Transmission of convoluted periodic loop element with selective reflection

Teo, P. T.; Luo, X.-F.; Lee, C. K.
August 2004
Applied Physics Letters;8/30/2004, Vol. 85 Issue 9, p1454
Academic Journal
The transmission and reflectivity of electromagnetic energy across a planar layer consisting of periodic arrays of convoluted loop elements (with interelement spacing of 6.08 cm) is investigated in the lower microwave spectrum at 1.575 GHz (λ=19 cm). This relatively close spacing is achieved by convoluting the conventional 1λ square loop element at its four corners. The close interelement spacing provides a stable passband frequency response over wide angles of wave incidence, while the convoluted segment provides a short circuit response when the segment length is λ/4 long. The short circuit will provide a reflection to the electromagnetic energy at the selected band-stop frequency range. Various design considerations have been adopted to meet the challenge of ensuring a common passband bandwidth of 22.47% (1.5–1.95 GHz), with a transmission loss of less than 0.5 dB for scan angles up to 45° in both TE and TM polarization.


Related Articles

  • When is a circuit breaker not a circuit breaker? Young, John W.; Clark, Ray // EC&M Electrical Construction & Maintenance;Jan1998, Vol. 97 Issue 1, p64 

    Explains about electric circuit breakers (CB). Definition of a CB in the NEC; Supplementary protector; Distinction between CBs and supplementary protectors; Distinguishing marks.


    A quiz about protection schemes for low-voltage circuit breakers is presented.

  • Microwaves and layered double hydroxides: A smooth understanding. Benito, Patricia; Labajos, Francisco M.; Rives, Vicente // Pure & Applied Chemistry;Aug2009, Vol. 81 Issue 8, p1459 

    Microwave-hydrothermal treatment (MWHT), a modification of conventional hydro thermal treatment, has been used during post-treatment of different layered double hydroxides (LDHs). In some cases, microwaves (MWs) have been used simultaneously with urea hydrolysis or for reconstruction of the LDH...

  • Passband switchable microwave photonic multiband filter. Ge, Jia; Fok, Mable P. // Scientific Reports;11/6/2015, p15882 

    A reconfigurable microwave photonic (MWP) multiband filter with selectable and switchable passbands is proposed and experimentally demonstrated, with a maximum of 12 simultaneous passbands evenly distributed from 0 to 10 GHz. The scheme is based on the generation of tunable optical comb lines...

  • Power system circuit breakers. PAY, STEVEN L. // Consulting-Specifying Engineer;Oct2008, Vol. 44 Issue 4, p70 

    The article discusses amp-interrupting capacity of power system circuit breakers and the calculations to determine values for a power system. The article discusses three-phase power distribution systems. The interrupting capacity of a device is the "the maximum short-circuit current that a...

  • Stick Up for Your Designs. Cybart, Ken // Design News;6/7/2004, Vol. 60 Issue 8, p18 

    Focuses on the consideration of engineers for inexpensive circuit breakers or fuses. Key features of circuit breakers; Capability of circuit breakers to survive short circuit; Quality of circuit breakers.

  • Overcurrent-Protection ICs Have Their Current Limits. Mannas, Steve // Power Electronics Technology;Oct2008, Vol. 34 Issue 10, p26 

    The article discusses the features of solid-state overcurrent-protection integrated circuits (IC) which provides protection for pins at risk of overloads and short circuits. Such switches are at risk for overvoltage and even destruction if the energy stored in the stray inductance is not...

  • Digital Command Control and turnouts.  // Model Railroader;Dec2009, Vol. 76 Issue 12, p76 

    The article discusses the common sources of short circuits and ways to fix them. It mentions that most of the time, when locomotives pass over the turnouts, they usually stall or the sound decoder restarts, it is because turnouts are where short circuits usually occur.To protect one's...

  • Combo Circuit Breaker and AC Intel Are Enhanced.  // ECN: Electronic Component News;Jan2006, Vol. 50 Issue 1, p44 

    The article reports that Schurter Inc. has introduced an upgraded version of its circuit breaker and alternating current inlet combination. The DF11 and DF12 series provide a recessed switch to forestall accidental actuation. The DF12 is offered in the screw-on mounting style, while DF11 is...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics