Compact Microstrip Ring Branch-Line Coupler with Harmonic Suppression

Wang, J.; Ni, Jia; Zhao, Shanshan; Guo, Yong‐Xin

doi:10.1163/156939309790109216

Cited by 14 publications

(7 citation statements)

References 15 publications

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“…However, the size of conventional branch-line couplers is too large at lower frequency for practical use. Various approaches for branch-line coupler miniaturization can be found in recent research works [2][3][4][5][6][7][8]. The slow-wave structure is an effective way for size reduction.…”

Section: Introductionmentioning

confidence: 99%

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Compact Branch-Line Coupler Using Uniplanar Spiral Based CRLH-Tl

Zhang¹,

Tao²,

Zong³

et al. 2015

PIER Letters

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In this letter, a compact branch-line coupler using a new type of uniplanar composite right/left-handed transmission line (CRLH-TL) is proposed. The transmission line is obtained by etching spiral structure and series meandered capacitive gaps at both ends on the host line. With the aid of lumped element equivalent circuit model and dispersion relations, the CRLH property of the line is studied. By using the proposed structures, the 90-degree phase shift 35.35 ohm and 50 ohm transmission lines are designed for a compact branch-line coupler operating at 1 GHz. Its occupied size is only 32.5% of that of the conventional one. Its uniplanar prototype makes it very useful for wireless communication systems requiring high encapsulation quality.

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Section: Introductionmentioning

confidence: 99%

“…The slow-wave structure is an effective way for size reduction. The mechanism of the slow-wave propagation is to separately store the electric and magnetic energies as much as possible in the guided-wave media [2][3][4], which can decrease phase velocity. Using artificial transmission lines is another approach for size reduction [5,6].…”

Section: Introductionmentioning

confidence: 99%

Compact Branch-Line Coupler Using Uniplanar Spiral Based CRLH-Tl

Zhang¹,

Tao²,

Zong³

et al. 2015

PIER Letters

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“…Schottky barrier diode is famous for its low noise and high cut-off frequency, and thus the diode pair or quad is often adopted for compact balanced MMIC mixer design utilizing broadband baluns such as Lange couplers, spiral baluns [3,5], Marchand baluns and some others [9]. While in microstrip hybrid integrated mixer design, the input balun for the RF and LO could be realized by conventional 90-degree hybrid coupler and 180-degree rat-race ring [10][11][12], however restricted to low IF frequency mixer design [13].…”

Section: Introductionmentioning

confidence: 99%

Design of a Microstrip Balanced Mixer for Satellite Communication

Guo¹,

Xu²,

Qian³

et al. 2011

PIER

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Abstract-The design and measured results of a compact, low cost, low conversion loss microstrip single balanced Schottky diodes mixer is proposed. This mixer is designed for Ka-band satellite transponder simulator to convert the 30 GHz radio-frequency (RF) signal down to the 20 GHz intermediate-frequency (IF) signal with 9.8 GHz local oscillator (LO) frequency. This design takes full advantage of the frequency relationship of the RF, IF and LO, which is 3 : 2 : 1. A microstrip rat-race ring is designed at the LO frequency, which also functions as a 180-degree hybrid coupler at the RF frequency by its intrinsic multi-band characteristic. The amplitude and phase balance at both LO and RF frequency are analyzed, which guarantee the stateof-art performance of this single balanced mixer. The multi-function open/short stubs and a lowpass filter (LPF) with bonding wires across the rat-race ring are optimized to realize this low conversion loss mixer. The measured results show that the conversion loss is less than 9 dB at the IF frequency from 20.0 to 21.6 GHz, and the power of the second harmonic of LO is −45 dBm with +6.5 dBm LO drive power. The 3rd order inter-modulation products (IMD3) could be lower than −50 dBc with LO power higher than +7.8 dBm at the input RF power of −15 dBm.

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“…Therefore high-frequency effects in the guiding systems (commonly dispersion and power loss in microstrip lines and/or coplanar waveguides) are becoming a serious concern [1]. Also, microstrip technology is currently employed in a wide range of applications [2][3][4][5][6][7][8]. High-frequency effects in microstrip and stripline structures are often associated with the spurious excitation of a leaky mode (LM) as well as other constitutive components of the continuous spectrum (CS) [9][10][11][12]; although the excitation of leaky modes can also be advantageously used for the design of antennas [13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Low-Frequency Excitation of Leaky Modes in a Microstrip Line With a Top Cover

Mesa

Méndez²,

Jackson³

2011

PIER

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Abstract-This paper studies the excitation of a physical leaky mode in a covered microstrip structure at low frequencies. We calculate the current excited in the line by a delta-gap voltage source via a full wave analysis based on a mixed potential integral equation scheme. The current in the line is decomposed into its bound mode and continuous spectrum components. The bound mode component is associated with the propagation effects whereas the continuous spectrum component is associated with reactive and/or radiative effects and contains the contribution of the leaky mode. Our analysis also includes a detail study of the dispersion relations of the bound and leaky modes along with their corresponding electric fields. At low frequencies, in the covered microstrip structure with a low top cover height, we have found that the bound mode role is superseded by the leaky mode, in the sense that it is the leaky mode which partially or totally carries the signal energy. Therefore, the spurious effects associated with the excitation of a leaky mode, which usually appear at high frequencies in open 236Bernal, Mesa, and Jackson microstrip lines, appear here in the low frequency range. This effect may have very relevant practical consequences in the performance of such systems.

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Compact Microstrip Ring Branch-Line Coupler with Harmonic Suppression

Cited by 14 publications

References 15 publications

Compact Branch-Line Coupler Using Uniplanar Spiral Based CRLH-Tl

Compact Branch-Line Coupler Using Uniplanar Spiral Based CRLH-Tl

Design of a Microstrip Balanced Mixer for Satellite Communication

Low-Frequency Excitation of Leaky Modes in a Microstrip Line With a Top Cover

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