High-performance dual passband + Namatikdan ang City Filter

High-performance dual passband + Namatikdan ang City Filter

Pagdesinyo a Dual Passband + Namatikdan ang City Filter nga naghiusa sa duha ka lapad nga mga passband nga adunay usa ka pig-ot, Ang lawom nga pagsalikway sa tunga mao ang usa sa labing gipangayo nga mga hagit sa RF engineering. Ang detalye sa kustomer naghubit sa higpit nga mga kinahanglanon alang sa bandwidth, attenuation, ug kalig-on sa kinaiyahan — tanan sulod sa usa ka compact mechanical footprint. Kini nga artikulo nagpatin-aw sa teknikal nga mga kinahanglanon, konsiderasyon sa disenyo, ug mga estratehiya sa pagpatuman alang sa pagkab-ot sa ingon nga taas nga performance sa RF filtering.

Ania ang panginahanglan sa usa ka pumapalit.

Kini usa ka L passband + notch hiniusa nga filter.
pagdumala sa gahum: dili kaayo 30 dBm.
matang sa konektor: SMA nga babaye para sa input ug out put.
sentro frequency: (960+1230)/2: 1095 MHz
frequency sa passband 1: 960 ~ 1015 MHz
frequency sa passband 2: 1045~1230 MHz
pagkawala sa pagsulod < 1 dB
ripple : +- 0.5 dB
hunong banda 1: 70 dB attenuation nga nakab-ot kalabot sa passband ripple midpoint alang sa mga frequency nga mas ubos kaysa 690 MHz
hunong banda 2: 70 Nakab-ot ang dB attenuation nga may kalabotan sa passband ripple midpoint alang sa mga frequency nga mas taas kaysa 1390 MHz
pagsumpo: 30 db attenuation nga nakab-ot kalabot sa passband ripple midpoint alang sa frequency 1028.5 sa 1031.5 MHz
Vswr: mas maayo kay sa 1.6
gidak-on: gamay kutob sa mahimo
temp: -40 ~70 degrees Celsius
kalikopan: pass salt spray test
tuning: screw
materyal: brass or aluminium
coating: oo

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1. Kinatibuk-ang Panginahanglan sa Teknikal

The target product is a dual passband cavity filter with an integrated notch, defined by the following key parameters:

• Passband 1: 960–1015 MHz
• Passband 2: 1045–1230 MHz
• Notch Band: 1028.5–1031.5 MHz, ≥30 dB attenuation
• Stopband 1: ubos 690 MHz, ≥70 dB attenuation
• Stopband 2: ibabaw 1390 MHz, ≥70 dB attenuation
• Pagkawala sa Pagsulod: <1 dB, Ripple: ± 0.5 db
• Vswr: <1.6
• Gahum pagdumala: <30 dBm
• Konektor: SMA female input/output
• Operating Temp: –40°C to +70°C
• Sa kinaiyahan: Pass salt spray test
• Tuning: Mechanical screw tuning
• Materyal nga: Brass or aluminum with protective coating
• Kadak-an: As compact as possible

These parameters demand a precision-engineered cavity structure capable of delivering both high selectivity and low loss.

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2. Panguna nga mga Hagit sa Disenyo

1. Extremely Narrow Notch (3 MHz)
   The rejection notch (1028.5–1031.5 MHz) is only 0.3% of the center frequency, requiring an exceptionally high-Q cavity resonator and accurate coupling control to ensure ≥30 dB attenuation without degrading the passbands.
2. 70 dB Stopband Rejection
   Makab-ot 70 dB suppression below 690 MHz and above 1390 MHz is a high-order filtering requirement that typically demands multi-cavity coupling or complex dual-mode structures.
3. Low Insertion Loss over Wide Passbands
   With broad passbands (960–1015 and 1045–1230 MHz), maintaining <1 dB insertion loss is difficult. High-Q cavities, low-loss plating, and precision machining are essential.
4. Miniaturization vs. Electrical Performance
   The customer’s request for minimal size directly conflicts with Q-factor and attenuation goals. Engineering tradeoffs must be made between compactness and RF performance.

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3. Girekomenda nga mga Pamaagi sa Implementasyon

A. Makina nga Multi-Cvity Filter (Gipalabi nga Solusyon)

• Bentaha: Excellent Q-factor, stable thermal performance, and precise control over notch frequency.
• Desinyo: Multi-cavity resonator with a dedicated notch cavity and mechanical screw tuning.
• Materyal: Brass or aluminum, nickel/silver plating for corrosion resistance.
• Drawbacks: Larger size and higher manufacturing cost.

B. Hybrid Dielectric-Cvity Filter

• Bentaha: Smaller size, integrates ceramic resonators for the notch.
• Drawbacks: Temperature drift and limited 70 dB stopband rejection.

C. Compact nga Microstrip Filter

• Bentaha: Minimal volume and low cost.
• Drawbacks: Limited deep rejection and higher insertion loss.

For military or UAV video transmission applications, ang machined cavity structure remains the most reliable way to achieve the required dual passband + notch performance.

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4. Mga Materyal ug Coating

To ensure corrosion resistance and compliance with the salt spray test:

• Brass: Nickel plating (optional gold plating on contacts)
• Aluminum: Hard anodized and sealed surface
• Proper sealing around SMA connectors and housing joints ensures long-term reliability.

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5. Tuning ug Temperatura Stability

Ang mechanical screw tuning allows fine adjustment of the passbands and notch. For stability under vibration and temperature changes, locking nuts or adhesive sealants are recommended.
Thermal drift is minimized by selecting low-expansion materials and tight mechanical tolerances.

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6. Pagsulay ug Pagpamatuod sa Kalidad

Before shipment or batch production, matag usa Dual Passband + Namatikdan ang City Filter should undergo comprehensive testing:

• S-Parameter (S11/S21) measurements from 300 MHz–2 GHz
• Vswr <1.6 across passbands
• Stopband attenuation verification (690 MHz and 1390 MHz)
• Salt spray and temperature cycling tests
• Power handling hangtod sa 30 dBm
• Aging and vibration stability validation

A full RF test report should accompany every prototype and production batch.

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7. Paggama ug pagkamakanunayon

• Machining tolerance: ±0.02–0.05 mm for cavity dimensions.
• Connector interface: Ensure low reflection and solid grounding.
• Batch calibration: Each filter may require individual fine-tuning due to the narrow notch bandwidth.

Initial small-batch prototyping (3–5 units) is strongly recommended before mass production.

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8. Pagsusi sa Risk ug Komunikasyon sa Kustomer

Because this Dual Passband + Namatikdan ang City Filter targets high selectivity and compact size, it’s important to clarify the customer’s top priorities:

• Is 70 dB rejection mandatory, or can it be slightly reduced?
• Is compact size more critical than <1 dB insertion loss?
• Can the notch bandwidth be widened slightly to improve manufacturability?

Confirming these factors early helps balance design complexity and production cost.

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9. Kalangkoban

Ang Dual Passband + Namatikdan ang City Filter is technically feasible but requires precision mechanical and RF engineering.
A multi-cavity design remains the best approach to achieve low insertion loss, narrow deep notch rejection, and strong environmental durability.
Close collaboration between the customer and the RF design team ensures successful prototyping and optimized production.

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FAQS

Based on buyer’s specifications, our engineering team has completed the simulation the Combline Filter and prepared the following proposed parameters for your review and confirmation:

Simulated Technical Specifications (for reference):

• Passband 1: 960–1015 MHz
• Passband 2: 1045–1230 MHz
• Pagkawala sa Pagsulod: ≤1.5 dB (≤1.0 dB at center frequency)
• Passband Ripple: ≤±0.5 dB
• Vswr: ≤1.36
• Pagsalikway sa Band-of-band: ≥70 dB @ 690 MHz–DC; ≥70 dB @ 1390–3000 MHz
• Suppression Between Passbands: ≥30 dB @ 1028.5 MHz; ≥30 dB @ 1031.5 MHz
• Mapakyas: 50 Ω
• Type sa Konektor: SMA-Female
• Operating Temperatura: –40°C to +65°C
• Salt Spray Protection: Three-proof coating on the housing surface
• Simulated Size (for reference): 112 × 54 × 36 mm (TBD)

Anang RF comb filter is a type of radio frequency (RF) filter whose frequency response looks like the teeth of a comb — it has a series of equally spaced passbands or stopbands across the frequency spectrum.

Ania ang usa ka pagbungkag:

• Kalihokan:
  Kini nagtugot (or rejects) signals at specific, regularly spaced frequencies.
• Working principle:
  The comb-like pattern is achieved through signal delay and interference (in digital or analog domains) or through resonant structures (in microwave/RF hardware).
• Types:
  • Band-pass comb filter: Passes multiple narrow bands at regular intervals.
  • Band-stop (notch) comb filter: Rejects multiple narrow bands at regular intervals.
• Mga aplikasyon:
  • RF and microwave systems for channel selection or interference rejection
  • Frequency synthesizers and spectrum analyzers
  • Optical and acoustic signal processing
  • Multi-carrier communication systems

Pananglitan:

A 1 GHz RF comb filter may pass signals at 1 Ghz, 2 Ghz, 3 Ghz, ug uban pa., while attenuating others in between.