband Antennas for UWB Applications

Cited by 13 publications

References 15 publications

Analytical expression of broadband characteristics for wide-angle planar sectorial antennas

Analytical expression of broadband characteristics for wide-angle planar sectorial antennas

Miniaturized ultra-wideband self-complementary antennas using shunted spiral inductors

Novel ultra‐wideband coplanar‐waveguide bandpass filter with inductance‐loaded Y‐shaped resonators

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