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Abstract:Over the past one decade, there is a rapid growth in development of wireless communication applications. The performance of all such wireless systems depends on the design of the antenna. Microstrip antennas are preferred for majority of their applications and advantages. This paper presents the design and simulation of circular rectangular patch microstrip antenna. The overall antenna is designed and simulated in Ansoft High Frequency Structure Simulator (HFSS) Software. The substrate used in this configuration is Rogers RT/Duroid and substrate is used with = 2.33. The proposed antenna is used for various wireless communication applications. Gain, Return loss and bandwidth are the performance parameter of the proposed antenna.

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Diffüz İdiyopatik İskelet Hiperostozu (DISH); beșinci dekattan sonra ve erkeklerde daha sık görülen, idiyopatik, ligament ve tendon yapıșma bölgelerinde ossifikasyon ile karakterize kronik bir hastalıktır. DISH'e bağlı nörolojik tablolar ise oldukça nadir olup spinal kanal stenozu ve miyelopatiyi içermektedir. Ligamentum flavum ossifkasyonuna (LFO) bağlı torakal miyelopati ve nörolojik defisit gelișimi, oldukça az görülmektedir. Kauda equina sendromu ciddi bel ağrısının ön planda olduğu iki veya tek taraflı bel bacak ağrısı, eyer tarzı perianal hipoestezi veya anestezi, alt ekstremitede ilerleyici paraplejiye kadar gidebilen kuvvet kaybı, duyu kaybı ve idrar inkontinansı ile birlikte olabilir. Bu olgu sunumunda travma öyküsü olmayan DISH'li bir hastada, T9-10 seviyesinde kalsifiye ligamentum flavumun yaptığı spinal kord basısı ve eș zamanlı L1-2 sekestre disk herniasyonunun yol açtığı kauda equina liflerinin basısına bağlı olabileceği düșünülen akut parapleji gelișiminin literatür bilgileri eșliğinde sunulması amaçlanmıștır.Anahtar Sözcükler: Parapleji, DISH, Kauda Equina Sendromu Diffuse Idiopathic Skeletal Hyperostosis (DISH); is an idiopathic chronic disease characterized by ossification in the ligament and tendon adhesion regions, which are more common in men and after fifth decade. Neurological tables attached to DISH are very rare and include spinal canal stenosis and myelopathy. The development of thoracic myelopathy and neurological deficit attached to ligamentum flavum ossification (LFO) is rarely seen. Cauda equina syndrome may be accompanied by bilateral or unilateral leg pain with severe back pain, saddle-like perianal hypoesthesia or anesthesia, loss of strength as far as progressive paraplegia on the lower extremity, loss of sensation and urinary incontinence. In this case report, acute paraplegia thought to be due to calcified ligamentum flavum at T9-10 level caused by spinal cord pressure in a patient with DISH without trauma and spontaneous L1-2 seqestration as cause of pressure of cauda equina fibers was aimed to be presented in the light of literature information.